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Efficient Approach for Optimization of Piston Bowl Shape, Compression Ratio and EGR for DI Diesel Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 11, 2011 by SAE International in United States
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In order to meet emission norms, modern day diesel engines rely on methods of in cylinder emission reduction and expensive exhaust after treatment devices. Engine manufacturers across the world are finding it hard to maintain balance between customers' demand for better fuel consumption and obeying the stringent legislative emission regulations. Optimum combination of variables such as piston bowl shape, compression ratio, fuel injection and turbo charging systems precisely matched with engine, Exhaust Gas Re-circulation (EGR) rate etc can result in refined combustion leading to better engine out emissions as well as fuel efficiency.
Optimization of piston bowl geometry and EGR rate would require a lot of experiments, which involves cost and time. If the numbers of variants of piston bowl shapes or EGR rates are more, so would be the expensive and require more testing time. Such approach proves to be inefficient in today's scenario, where minimizing the development time and expenses are the key objectives. In the present work, a approach based on 3D CFD simulation for optimization of piston bowl together with EGR rate is presented. Multidimensional CFD code “Engine Simulation Environment” i.e “ESE Diesel” of AVL-FIRE is used to run the simulations. The model is first validated with available engine measurements and then used for the optimization work. Three different shapes of piston bowl were selected for simulation. Combustion simulation was carried out to select optimum bowl shape. With the optimum bowl shape, simulation iterations were performed by varying EGR rate from 0 to 20%. NOx & exhaust soot trends are compared for different simulation model. Optimum bowl shape and EGR rate were decided based on the targets for specific fuel consumption, exhaust emissions, percentage of soot etc. Final combination of piston bowl shape and EGR rate was actually tested on engine. Test results in close conformity with simulation results were observed.
A significant reduction in number of test experiments and the associated time and cost was experienced by following this simulation centric approach.
- Shabbir Sheikh - Kirloskar Oil Engines Ltd., Pune
- Nitin Gokhale - Kirloskar Oil Engines Ltd., Pune
- Vishal Thatte - Kirloskar Oil Engines Ltd., Pune
- Naresh Gandhi - Kirloskar Oil Engines Ltd.,Pune
- Bhalchandra Deshmukh - Kirloskar Oil Engines Ltd., Pune
- Yogesh Aghav - Kirloskar Oil Engines Ltd.,Pune
- M Kumar - Kirloskar Oil Engines Ltd., Pune
- M. Nandgaonkar - Govt. College of Engineering (COEP),Pune
- M .K. Babu - Indian Institute of Technology - Delhi
CitationSheikh, S., Gokhale, N., Thatte, V., Gandhi, N. et al., "Efficient Approach for Optimization of Piston Bowl Shape, Compression Ratio and EGR for DI Diesel Engine," SAE Technical Paper 2011-24-0013, 2011, https://doi.org/10.4271/2011-24-0013.
- Katsuhiko, Miyamoto et al “Enhancement of Combustion by Means of Squish piston” Technical Series 2006
- Genzale, C. Reitz, R. Wickman, D. “A Computational Investigation into the Effects of Spray Targeting, Bowl Geometry and Swirl Ratio for Low-Temperature Combustion in a Heavy-Duty Diesel Engine,” SAE Technical Paper 2007-01-0119 2007 10.4271/2007-01-0119
- Diwakar, R. Singh, S. “Importance of Spray-Bowl Interaction in a DI Diesel Engine Operating under PCCI Combustion Mode,” SAE Technical Paper 2009-01-0711 2009 10.4271/2009-01-0711
- Kidoguchi, Y. Yang, C. Miwa, K. “Effect of High Squish Combustion Chamber on Simultaneous Reduction of NOx and Particulate from a Direct-Injection Diesel Engine,” SAE Technical Paper 1999-01-1502 1999 10.4271/1999-01-1502
- Bensler, H. Bühren, F. Samson, E. Vervisch, L. “3-D CFD Analysis of the Combustion Process in a DI Diesel Engine using a Flamelet Model,” SAE Technical Paper 2000-01-0662 2000 10.4271/2000-01-0662
- Montajir, R. Tsunemoto, H. Ishitani, H. Koji, T. et al. “A New Combustion Chamber Concept for Low Emissions in Small DI Diesel Engines,” SAE Technical Paper 2001-01-3263 2001 10.4271/2001-01-3263
- Ikegami, M. Fukuda, M. Yoshihara, Y. Kaneko, J. “Combustion Chamber Shape and Pressurized Injection in High-Speed Direct-Injection Diesel Engines,” SAE Technical Paper 900440 1990 10.4271/900440
- Haworth, D. “A Review of Turbulent Combustion Modeling for Multidimensional In-Cylinder CFD,” SAE Technical Paper 2005-01-0993 2005 10.4271/2005-01-0993
- Taskinen, P. “Effect of Fuel Spray Characteristics on Combustion and Emission Formation in a Large Medium Speed Diesel Engine,” SAE Technical Paper 982583 1998 10.4271/982583
- Chikahisa, T. Murayama, T. “Theory and Experiments on Air-Entrainment in Fuel Sprays and Their Application to Interpret Diesel Combustion Processes,” SAE Technical Paper 950447 1995 10.4271/950447
- Yoshizaki, T. Nishida, K. Hiroyasu, H. Song, K. “Three-Dimensional Spray Distributions in a Direct Injection Diesel Engine,” SAE Technical Paper 941693 1994 10.4271/941693