Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (6): 1911-1919.doi: 10.13229/j.cnki.jdxbgxb20180922

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In⁃cylinder exergy destruction during combustion process ofheavy⁃duty turbocharged diesel engine

Chang-cheng LIU(),Zhong-chang LIU,Jing TIAN(),Yun XU,Ze-yu YANG   

  1. State Key Laboratory of Automotive Simulation and Control，Jilin University，Changchun 130022，China
  • Received:2018-09-10 Online:2019-11-01 Published:2019-11-08
  • Contact: Jing TIAN E-mail:liuchangcheng1@163.com;jingtian@jlu.edu.cn

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Abstract:

The purpose of this paper is to explore the distribution of in-cylinder exergy destruction and its influence factors in combustion process. A heavy-duty turbocharged diesel engine is taken as the research object to study exergy change rule, exergy destruction distribution in cylinder and its influence factors based on test platform, STAR-CD computational fluid dynamics software and subsequent theoretical calculation. The results show that first, exergy destruction in cylinder mainly happens in combustion process, the exergy destruction caused by chemical reaction and its proportion to in-cylinder exergy destruction are positively related with engine load at the same speed, the proportion is up to 94.5% at B75 working condition. Secondly, exergy destruction in cylinder of diesel engine is mainly caused by chemical reaction irreversibility and it mostly occurs at the edge of oil beam. Third, the largest chemical reaction exergy destruction rate happens in dense mixing zone whose equivalence ratio range is 1~1.5; however, the value is relatively low in dilute mixing region or denser mixing zone whose equivalence ratio is lower than 1 or greater than 1.5. With the development of combustion process, the reaction exergy destruction rate decreases gradually in different equivalence ratios zone. Fourth, in a certain temperature range, the chemical reaction exergy destruction rate is almost proportional to the heat release rate of fuel, and in a certain heat release rate region, the chemical reaction exergy destruction and its proportion of the fuel exergy gradually reduces with the temperature increase. Finally, as the combustion process proceeding, the relative intensity of equivalence ratio, temperature and chemical reaction exergy destruction decrease gradually.

Key words: power machinery and engineering, turbo-charged diesel engine, combustion process, in-cylinder exergy destruction, temperature, equivalent ratio

CLC Number: 

  • TK421

Table 1

Basic parameters of turbocharged dieselengine for test"

参 数数值
缸径/mm112
行程/mm145
压缩比17
总排量/L8.6
标定功率/kW257
标定转速/(r·min-1)2 100
单缸气门数/个4
气缸数/个6
进气方式增压-中冷
供油系统Bosch共轨控制系统

Table 2

Selection of computational model"

模型名称模型类型
湍流模型k-ε/RNG
着火模型Shell
雾化模型Huh
喷嘴模型MPI-2
液滴破碎模型Reitz/Diwakar
撞壁模型Bai
燃烧模型EBU LATCT
NOx排放预测模型Zeldovich
Soot排放预测模型Mauss

Fig.1

Simulation model validation at different working conditions"

Fig.2

Cumulative in-cylinder exergy destructionin combustion process under differentworking conditions"

Fig.3

Proportion of every part of exergy flowin fuel exergy"

Fig.4

Exergy destruction caused by chemical reaction and its proportion accounts for total exergydestruction in cylinder"

Fig.5

Thermal efficiency and specific fuelconsumption of diesel engine"

Fig.6

Exergy destruction distributions caused by chemical reaction in cylinder at B50"

Fig.7

Scatter plot of exergy destruction ratiocaused by chemical reaction-heatrelease ratio-temperatur"

Fig.8

Scatter plot of κ-temperature at ATDC 5 °CA"

Fig.9

Scatter plot of exergy destruction ratio caused by chemical reaction and equivalent ratio"

Fig.10

Variation of exergy destruction caused by chemical reaction under different equivalence ratios ranges at B50"

Fig.11

Correlation coefficient between temperature and exergy destruction caused by chemicalreaction"

Fig.12

Correlation coefficient between equivalenceratio and exergy destruction caused bychemical reaction"

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