Effects of Compression Ratio and Combustion Chamber Shape on Fuel Economy of Commercial Vehicle Diesel Engine
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LI Juncheng; ZENG Lili; WEI Hongling; TIAN Chong

doi:10.3969/j.issn.1001-2222.2022.03.011

Vehicle Engine ›› 2022, Vol. 0 ›› Issue (3) : 76-81. DOI: 10.3969/j.issn.1001-2222.2022.03.011

Effects of Compression Ratio and Combustion Chamber Shape on Fuel Economy of Commercial Vehicle Diesel Engine

LI Juncheng，ZENG Lili，WEI Hongling，TIAN Chong

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Abstract

In order to improve the fuel economy of commercial vehicle diesel engine, three-dimensional simulation model of in-cylinder combustion was built to study the effects of compression ratio and combustion chamber shape on fuel economy. Then pistons were manufactured and tested according to the simulation results. The results show that the fuel economy of different chamber shapes has different sensitivity to nozzle tip protrusion. Under the constant cycle pressure peak, the fuel economy will not improve only by increasing the compression ratio without increasing the heat release rate of chamber, and the fuel consumption will reduce by increasing compression ratio coupling with optimizing the chamber shape to shorten the combustion duration. Increasing the compression ratio can reduce fuel consumption effectively by combining with increasing the cycle pressure peak, and a high compression ratio chamber can achieve a better balance between fuel consumption reduction and NO_x emission control. The experimental measurement verifies the simulation. The BSFC of CR18.6 chamber with a high compression ratio is lower than that of CR16.8 base chamber. The BSFC and NO_xemission of CR18.6 reduce by 1.42% and 4.58% respectively at full load of 1 300 r/min.

Key words

diesel engine / fuel economy / compression ratio / combustion chamber / numerical simulation

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LI Juncheng，ZENG Lili，WEI Hongling，TIAN Chong. Effects of Compression Ratio and Combustion Chamber Shape on Fuel Economy of Commercial Vehicle Diesel Engine [J]. Vehicle Engine. 2022, 0(3): 76-81 https://doi.org/10.3969/j.issn.1001-2222.2022.03.011