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Viewing 1 to 30 of 16509
2017-10-08
Technical Paper
2017-01-2197
Vignesh Pandian Muthuramalingam, Anders Karlsson
Owing to increased interest in blended fuels for automotive applications, a great deal of understanding is sought for the behavior of multicomponent fuel sprays. This sets a new requirement on spray model since the volatility of the fuel components in a blend can vary substantially. It calls for careful solution to implement the differential evaporation process concerning thermodynamic equilibrium while maintaing a robust solution. This work presents the Volvo Stochastic Blob and Bubble (VSB2) spray model for multicomponent fuels. A direct numerical method is used to calculate the evaporation of multicomponent fuel droplets. The multicomponent fuel model is implemented into OpenFoam CFD code and the case simulated is a constant volume combustion vessel. The CFD code is applied to calculate vapor fraction of individual components in a bicomponent (n-dodecane and iso-octane) fuel.
2017-10-08
Technical Paper
2017-01-2325
Midhat Talibi, Paul Hellier, Nicos Ladommatos
The conversion of lignocellulosic biomass to liquid fuels presents an alternative to the current production of renewable fuels for IC engines from food crops. However, realising the potential for reductions in net CO2 emissions through the utilisation of, for example, waste biomass for sustainable fuel production requires that energy and resource inputs into such processes be minimised. This work therefore investigates the combustion and emission characteristics of five intermediate platform molecules potentially derived from lignocellulosic biomass: gamma-valerolactone (GVL), methyl valerate, furfuryl alcohol, furfural and 2-methyltetrahydrofuran (MTHF). The study was conducted on a naturally aspirated, water cooled, single cylinder spark-ignition engine. Each of the platform molecules were blended with reference fossil gasoline at 20 % wt/wt.
2017-10-08
Technical Paper
2017-01-2328
Yuanxu Li, Karthik Nithyanandan, Han Wu, Chia-Fon Lee, Zhi Ning
Bio-butanol has been widely investigated as a promising alternative fuel. However, the main issues preventing the industrial-scale production of butanol is its relatively low production efficiency and high cost of production. Acetone-butanol-ethanol (ABE), the intermediate product in the ABE fermentation process for producing bio-butanol, has attracted a lot of interest as an alternative fuel because it not only preserves the advantages of oxygenated fuels, but also lowers the cost of fuel recovery for individual component during fermentation. If ABE could be directly used for clean combustion, the separation costs would be eliminated which save an enormous amount of time and money in the production chain of bio-butanol.
2017-10-08
Technical Paper
2017-01-2224
Paul Freeland
REVISED ABASTRACT 4/7/2017 The challenges of maintaining continuous improvements in air quality, manage the earth’s energy resources, and to control atmospheric concentrations of greenhouse gasses, whilst supplying ever increasing global sales volumes mean that ever more detailed understanding and optimisation of powertrain systems is required. Downsizing, electrification and traffic flow management all have very important parts to play in achieving these goals, but can still only modify the outputs of the basic propulsion units, and methods to improve the efficiency, cleanliness and flexibility of powertrains remains a vital development requirement. The paper explores the fuel consumption benefits available from de-throttling technologies that can help to bring gasoline engine efficiency on a par with that of diesel engines.
2017-10-08
Technical Paper
2017-01-2268
Zhanming Chen, Long Wang, Tiancong Zhang, Qimeng Duan, Ke Zeng
Liquefied natural gas (LNG) fuelled engines have been widely equipped on heavy duty vehicles both for fuel-economic and environmental protection concerns, however, they always suffer from deteriorated combustion performance and flame stability due to relatively low burning velocity of methane for lean mixture. In this paper, experimental study was conducted on a turbo-charged, spark-ignition, lean-burn LNG engine with methanol port injection. The combustion characteristics such as cylinder pressure traces, heat release rate (HRR), mass fraction burned (MFB), ignition delay, centroid of heat release, position of CA50 and CA90, as well as cyclic variation of peak pressure were analysed under light load (BMEP=0.3876MPa) with different methanol substitution rates (MSR=0%, 5.2%, 10.2%, 17.2%). The experimental results show that combustion phase advanced with increment of MSR due to faster burning velocity of methanol.
