The Effect of Intake Port Shape on Gasoline Engine Combustion in Cylinder
The effect of intake port shape on gasoline engine combustion performance was studied by CFD technology. The correlation of CFD simulation and experiment data is good, the all results shows the combustion performance of intake port with high tumble is bet
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Abstract The effect of intake port shape on gasoline engine combustion performance was studied by CFD technology. The correlation of CFD simulation and experiment data is good, the all results shows the combustion performance of intake port with high tumble is better than that of intake port with low tumble, the high tumble in cylinder transfers into turbulence kinetic energy as the piston close to top dead center during compression stoke, it is good for accelerating the process of combustion in cylinder and improving the performance of combustion. Keywords Intake port
CFD Combustion Tumble Gasoline engine
1 Introduction The flow characteristic of intake port has a substantial influence on the combustion process in IC engines, and directly decides the engine performance and emission. The intake port shape of gasoline engine has a significant effect on tumble motion in cylinder, the tumble can accelerate fuel and air to form mixture. The high tumble in cylinder transfers into turbulence kinetic energy as the piston close to top dead center during compression stoke, that is good for accelerating the process of combustion in cylinder and increasing the flame spread speed and improving the engine performance. Intake port development is a very important component of the
F2012-A06-006 X. Chen (&) Z. Zhan Changan Auto Global R and D Center of Changan Automobile Co Ltd, Chongqing, China e-mail: [email protected]
SAE-China and FISITA (eds.), Proceedings of the FISITA 2012 World Automotive Congress, Lecture Notes in Electrical Engineering 190, DOI: 10.1007/978-3-642-33750-5_7, Ó Springer-Verlag Berlin Heidelberg 2013
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combustion system design because the charge motion in cylinder is generated during the intake stroke and it is mostly dependent on the intake port design [1]. The intake port with reasonable tumble level which was optimized by experiment and CFD has been one of the key technologies for gasoline engine development. Currently the steady CFD and test rig are used to investigate the flow capacity and tumble characteristic of intake port of gasoline engine at different valve lift, this is a very convenient way to optimizing the flow pattern, especially the CFD plays a important role in this optimization process, but the steady method is difficult for associating these parameters of intake port with engine combustion performance. It is known that the experimental characterization of the near top dead center flow field in cylinder is not practical and cost effective in an engine development. Instead, CFD is more convenient, more economical, and more versatile to study the in cylinder flow physics if its accuracy is validated with experimental results [2]. This paper presents a transient CFD computational study of charge motion and combustion process for medium and high tumble intake port in order to evaluate the effect of different intake port shape on gasoline engine combustion in cylinder. Comparison of the CFD results with the available experimental results is indicate
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