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Multi-Dimensional Engine Modeling, 2017
Viewing 1 to 35 of 35
Numerical Modeling of International Variations in Diesel Spray Combustion with Evaporation Surrogate and Virtual Species Conversion
Author(s): Kurimoto, N., Watanabe, N., Hoshi, S., Sasaki, S. et al.
Abstract A methodology for simulating effect of international variations in fuel compositions on spray combustion is proposed. The methodology is validated with spray combustion experiments with real ....
Distillation-based Droplet Modeling of Non-Ideal Oxygenated Gasoline Blends: Investigating the Role of Droplet Evaporation on PM Emissions
Author(s): Burke, S., Ratcliff, M., McCormick, R., Rhoads, R. et al.
Abstract In some studies, a relationship has been observed between increasing ethanol content in gasoline and increased particulate matter (PM) emissions from vehicles equipped with spark ignition eng....
Dilute Combustion Assessment in Large Bore, Low Speed Engines
Author(s): Abidin, Z., Hoag, K., and Badain, N.
Abstract The promising D-EGR gasoline engine results achieved in the test cell, and then in a vehicle demonstration have led to exploration of further possible applications. A study has been conducted....
Advanced Methodology to Investigate Knock for Downsized Gasoline Direct Injection Engine Using 3D RANS Simulations
Author(s): Chevillard, S., Colin, O., Bohbot, J., Wang, M. et al.
Abstract Nowadays Spark Ignition (SI) engine developments focus on downsizing, in order to increase the engine load level and consequently its efficiency. As a side effect, knock occurrence is strongl....
Numerical Investigation of a Gasoline-Like Fuel in a Heavy-Duty Compression Ignition Engine Using Global Sensitivity Analysis
Author(s): Pal, P., Probst, D., Pei, Y., Zhang, Y. et al.
Abstract Fuels in the gasoline auto-ignition range (Research Octane Number (RON) > 60) have been demonstrated to be effective alternatives to diesel fuel in compression ignition engines. Such fuels al....
An Insight on the Spray-A Combustion Characteristics by Means of RANS and LES Simulations Using Flamelet-Based Combustion Models
Author(s): Akkurt, B., Akargun, H., Somers, L., Deen, N. et al.
Abstract Advanced Computational Fluid Dynamics (CFD) modeling of reacting sprays provides access to information not available even applying the most advanced experimental techniques. This is particula....
Study on Methods of Coupling Numerical Simulation of Conjugate Heat Transfer and In-Cylinder Combustion Process in GDI Engine
Author(s): Wu, M., Pei, Y., Qin, J., Li, X. et al.
Abstract Wall temperature in GDI engine is influenced by both water jacket and gas heat source. In turn, wall temperature affects evaporation and mixing characteristics of impingement spray as well as....
Assessment of Large-Eddy Simulations of Turbulent Round Jets Using Low-Order Numerical Schemes
Author(s): Wang, Z., Ameen, M., Som, S., and Abraham, J.
Abstract The basic idea behind large-eddy simulation (LES) is to accurately resolve the large energy-containing scales and to use subgrid-scale (SGS) models for the smaller scales. The accuracy of LES....
CFD Modelling of the Effects of Exhaust Gas Recirculation (EGR) and Injection Timing on Diesel Combustion and Emissions
Author(s): Verma, I., Meeks, E., Bish, E., Kuntz, M. et al.
Abstract Emissions from Diesel engines have been a major concern for many years, particularly with regards to the impact of NOx and particulate matter on human health. Exhaust gas re-circulation (EGR)....
Computational Study of Stratified Combustion in an Optical Diesel Engine
Author(s): Mubarak ali, M., Hernandez Perez, F., Vallinayagam, R., Vedharaj, S. et al.
Abstract Full cycle simulations of KAUST optical diesel engine were conducted in order to provide insights into the details of fuel spray, mixing, and combustion characteristics at different start of ....
An Efficient and Unified Combustion Model for CFD of SI and CI Engine Operation
Author(s): Wang, M., Gao, S., and Lee, C.
Abstract In this work, an efficient and unified combustion model is introduced to simulate the flame propagation, diffusion-controlled combustion, and chemically-driven ignition in both SI and CI engi....
Modeling n-dodecane Spray Combustion with a Representative Interactive Linear Eddy Model
Author(s): Lackmann, T., Lucchini, T., D'Errico, G., Kerstein, A. et al.