2017-10-08
Technical Paper
2017-01-2257
Linjun Yu, Yanfei Li, Bowen Li, Hao-ye Liu, Zhi Wang, Xin He, Shi-jin Shuai
This study compares the combustion and emission performance of gasoline Homogeneous Charge Compression Ignition (HCCI) and Multiple Premixed Compression Ignition (MPCI) in a single-cylinder, intake-boosting and water-cooling diesel engine with a compression ratio of 16.7. The test fuel was commercial gasoline in China with RON of 92, and intake pressure varied from 0.16 to 0.21 MPa, while Indicated Mean Effective Pressure (IMEP) was fixed at 1.0 MPa. Both the knock limit and misfire limit of gasoline HCCI were studied. The results showed that Low Temperature Heat Release (LTHR) was observed before High Temperature Heat Release (HTHR) in gasoline HCCI, and the LTHR accounted for less than 10 percent of total heat release. The knock limit and misfire limit of gasoline HCCI coincided when the intake pressure decreased to 0.16 MPa. Increasing the intake pressure helped to promote the Indicated Thermal Efficiency (ITE) for both gasoline HCCI and MPCI.
2017-10-08
Technical Paper
2017-01-2256
Muhammad Umer Waqas, Bengt Johansson, Jean-Baptiste MASURIER, Kai Morganti
Future internal combustion engines demand higher efficiency, progression towards is limited by antiknock quality of present fuels and energy economics in octane enhancement. A possible solution is Octane-on-Demand, that uses a combination of high and low octane fuels in separated tanks to generate fuels of the required octane rating according to demand. Methanol, a RON 109 fuel was selected as the high octane fuel and five low octane fuels were used as base fuel. These were FACE (Fuels for Advanced Combustion Engines) gasolines, more specifically FACE I, J and A and their primary reference fuels (iso-octane/n-heptane). Experiments were conducted with a modified Cooperative Fuel Research (CFR) engine. For SI combustion mode the CFR operated at RON and MON conditions. The engine i.e. also operated in HCCI mode to get the auto ignition properties at lean conditions (λ=3).
2017-09-23
Technical Paper
2017-01-1990
Xiangyu huang, Hao Zhou
The most important role of V2X technology is to significantly enhance driving safety. This paper proposes an omnidirectional collision warning method based on vehicle to vehicle communication. The warnings are divided into two categories: forward collision warning (FCW) for vehicles moving in the same direction and cross collision warning (CCW) for vehicles moving in different directions. With the Basic Safety Message (BSM), the driving states of vehicles which communicate with host vehicle can be obtained. For vehicles which moves in the same direction, the lateral offset of the two vehicles, the time to collision (TTC) and time headway (THW) are used to estimate forward collision risk. For vehicles which moves in different directions, time to the closest point approach (TCPA) model and the separating axis theorem (SAT) are used for cross collision detection.
2017-09-23
Technical Paper
2017-01-2013
Zhe Xu
The rapid development of connected vehicle technology provides a promising platform for traffic monitoring and traffic data collection. In connected vehicle environment, the vehicles equipped with wireless communication devices can transmit vehicle safety messages to other connected vehicles and the Roadside Unit (RSU). The trajectory information in the safety message may provide potential usage for traffic states estimation. Over the last few years, the applications of a macroscopic traffic flow model, the Macroscopic Fundamental Diagram (MFD) has attracted increased attention. However, the detection of MFD remains a challenging task even with probe vehicle data from mobile GPS, Bluetooth, and cellphone sensors. This paper explores a potential method of observing the MFD through Vehicle-to-Infrastructure (V2I) connected vehicle data.
2017-09-23
Technical Paper
2017-01-1983
Bing Zhu, Shude Yan, Jian Zhao, Weiwen Deng, Ning Bian
Electric power steering system (EPS) is a kind of dynamic control system for vehicle steering, which can amplify the driver steering torque inputs to the vehicle to improve steering comfort and performance, but the present EPS can’t cater to the driving habits of different people. In this paper, a personalized EPS controller is designed based on the driver behavior, which combines real-time driver behavior identification strategy with personalized assistance characteristic curve. Firstly, the driver behavior data acquisition system is designed and established, based on which, the input data of different kinds of drivers along with vehicle signals are collected under typical working conditions, then the identification of driver usage modes on line is realized using the BP neural network.
