| 侯献军，卢俊宇，王友恒，吴娜.汽油机进气道及燃烧室结构优化与性能研究[J].内燃机工程,2020,41(5):62-69. |
| Research on Structural Optimization and Performance of Intake Port and Combustion Chamber of Gasoline Engine |
| DOI：10.13949/j.cnki.nrjgc.2020.05.009 |
| Key Words:gasoline engine computational fluid dynamics downsizing flow coefficient tumble ratio |
| Author Name | Affiliation | | HOU Xianjun, LU Junyu, WANG Youheng, WU Na | 1.Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan 430070, China
2.Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan University of Technology, Wuhan 430070, China
3.Hubei Research Center for New Energy & Intelligent Connected Vehicle, Wuhan University of Technology, Wuhan 430070, China |
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| Abstract:The performance of a single cylinder gasoline engine (0.375L) was improved by optimizing the structures of intake port and combustion chamber to achieve the purpose of downsizing. The CONVERGE software was used to simulate the steady state air flow in the intake port at different valve lifts and the combustion process at 3000r/min with full load. Four optimization schemes of intake port and three optimization schemes of combustion chamber were proposed respectively. Considering flow coefficient and tumble ratio comprehensively, the first scheme of intake port was selected. With the selected intake port, the average flow coefficient was increased by 22.26%, and the average tumble ratio was increased by 14.41%. The flow distribution, turbulence kinetic energy and mixture distribution of the second combustion chamber scheme could accelerate flame propagation speed and shorten fast combustion period after comprehensively analyzing the flow distribution, mixture distribution, temperature distribution, cylinder pressure and combustion parameters of different combustion chamber schemes based on the first intake port scheme. The indicated power of the second scheme of combustion chamber was increased by 14.1% compared to the base combustion chamber, and the power performance reached the level of the base engine (0.400L). |
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