Abstract Many new combustion concepts are currently being investigated to further improve engines in terms of both efficiency and emissions. Examples include homogeneous charge compression ignition (H....
Effect of Engine Parameters on Mixture Stratification in a Wall-Guided GDI Engine - A Quantitative CFD Analysis
Author(s): Addepalli, K. and Mallikarjuna, J.
Abstract Today, GDI engines are becoming very popular because of better fuel economy and low exhaust emissions. The gain in fuel economy in these engines is realized only in the stratified mode of ope....
Critical Aspects on the Use of Thermal Wall Functions in CFD In-Cylinder Simulations of Spark-Ignition Engines
Author(s): Berni, F., Fontanesi, S., Cicalese, G., and D'Adamo, A.
Abstract CFD and FE tools are intensively adopted by engine manufacturers in order to prevent thermo-mechanical failures reducing time- and cost-to market. The capability to predict correctly the phys....
Multidimensional Simulations of Combustion in Methane-Diesel Dual-Fuel Light-Duty Engines
Author(s): Fraioli, V., Beatrice, C., Di Blasio, G., Belgiorno, G. et al.
Abstract The adoption of gaseous fuels for Light Duty (LD) engines is considered a promising solution to efficiently reduce greenhouse gases emissions and diversify fuels supplies, while keeping pollu....
Evaluating Different Measures to Improve the Numerical Simulation of the Mixture Formation in a Spark-Ignition CNG-DI-Engine
Author(s): Twellmeyer, A., Kopple, F., and Weigand, B.
Abstract Compressed Natural Gas (CNG) is a promising alternative fuel for internal combustion engines as its combustion is fuel-efficient and lean in carbon dioxide compared to gasoline. The high octa....
Physics of Combustion Noise Reduction with Multiple Injections in a DI Diesel Engine - A Computational Study
Author(s): Diwakar, R. and Domenech-Llopis, V.
Abstract With the ability of modern high pressure diesel injectors to deliver accurate, closely coupled multiple pulse injections, it is possible to minimize engine combustion noise without negative e....
A Numerical Method to Simulate Intake-Port Fuel Distribution in PFI Engine and Its Application
Author(s): Yu, J., Abe, M., and Sukegawa, Y.
Abstract We developed a numerical method for PFI engine, which would take complex intake-port phenomena into consideration. Numerical study for PFI engine has additional difficulty compared with that ....
Implementation of a Tabulated Flamelet Model for Compression Ignition Engine Applications
Author(s): Kundu, P., Ameen, M., Unnikrishnan, U., and Som, S.
Abstract Modeling unsteady turbulent flame development in lifted spray flames is important as a strong correlation exists between pollutant formation and the transient flame features such as auto-igni....
Simulations of Spark-Plug Transient Plasma Breakdown in Automotive Internal Combustion Engines
Author(s): Karpatne, A., Breden, D., and Raja, L.
Abstract The arc breakdown phase in automotive spark-plugs is a sub-microsecond event that precedes the main spark event. This phase is typically characterized by strong non-equilibrium plasma phenome....
Comparison of Linear, Non-Linear and Generalized RNG-Based k-epsilon Models for Turbulent Diesel Engine Flows
Author(s): Perini, F., Zha, K., Busch, S., and Reitz, R.
Abstract In this work, linear, non-linear and a generalized renormalization group (RNG) two-equation RANS turbulence models of the k-epsilon form were compared for the prediction of turbulent compress....
Effect of Start of Injection on the Combustion Characteristics in a Heavy-Duty DICI Engine Running on Methanol
Author(s): Pucilowski, M., Jangi, M., Shamun, S., Li, C. et al.
Abstract Methanol as an alternative fuel in internal combustion engines has an advantage in decreasing emissions of greenhouse gases and soot. Hence, developing of a high performance internal combusti....
Multidimensional Modeling of Injection and Combustion Phenomena in a Diesel Ignited Gas Engine
Author(s): Eder, L., Kiesling, C., Priesching, P., Pirker, G. et al.
Abstract Using natural gas as a fuel in internal combustion engines is a promising way to obtain efficient power generation with relatively low environmental impact. Dual fuel operation is especially ....