2017-09-19
Technical Paper
2017-01-2138
Arun Zore, Shriraj Kale, Sangram Jadhav
The experimental study has been carried out on Compression Ignition (CI) Engine using Simarouba Methyl Ester as an alternative fuel for optimization of Performance (Specific Fuel Consumption) and Emissions (Carbon Monoxide, Oxide of Nitrogen) characteristics using Taguchi and Multiple Regression analysis. This study includes combine effect of four input parameters such as; percentage blend (FF), compression ratio (CR), fuel injection pressure (FIP) and injection timing (IT); (before TDC) for controlling the output variables such as specific fuel consumption (SFC), carbon monoxide (CO) and oxides of nitrogen (NOx). Four levels were selected to each input parameter and Taguchi’s L16 orthogonal array has been applied in present study to reduce the number of experiments. The data obtained from the experiments has been analysed using Taguchi method and Multiple regression analysis to obtain the optimum values for four input parameters.
2017-09-19
Technical Paper
2017-01-2017
Catherine Ninah, Brian Strevens, Cole Barcia, Isabelle Labbe, Michael Frenna, Austin Faulconer, Keon Habbaba, Katherine Loundy, Louis Schaefer, Alexa Frost, Andrew Foran, Robert Brown, Luis Rabelo
National Aeronautics and Space Administration (NASA) is preparing for a manned mission to Mars to test the sustainability of civilization on the planet Mars. Our research explores the requirements and feasibility of autonomously producing fuel on Mars for a return trip back to Earth. As a part of NASA’s initiative for a manned trip to Mars, our team’s work creates and analyzes the allocation of resources necessary in deploying a fuel station on this foreign soil. Previous research has addressed concerns with a number individual components of this mission such as power required for fuel station and tools; however, the interactions between these components and the effects they would have on the overall requirements for the fuel station are still a mystery to NASA. By creating a baseline discrete-event simulation model in a simulation software called Simio, the research team has been able to replicate the fuel production process on Mars.
2017-09-19
Technical Paper
2017-01-2022
Katherine Loundy, Louis Schaefer, Andrew Foran, Catherine Ninah, Khristopher Bandong, Robert Brown, Hunter Heston, John-Paul Steed, William Young, Mark Heinrich, Luis Rabelo
The future of human exploration in the solar system is contingent on the ability to exploit resources in-situ to produce mission consumables. Specifically, it has become clear that the success of a manned mission to Mars will likely depend on fuel components created on the Martian surface. While several architectures for an un-manned fuel production surface facility on Mars exist in theory, a simulation of the performance and operation of these architectures has not been created. In this paper, the framework describing a simulation of one such architecture is defined. Within this architecture, each component of the base is implemented as a state machine, with the ability to communicate with other base elements as well as a supervisor. An environment supervisor is also created which governs low level aspects of the simulation such as movement and resource distribution, in addition to higher-level aspects such as location selection with respect to operations specific behavior.
2017-09-19
Technical Paper
2017-01-2028
Steven Nolan, Patrick Norman, Graeme Burt, Catherine Jones
Turbo-electric distributed propulsion (TeDP) for aircraft allows for the complete redesign of the airframe so that greater overall fuel and emissions benefits can be achieved. Whilst conventional electrical power systems may be used for smaller aircraft, much larger aircraft are likely to require the use of superconducting electrical power systems to enable the required whole system power density and efficiency levels to be achieved. The TeDP concept requires an effective electrical fault management and protection system. However, the fault response of a superconducting TeDP power system and its components has not been well studied to date, limiting the effective capture of associated protection requirements. For example, with superconducting systems it is the possible that a hotspot is formed on one of the components, such as a cable. This can result in one subsection, rather than all, of a cable quenching.
2017-09-19
Technical Paper
2017-01-2032
Nisha Kondrath
Efficient, small, and reliable dc-dc power converters with high power density are highly desirable in applications such as aerospace and electric vehicles, where battery storage is limited. Bidirectional full-bridge (FB) dc-dc converters are very popular in medium and high-power applications requiring regenerative capabilities. Full-bridge topology has several advantages such as: • Inherent galvanic isolation between input and output and high conversion ratio due to the transformer with a turns ratio n. • Reduction in passive component sizes due to the increase in inductor current frequency to twice the switching frequency. • Reduced voltage stresses on the low-voltage side switches and current stresses on the high-voltage side switches. However, due to the high number of switches, device losses increase.
