|本期目录/Table of Contents|

[1]何邦全,李 晓.进气压力和喷油对二冲程汽油机稀燃特性的影响[J].燃烧科学与技术,2018,(02):111-119.[doi:10.11715/rskxjs.R201704016]
 He Bangquan,Li Xiao.Effects of Intake Pressure and Injection on the Combustion Characteristics of a Poppet-Valve Two-Stroke Direct Injection Gasoline Engine in Lean Conditions[J].Journal of Combustion Science and Technology,2018,(02):111-119.[doi:10.11715/rskxjs.R201704016]
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进气压力和喷油对二冲程汽油机稀燃特性的影响()
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《燃烧科学与技术》[ISSN:1006-8740/CN:12-1240/TK]

卷:
期数:
2018年02
页码:
111-119
栏目:
出版日期:
2018-04-15

文章信息/Info

Title:
Effects of Intake Pressure and Injection on the Combustion Characteristics of a Poppet-Valve Two-Stroke Direct Injection Gasoline Engine in Lean Conditions
文章编号:
1006-8740(2018)02-0111-09
作者:
何邦全李 晓
天津大学内燃机燃烧学国家重点实验室,天津300072
Author(s):
He BangquanLi Xiao
State Key Laboratory of Engines,Tianjin University,Tianjin 300072,China
关键词:
二冲程汽油机稀混合气燃烧数值模拟
Keywords:
two strokegasoline enginelean mixturecombustionnumerical simulation
分类号:
TK411.2
DOI:
10.11715/rskxjs.R201704016
文献标志码:
A
摘要:
利用三维数值模拟软件CONVERGE 研究了在循环喷油量和点火时刻固定的大负荷条件下,进气压力对二冲程直喷汽油机缸内燃油分布和稀燃特性的影响.结果表明,在相同的第2 次喷油比例下,随着进气压力的升高,气缸内燃油浓度降低.在相同的进气压力下,随着第2 次喷油比例的增加,火花塞附近的燃油浓度先减小后增加.在第2 次喷油比例为70%,时燃油分层形式最有利于燃烧.在相同的第2 次喷油比例下,随着进气压力的升高,着火时刻逐渐提前,燃烧持续期先略有缩短后又增长,最大压力升高率先增加后减小.在相同的进气压力下,随着2 次喷油比例的增加,着火时刻先略有推迟后提前,燃烧持续期先增长后缩短,最大压力升高率先减小后增加.气缸内燃油浓度和温度分层形式影响火焰传播过程中气缸周围混合气的自燃特性.提高进气压力能降低气缸周围混合气的浓度,抑制自燃的发生.
Abstract:
The effect of intake pressure on fuel distribution and combustion characteristics in a poppet-valve twostroke direct injection gasoline engine with lean mixture at high loads was simulated with a 3-dimentional computational fluid dynamic CONVERGE software.Simulation results show that with the increase of intake pressure,the average fuel-air equivalent ratio in the cylinder decreases at a fixed ratio of the second injection to the total.With the increase of the second injection ratio at fixed intake pressure,the fuel-air equivalent ratio around spark plug first slightly decreases and then rises.At the second injection ratio of 70%,the fuel distribution is prone to combustion. With the increase of intake pressure at a given second injection ratio,ignition timing advances, combustion duration slightly decreases first and then increases while the maximum pressure rise rate first rises and then drops.With the increase of the second injection ratio at given intake pressure,ignition timing slightly delays first and then advances,combustion duration first increases and then decreases while the maximum pressure rise rate drops first and then decreases.The fuel concentration and temperature stratification in the cylinder affect autoignition in the cylinder.High intake pressure can prevent the occurrence of auto-ignition through decreased fuel-air equivalent ratio around the cylinder.

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备注/Memo

备注/Memo:
收稿日期:2017-05-08. 基金项目:国家重点基础研究发展计划(973计划)资助项目(2013CB228403). 作者简介:何邦全(1964— ),男,博士,副教授. 通讯作者:何邦全,bqhe@tju.edu.cn.
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