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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

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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.

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Acknowledgement

The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: Thanks for the funding of projects of Open Fund Project of Maanshan Engineering Technology Research Center of Advanced Design for Automotive Stamping Dies (Grant number: QMSG202101, QMSG202102), Academic support project for top talents of subjects (majors) in Colleges and Universities and Key project of Natural Science Research of Anhui Provincial Department of Education (Grant number: KJ2020A0837).

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Correspondence to Zhaoming Huang.

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Zheng, Z., Huang, Z., Wang, T. et al. 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. Int.J Automot. Technol. 23, 1055–1063 (2022). https://doi.org/10.1007/s12239-022-0092-0

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