2017-09-19
Technical Paper
2017-01-2031
Nisha Kondrath, Dalvir Saini, Nathaniel Smith
In aerospace applications, it is important to have efficient, small, affordable, and reliable power conversion units with high power density to supply a wide range of loads. Use of wide-band gap devices, such as Silicon Carbide (SiC) and Gallium Nitride (GaN) devices, in power electronic converters is expected to reduce the device losses and needs for extensive thermal management systems in power converters, as well as facilitate high-frequency operation, thereby reducing the passive component sizes and increasing the power density. A novel hybrid SiC-GaN based full-bridge dc-dc buck converter with improved efficiency for high power applications will be presented in this paper. With the current device manufacturing technology, GaN devices can only handle breakdown voltages up to 650 V, while SiC devices can handle up to 1200 V. GaN devices exhibit remarkable switching performance compared to SiC devices.
2017-09-19
Technical Paper
2017-01-2037
Daniel Schlabe, Dirk Zimmer, Alexander Pollok
The thermal inertia of aircraft cabins and galleys is significant for commercial aircraft. The aircraft cabin is controlled by the Environment Control System (ECS) to reach, among other targets, a prescribed temperature. Allowing a temperature band of e.g. 2 K around the prescribed temperature, it is possible to use the cabin dynamics as an energy storage. This storage can then be used to reduce electrical peak power, increase efficiency of ECS, reduce thermal cooling peak power, or reduce engine offtake if it is costly or not sufficiently available. In the same way, also the aircraft galleys can be exploited. Since ECS and galleys are among the largest consumers of electrical power or bleed air, there is a large potential on improving energy efficiency or reducing system mass to reduce fuel consumption of aircraft. This paper investigates different exploitation strategies of cabin and galley dynamics using modelling and simulation.
2017-09-19
Technical Paper
2017-01-2035
Eric C. Bauer, Nima Niassati, John Brothers, John Troth, Jeff Hensal, Jin Wang, Daniel Schweickart, Dennis Grosjean
As applications in aerospace, transportation and data centers are faced with increased electric power consumption, their dc operating voltages have increased to reduce cable weight and to improve efficiency. Electric arcs in these systems still cause dangerous fault conditions and have garnered more attention in recent years. Arcs can be classified as either low impedance or high impedance arcs and both can cause insulation damage and fires. Low impedance arcs release lots of energy when high voltage becomes nearly shorted to ground. High impedance arcs can occur when two current-carrying electrodes are separated, either by vibration of a loose connection or by cables snapping. The high impedance arc decreases load current due to a higher equivalent load impedance seen by the source. This complicates the differentiation of a high impedance arc fault from normal operation.
2017-09-19
Technical Paper
2017-01-2034
Bailey Hall, Benjamin Palmer, Tyler Milburn, Luis Herrera, Bang Tsao, Joseph Weimer
Future aircrafts will demand a significant amount of flight critical electrical power to drive the primary flight control surfaces. These electrical architectures will need to meet the load requirements and provide power to the flight critical buses at all times. For this to happen, a fast, resilient, and autonomous control scheme is needed. In this presentation, formal methods and linear temporal logic are used to develop a contactor control scheme to meet the given specifications of an electrical power system. The resulting control strategy is able to manage multiple contactors during different types of generator failures, while ensuring that flight critical buses maintain power. To verify the feasibility of the proposed control scheme, a real-time simulation platform is developed. Capability to test the control strategy, along with any future versions, was implemented with a microprocessor and analog/digital I/O’s (Hardware in the Loop).
2017-09-19
Technical Paper
2017-01-2033
Minh-khoa. Lam, Christopher Buterhaugh, Luis Herrera, Bang Tsao
In order to study the effects on the drive shaft connecting the generator and gearbox, a detailed model of the shaft with multiple degrees of freedom was developed. An accessory gearbox model was also included in order to simulate a more realistic load on the engine. The engine is modeled using NASA’s T-MATS (Toolbox for the Modeling and Analysis of Thermodynamic Systems) software. The dynamic Dual Spool High Bypass engine, model JT9D, was used for this study. A synchronous generator is connected to the high-pressure and low-pressure spool (one generator per spool). The overall system model is composed by the engine, the shaft, the gearbox, the generator, and the electric loads. The shaft is modeled through a direct connection between the generator and the engine. Lastly, the gearbox contains multiple different loads extracting power from the engine as well as the power losses associated with gears through friction and other means.
