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Effect of Geometric Structure of Cylinder Head on the Combustion Process in a Diesel Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 28, 2017 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
Due to increasingly stringent emission and fuel consumption regulations, diesel engines for vehicle are facing more and more technical challenges. Engine downsizing technology is the most promising measures to deal with these challenges at present. With the enhancement of power density, a small engine displacement with a high turbocharging technique becomes popular. In order to increase the intake mass flow rate on a downsizing diesel engine, the tilting axis of intake valve was chosen to enlarge the intake valve diameter and decrease the arc radius of intake ports. Thus cylinder head had to be redesigned to meet this demand. Geometry of cylinder head made a notable effect in organization of in-cylinder flow, fuel-air mixing quality and further combustion characteristics.
3-D CFD was a convenient and economical tool to explore effects of geometry of cylinder head on the combustion process. In this study, two cases of combustion chamber structure formed by one-cut and four-cut processing methods respectively were studied. This work was done on the ESE Engine module of commercial CFD software AVL FIRE and operated by comparisons of these two cases on the development of swirl ratio, equivalence ratio distribution and combustion characteristics. The results show that, in term of swirl ratio, two cases reflect a similar growing trend, but a weaker swirl (down by 9.1%) is formed in the one-cut case. Resulting from its weaker swirl level, this case delivers a 0.6°CA longer in CA5 and a 0.5°CA later in CA50 than the four-cut case under the same injection timing. However, under the same injector protrusion height, a better diffusion of mixture can be found in the one-cut case contributed by its dome shape, which enhances the increase of portion of heat release of premixing phase and the decrease by 0.9°CA in combustion duration, but the combustion efficiency of these two cases are almost the same.
CitationLi, H., Wang, K., Wang, L., Li, Y. et al., "Effect of Geometric Structure of Cylinder Head on the Combustion Process in a Diesel Engine," SAE Technical Paper 2017-01-0692, 2017, https://doi.org/10.4271/2017-01-0692.
Data Sets - Support Documents
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- 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, doi:10.4271/2013-01-2530.
- Li, Y., "A New Estimation of Swirl Ratio from Steady Flow Rig Testing," SAE Technical Paper 2014-01-2587, 2014, doi:10.4271/2014-01-2587.
- 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, doi:10.4271/2015-01-1855.
- 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, doi:10.4271/2015-01-1856.
- Kim, B., Chang, H., Lee, K., and Kim, C., "Improvement of Durability in HSDI Diesel Cylinder Head," SAE Technical Paper 2005-01-0655, 2005, doi:10.4271/2005-01-0655.
- Ghasemi, A., "Cylinder Head High/Low Cycle Fatigue CAE Analysis," SAE Technical Paper 2012-01-1991, 2012, doi:10.4271/2012-01-1991.
- Chen, X., Engler-Pinto, C., King, M., Li, M. et al., "Aluminum Cylinder Head High Cycle Fatigue Durability Including the Effects of Manufacturing Processes," SAE Technical Paper 2012-01-0540, 2012, doi:10.4271/2012-01-0540.
- Sato, K., Nishiyama, T., Murakami, O., Kunieda, K. et al., "Strength Analysis of a Cylinder Head Gasket Using Computer Simulation," SAE Int. J. Mater. Manf. 2(1):92-98, 2009, doi:10.4271/2009-01-0197.
- Freudenhammer, D., Peterson, B., Ding, C., Boehm, B. et al., "The Influence of Cylinder Head Geometry Variations on the Volumetric Intake Flow Captured by Magnetic Resonance Velocimetry," SAE Int. J. Engines 8(4):1826-1836, 2015, doi:10.4271/2015-01-1697.
- Millo, F., Luisi, S., Stroppiana, A., and Borean, F., "Effects of Different Geometries of the Cylinder Head on the Combustion Characteristics of a VVA Gasoline Engine," SAE Technical Paper 2013-24-0057, 2013, doi:10.4271/2013-24-0057.
- AVL FIRE 2008 user manual.