Numerical Analysis of the Steady-State Scavenging Flow Characteristics of a Two-Stroke Marine Engine
Author(s): Cui, L., Wang, T., Sun, K., Lu, Z. et al.
Abstract The scavenging process in two-stroke marine engines not only transports burnt gas out of the cylinder but also provides fresh air for the next cycle, thereby significantly affecting the engin....
CFD Modeling and Experimental Analysis of a Homogeneously Charged Turbulent Jet Ignition System in a Rapid Compression Machine
Author(s): Gholamisheeri, M., Thelen, B., and Toulson, E.
Abstract Three dimensional numerical simulation of the transient turbulent jet and ignition processes of a premixed methane-air mixture of a turbulent jet ignition (TJI) system is performed using Conv....
Modeling Non-Premixed Combustion Using Tabulated Kinetics and Different Fame Structure Assumptions
Author(s): Lucchini, T., D'Errico, G., Onorati, A., Frassoldati, A. et al.
Abstract Nowadays, detailed kinetics is necessary for a proper estimation of both flame structure and pollutant formation in compression ignition engines. However, large mechanisms and the need to inc....
Numerical Simulation and Flame Analysis of Combustion and Knock in a DISI Optically Accessible Research Engine
Author(s): Iaccarino, S., Breda, S., D'Adamo, A., Fontanesi, S. et al.
Abstract The increasing limitations in engine emissions and fuel consumption have led researchers to the need to accurately predict combustion and related events in gasoline engines. In particular, kn....
Evaluation of Kinetics Process in CFD Model and Its Application in Ignition Process Analysis of a Natural Gas-Diesel Dual Fuel Engine
Author(s): Li, Y., Guo, H., and Li, H.
Abstract Computational fluid dynamics (CFD) model has been widely applied in internal combustion (IC) engine research. The integration of chemical kinetic model with CFD provides an opportunity for re....
Modeling Ignition and Premixed Combustion Including Flame Stretch Effects
Author(s): Sforza, L., Lucchini, T., Onorati, A., Zhu, X. et al.
Abstract Objective of this work is the incorporation of the flame stretch effects in an Eulerian-Lagrangian model for premixed SI combustion in order to describe ignition and flame propagation under h....
Development of a RANS-Based Knock Model to Infer the Knock Probability in a Research Spark-Ignition Engine
Author(s): D'Adamo, A., Breda, S., Iaccarino, S., Berni, F. et al.
Abstract Engine knock is one of the most limiting factors for modern Spark-Ignition (SI) engines to achieve high efficiency targets. The stochastic nature of knock in SI units hinders the predictive c....
CFD-Guided Heavy Duty Mixing-Controlled Combustion System Optimization with a Gasoline-Like Fuel
Author(s): Pei, Y., Zhang, Y., Kumar, P., Traver, M. et al.
Abstract A computational fluid dynamics (CFD) guided combustion system optimization was conducted for a heavy-duty compression-ignition engine with a gasoline-like fuel that has an anti-knock index (A....
Study of LES Quality Criteria in a Motored Internal Combustion Engine
Author(s): Ko, I., D'Adamo, A., Fontanesi, S., and Min, K.
Abstract In recent years, Large-Eddy Simulation (LES) is spotlighted as an engineering tool and severe research efforts are carried out on its applicability to Internal Combustion Engines (ICEs). Howe....
Modeling Flash Breakup for a Direct-Injection Spark-Ignition Gasoline Engine
Author(s): Kim, T. and Park, S.
Abstract An important challenge for modeling Direct-Injection Spark-Ignition (DISI) gasoline engines is understanding flash boiling spray. Flash boiling occurs when the ambient pressure is lower than ....
Modeling of Reactive Spray Processes in DI Diesel Engines
Author(s): Petranovic, Z., Edelbauer, W., Vujanović, M., Priesching, P. et al.
Abstract Commonly, the spray process in Direct Injection (DI) diesel engines is modeled with the Euler Lagrangian discrete droplet approach which has limited validity in the dense spray region, close ....
Numerical Simulation of Gasoline and n-Butanol Combustion in an Optically Accessible Research Engine
Author(s): Breda, S., D'Adamo, A., Fontanesi, S., D'Orrico, F. et al.
Abstract Conventional fossil fuels are more and more regulated in terms of both engine-out emissions and fuel consumption. Moreover, oil price and political instabilities in oil-producer countries are....
Viewing 1 to 35 of 35