2017-09-19
Technical Paper
2017-01-2135
Alex Thirkell, Rui Chen, Ian Harrington
Electrification of aircraft is on track to be a future key design principal due to the increasing pressure on the aviation industry to significantly reduce harmful emissions by 2050 and the increased use of electrical equipment. This has led to an increased focus on the research and development of alternative power sources for aircraft, including fuel cells. These alternative power sources could either be used to provide propulsive power or as an Auxiliary Power Unit (APU). Previous studies have considered isolated design cases where a fuel cell system was tailored for their specific application. To accommodate for the large variation between aircraft, this study covers the design of an empirical model, which will be used to size a fuel cell system for any given aircraft based on basic design parameters. The model was constructed utilising aircraft categorisation, fuel cell sizing and balance of plant sub-models.
2017-09-19
Technical Paper
2017-01-2136
Almuddin Rustum Sayyad, Pratik Salunke, Sangram Jadhav
The objective of this work is to optimize the operating parameters of the Direct Injection single cylinder (5.2 kw) CI engine with respect to Brake Thermal Efficiency (BTHE), Hydro carbons (HC) and Carbon dioxide (CO2). For this investigation, we used Simarouba Biodiesel as an alternate fuel for diesel fuel which possesses low cetane number which is not sufficient to operate existing diesel engine. However, this could be combined with the diesel fuel in the form of blends. For this investigation four levels and four parameters were selected viz. Injection Pressure (IP), Fuel Fraction (FF), Compression Ratio (CR) and Injection Timing (Before TDC). Taguchi Method is used for minimizing the number of experiments and Multiple Regression Analysis is used to find the optimum condition. Three outputs variables such as; Brake Thermal Efficiency (BTHE), content of HC particles and CO2 in the emission are measured and considered its influence on CI Engine performance.
2017-09-19
Technical Paper
2017-01-2137
Dnyaneshwar V. Kadam, Sangram D. Jadhav
Vibration is the most considerable factor in dynamics of machinery. Vibration causes unfavorable effects on engine components and may reduce the life of engine. The conventional fossil fuel sources are limited in the world. The dependency on diesel should be reduced by using biodiesel as an alternative fuel in next few years. The input parameters are affected on engine performance and emission. The present study mainly focuses on an optimization of vibrations, performance and emission using Taguchi and multiple regression analysis for biodiesel as a fuel. The test was performed on single cylinder, four-stroke, diesel engine with VCR. Taguchi method is used to prepare the design of experiment of L16 array for minimizing number of experiments and multiple regression analysis for finding the best relationship between the input and output parameters. The selected input parameters are: fuel fraction, compression ratio, injection pressure and injection timing.
2017-09-04
Technical Paper
2017-24-0116
Ekarong Sukjit, Pansa Liplap, Somkiat Maithomklang, Weerachai Arjharn
In this study, two oxygenated fuels consisting of butanol and diethyl ether (DEE), both possess same number of carbon, hydrogen and oxygen atom but difference functional group, were blended with the waste plastic pyrolysis oil to use in a 4-cylinder direct injection diesel engine without any engine modification. In addition, the effect of castor oil addition to such fuel blends was also investigated. Four tested fuels with same oxygen content were prepared for engine test, comprising DEE16 (84% waste plastic oil blended with 16% DEE), BU16 (84% waste plastic oil blended with 16% butanol), DEE11.5BIO5 (83.5% waste plastic oil blended with 11.5% DEE and 5% castor oil) and BU11.5BIO5 (83.5% waste plastic oil blended with 11.5% butanol and 5% castor oil). The results found that the DEE addition to waste plastic oil increased more emissions than the butanol addition at low engine operating condition.
2017-09-04
Technical Paper
2017-24-0099
Francesco Catapano, Paolo Sementa, Bianca Maria Vaglieco
Gasoline direct injection (GDI) allows knock tendency reduction in spark-ignition engines mainly due to the cooling effect of the in-cylinder fuel evaporation. However, the charge formation and thus the injection timing and strategies deeply affect the flame propagation and consequently the knock occurrence probability and intensity. Present work investigates the tendency to knock of a GDI engine at 1500 rpm full load under different injection strategies, single and double injections, obtained delivering the same amount of gasoline in two equal parts, the first during intake, the second during compression stroke. In these conditions, conventional and non-conventional measurements are performed on a 4-stroke, 4-cylinder, turbocharged GDI engine endowed of optical accesses to the combustion chamber.
