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International Journal of Automotive Technology > Volume 23(4); 2022 > Article
International Journal of Automotive Technology 2022;23(4): 1055-1063.
doi: https://doi.org/10.1007/s12239-022-0092-0
INFLUENCE OF HEAT TRANSFER OF COMBUSTION CHAMBER WALL ON THE PERFORMANCE OF GASOLINE ENGINE BASED ON POLISHING TECHNOLOGY UNDER DIFFERENT COMPRESSION RATIO AND AIR-FUEL RATIO
Zijun Zheng 1, Zhaoming Huang 2, Tao Wang 3, Li Wang 2, Hong Chen 4, Weiguo Chen 5
1School of Mechanical and Electrical Engineering, Zhejiang Business Technology Institute
2School of Mechanical Engineering, Wanjiang University of Technology
3School of Mechanical Engineering, Nanjing University of Science and Technology
4School of Mechanical Engineering, University of Shanghai for Science and Technology
5Automotive Engineering & Technology Research Institute, Chery Automobile Co., Ltd.
PDF Links Corresponding Author.  Zhaoming Huang  , Email. wt15026@wjut.edu.cn
ABSTRACT
On a single-cylinder gasoline engine test bench, the experimental study of the effects of polishing the combustion chamber wall and piston top surface on the indicated thermal efficiency and combustion characteristics were carried out, and the mutual influence of combustion phase, combustion duration and indicated thermal efficiency before and after polishing the wall of combustion system was systematically analyzed. The results show that when the single-cylinder gasoline engine operates at stoichiometric air-fuel ratio, low load and low compression ratio, the heat transfer loss of the polished combustion chamber is reduced and the fuel economy is improved, and the indicated thermal efficiency is increased from 40.8 to 42.2 %. With the increasing of load and compression ratio, the knock effect caused by the reduction of heat transfer loss after polishing is enhanced, and the combustion phase is delayed and the combustion duration is prolonged, which eventually leads to the decrease of the indicated thermal efficiency. After combustion chamber polishing, HC and NOx decrease by up to 70 %. With the increase of compression ratio, HC emission gradually increases, while NOx emission gradually decreases. There is no obvious change trend of CO emission before and after polishing. When the gasoline engine operates in lean combustion mode, the indicated thermal efficiency increases effectively, and the highest thermal efficiency exceeds 45 %; When the gasoline engine operates at indicated mean effective pressure of 1.05 MPa, the reduction of heat transfer loss in the combustion chamber after polishing enhances the knocking tendency, resulting in the overall decrease of the gross indicated thermal efficiency compared with that before polishing.
Key Words: Gasoline engine, Performance, Gross Indicated thermal efficiency, Combustion chamber, Polishing
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