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Effect of the Depth of Valve Avoiding Pit on Combustion Process for a Heavy Duty Diesel Engine
Technical Paper
2017-01-0725
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In diesel engines, valve avoiding pit (VAP) is often designed on the top of the piston in order to avoid the interference between the valves and the piston during the engine operation. With the continued application of the downsized or high power density diesel engines, the depth of VAP has to be further deepened due to increased valve lift for more air flow into and out of the cylinder and decreased piston top clearance for less HC/CO and soot emissions. The more and more deepening of VAP changes the combustion chamber geometry, the top clearance height and the injector relative position to the piston crown. In this paper, a 3-D in-cylinder combustion model was used for a heavy duty diesel engine to investigate the effects of the depth of VAP on combustion process and emissions. Five depths of VAP were designed in this study. In order to eliminate the influence of compression ratio, the piston clearance height was adjusted for each VAP depth to keep the same compression ratio. Subsequently, injector position was adjusted in two ways, to keep the same protrusion height (Case1) or to keep a constant distance (Case 2) between the injector and the piston crown. The simulation results show that, when VAP is less than 4mm, its influence on combustion is less noticeable, with a drop of IMEP less than 0.9%. However when VAP is greater than 4mm, it leads to an evident drop of IMEP. It is also found that the deepening of VAP is beneficial for reducing soot and NO emissions. On the other hand, effects of the two Cases on IMEP are almost the same, but Case 2 leads to much lower cylinder pressure and temperature and longer combustion duration compared to Case 1.
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Wang, K., Li, H., Li, Y., liu, j. et al., "Effect of the Depth of Valve Avoiding Pit on Combustion Process for a Heavy Duty Diesel Engine," SAE Technical Paper 2017-01-0725, 2017, https://doi.org/10.4271/2017-01-0725.Data Sets - Support Documents
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References
- Demark Rüdiger et al. The New Diesel Engine Series by MTZ MTZ 2006
- Thirouard , M. , Mendez , S. , Pacaud , P. , Chmielarczyk , V. et al. Potential to Improve Specific Power Using Very High Injection Pressure In HSDI Diesel Engines SAE Technical Paper 2009-01-1524 2009 10.4271/2009-01-1524
- Friedrich Eichler , JörnKahrstedt , Markus Köhne and Martijn De Graaff The New Four-Cylinder TDI Biturbo Engine from Volkswagen MTZ 75 6 2014
- Yoo , D. , Song , J. , Kim , Y. , Jung , W. et al. Fuel Consumption Improvement of 2.4L ULPC Diesel Engine by Optimizing the Combustion System; Nozzle, Swirl Ratio and Piston Bowl Geometry SAE Technical Paper 2015-01-0785 2015 10.4271/2015-01-0785
- Rajamani , V. , Schoenfeld , S. , and Dhongde , A. Parametric Analysis of Piston Bowl Geometry and Injection Nozzle Configuration using 3D CFD and DoE SAE Technical Paper 2012-01-0700 2012 10.4271/2012-01-0700
- Genzale , C. , Reitz , R. , and 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
- Wen , M. , Li , Y. , Tan , L. , and Lyu , J. Numerical Simulation Analysis into Effects of Piston Bowl Geometry on Combustion Process for a High Power Density Diesel Engine SAE Technical Paper 2015-01-1855 2015 10.4271/2015-01-1855
- Li , Y. , Cai , Z. , Li , Y. , Li , Y. et al. Increasing a Diesel Engine Power Output by Combustion System Optimization SAE Technical Paper 2013-01-2530 2013 10.4271/2013-01-2530
- Li , H. , Lyu , J. , Li , Y. , and Zhong , L. Combustion System Optimization Across Multiple Speed/Load Points on a V8 Heavy-Duty Diesel Engine SAE Technical Paper 2015-01-1856 2015 10.4271/2015-01-1856
- Li , Y. A New Estimation of Swirl Ratio from Steady Flow Rig Testing SAE Technical Paper 2014-01-2587 2014 10.4271/2014-01-2587
- Genzale , C. , Reitz , R. , and 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
- AVL FIRE 2008 user manual