2017-09-04
Technical Paper
2017-24-0081
Luigi De Simio, Michele Gambino, Sabato Iannaccone
In recent years the use of alternative fuels for internal combustion engines has had a strong push coming from both technical and economic-environmental aspects. Among these, gaseous fuels such as liquefied petroleum gas and natural gas have occupied a segment no longer negligible in the automotive industry, thanks to their adaptability, anti-knock capacity, lower toxicity of pollutants, reduced CO2 emissions and cost effectiveness. On the other hand, diesel engines still represent the reference category among the internal combustion engines in terms of consumptions. The possibility offered by the dual fuel (DF) systems, to combine the efficiency and performance of a diesel engine with the advantages offered by the gaseous fuels, has been long investigated. However the simple replacement of diesel fuel with natural gas does not allow to optimize the performance of the engine due to the high THC emissions particularly at lower loads.
2017-09-04
Technical Paper
2017-24-0078
R. Vallinayagam, S. Vedharaj, Yanzhao An, Alaaeldin Dawood, Mohammad Izadi Najafabadi, Bart Somers, Junseok Chang, Mani Sarathy, Bengt Johansson
Abstract Light naphtha is the light distillate from crude oil and can be used in compression ignition (CI) engines; its low boiling point and octane rating (RON = 64.5) enable adequate premixing. This study investigates the combustion characteristics of light naphtha (LN) and its multicomponent surrogate under various start of injection (SOI) conditions. LN and a five-component surrogate for LN, comprised of 43% n-pentane, 12% n-heptane, 10% 2-methylhexane, 25% iso-pentane and 10% cyclo-pentane, has been tested in a single cylinder optical diesel engine. The transition in combustion homogeneity from CI combustion to homogenized charge compression ignition (HCCI) combustion was then compared between LN and its surrogate. The engine experimental results showed good agreement in combustion phasing, ignition delay, start of combustion, in-cylinder pressure and rate of heat release between LN and its surrogate.
2017-09-04
Technical Paper
2017-24-0082
Muhammad Umer Waqas, Nour Atef, Eshan Singh, Jean-Baptiste MASURIER, Mani Sarathy, Bengt Johansson
Abstract The blending of ethanol with PRF (Primary reference fuel) 84 was investigated and compared with FACE (Fuels for Advanced Combustion Engines) A gasoline surrogate which has a RON of 83.9. Previously, experiments were performed at four HCCI conditions but the chemical effect responsible for the non-linear blending behavior of ethanol with PRF 84 and FACE A was not understood. Hence, in this study the experimental measurements were simulated using zero-dimensional HCCI engine model with detailed chemistry in CHEMKIN PRO. Ethanol was used as an octane booster for the above two base fuels in volume concentration of 0%, 2%, 5% and 10%. The geometrical data and the intake valve closure conditions were used to match the simulated combustion phasing with the experiments. Low temperature heat release (LTHR) was detected by performing heat release analysis.
2017-09-04
Technical Paper
2017-24-0080
Ross Ryskamp, Gregory Thompson, Daniel Carder, John Nuszkowski
Abstract Reactivity controlled compression ignition (RCCI) is a form of dual-fuel combustion that exploits the reactivity difference between two fuels to control combustion phasing. This combustion approach limits the formation of oxides of nitrogen (NOX) and soot while retaining high thermal efficiency. The research presented herein was performed to determine the influences that high reactivity (diesel) fuel properties have on RCCI combustion characteristics, exhaust emissions, fuel efficiency, and the operable load range. A 4-cylinder, 1.9 liter, light-duty compression-ignition (CI) engine was converted to run on diesel fuel (high reactivity fuel) and compressed natural gas (CNG) (low reactivity fuel). The engine was operated at 2100 revolutions per minute (RPM), and at two different loads, 3.6 bar brake mean effective pressure (BMEP) and 6 bar BMEP.
2017-09-04
Technical Paper
2017-24-0083
Hassan Khatamnejad, Shahram Khalilarya, Samad Jafarmadar, Mostafa Mirsalim, Mufaddel Dahodwala
Abstract RCCI strategy gained popularity in automotive applications due to lower fuel consumption, less emissions formation and higher engine performance in compared with other diesel combustion strategies. This study presents results of an experimental and numerical investigation on RCCI combustion using natural gas as a low reactivity premixed fuel with advanced injection of diesel fuel as a high reactivity fuel in a CI engine. An advanced three dimensional CFD simulation coupled with chemical kinetic developed to examine the effects of diesel injection timing, diesel/natural gas ratio and diesel fuel included spray angle on combustion and emissions formation in various engine loads and speeds, in a heavy duty diesel engine.
Viewing 1 to 30 of 16509