This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Optimization of Mixture Formation and Combustion in Two-Stroke OP Engine Using Innovative Diesel Spray Combustion Model and Fuel System Simulation Software
Technical Paper
2015-01-1859
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
In this study theoretical investigations were carried out to determine design and working parameters modifications in order to increase by 20% power output and reduce fuel consumption in a marine two stroke medium speed diesel engine with opposite pistons. To achieve the above aim software packages, such as DIESEL-RK, INJECT and ANSYS, were deployed.
The phenomenological multi-zone fuel spray combustion model in DIESEL RK software was refined to take into account complex interactions of fuel sprays and the influence of air swirl in the cylinder on evolution of fuel spays. For this purposes a 3D grid was created with regular cubical cells in the combustion chamber of the engine. The density of mesh was 50 cells across the diameter of the cylinder. In contrast to CFD technique, the transfer of liquid fuel and fuel vapour in the computational grid was carried out using empirical equations which had been validated by other researchers. Such novel approach made it possible to preserve the high speed computational performance of DIESEL-RK and good accuracy of modeling. In this new methodology for calculation of combustion in multiple zones only energy balance equation is solved to calculate the temperature of combustion gases, fuel droplets and process of fuel evaporation. Computational time for modeling of one mode of engine's operation takes only few minutes even for the case when 8 side injectors are deployed in the cylinder. For optimisation of angles of sprays orientation a sub-programme is developed in C++ for 3D visualisation of modelling results using the cross platform library OpenGL. With refined model of combustion DIESEL-RK was further developed to make it possible to simulate simultaneous application of several separate fuel injection systems even with supply of different types of fuel into the cylinder. Optimisation of the engine also results in specification of requirements to fuel supply systems. Using such technical specification of requirements and using INJECT software the main design features of the main elements of the high pressure pump, pipe work of the fuel supply system and fuel injector are defined. It was found that the fuel injection pressure should be higher than 2000 bar but lower than 2800 bar so the Common Rail fuel supply system does not have advantages over conventional unit pump systems if no ultra-low limits on the level of emissions are imposed. Finally, the thermal loading of the engine's piston was evaluated using ANSYS software. It was found that the maximum temperature on edges of the piston's crown made of cast iron limits the level of enhancing of engine's performance.
Recommended Content
Authors
Topic
Citation
Grekhov, L., Mahkamov, K., and Kuleshov, A., "Optimization of Mixture Formation and Combustion in Two-Stroke OP Engine Using Innovative Diesel Spray Combustion Model and Fuel System Simulation Software," SAE Technical Paper 2015-01-1859, 2015, https://doi.org/10.4271/2015-01-1859.Also In
References
- Fromm L. , Herold R. , Koszewnik J. , Regner G. Modernizing the opposed-piston engines for more efficient military ground vehicle applications 2012 NDIA Ground Vehicle Systems Engineering and Technology Symposium / Power and Mobility (P&M) Mini-Symposium August 14 16 Michigan 9
- Pirault Jean-Pierre , Flint Martin Opposed Piston Engines: Evolution, Use, and Future Applications SAE International Warrendale, Pa 978-0-7680-1800-4 2009 563
- Riazancev N.K. Modern Ukrainian tank diesels Dvigatelestroenie 2001 3 3 5
- Kinzhalov O.S. Diesels and gas engines Branch catalogue Moscow 1991 192
- Kuleshov A.S. Model for predicting air-fuel mixing, combustion and emissions in DI diesel engines over whole operating range SAE Tech. Pap. Ser. 2005-01-2119 2005
- Kuleshov , A. Multi-Zone DI Diesel Spray Combustion Model for Thermodynamic Simulation of Engine with PCCI and High EGR Level SAE Int. J. Engines 2 1 1811 1834 2009 10.4271/2009-01-1956
- Kuleshov A.S. , Kozlov A.V. , Mahkamov K. Self-Ignition Delay Prediction in PCCI Direct Injection Diesel Engines Using Multi-Zone Spray Combustion Model and Detailed Chemistry SAE Tech. Pap. Ser. 2010-01-1960 2010
- Kuleshov A.S. Multi-Zone DI Diesel Spray Combustion Model and its application for Matching the Injector Design with Piston Bowl Shape SAE Tech. Pap. Ser. 2007-01-1908 2007
- Kuleshov A.S. Development of simulation methods and optimization of working processes of ICE Autoref. Diss. Doct. Tech. Sc. Moscow 2011
- Razleytsev , N.F. 1980 Combustion simulation and optimization in diesels Kharkov Vischa shkola 169
- Lyshevsky , A.S. 1971 Fuel atomization in marine diesels Leningrad 248
- Vyrubov , D.N. 1954 Method of calculation of fuel evaporation Publications of BMSTU 25 20 34
- Vyrubov , D.N. 1946 Formation of air/fuel mixture in IC engines Working processes of IC engines Moscow MASHGIZ 5 54
- http://energy.power.bmstu.ru/e02/inject/i03rus.htm
- Grekhov L.V. , Gabitov I.I. , Negovora A.V. Design, calculation and technical service of fuel equipment of modern diesel engines: Textbook. - M. Publishing House of the Legion Autodata 2013 292
- Kuleshov A.S. , Grekhov L.V. Multidimensional Optimization of DI Diesel Engine Process Using Multi-Zone Fuel Spray Combustion Model and Detailed Chemistry NOx Formation Model SAE Tech. Pap. Ser. 2013-01-0882 2013