压缩天然气缸内直喷发动机喷射方式对混合气形成及燃烧特性影响的模拟

doi:10.13229/j.cnki.jdxbgxb20161032

吉林大学学报(工学版) ›› 2018, Vol. 48 ›› Issue (3): 735-743.doi: 10.13229/j.cnki.jdxbgxb20161032

压缩天然气缸内直喷发动机喷射方式对混合气形成及燃烧特性影响的模拟

江涛¹, 林学东¹, 李德刚¹, 顾静静^1,2

1.吉林大学汽车仿真与控制国家重点实验室,长春 130022;
2.联合汽车电子有限公司,上海201206;

收稿日期:2016-09-19 出版日期:2018-05-20 发布日期:2018-05-20
通讯作者: 李德刚(1976-),男,副教授,博士研究生.研究方向:内燃机燃烧过程优化及其控制技术.E-mail:ldg@jlu.edu.cn
作者简介:江涛(1989-),男,博士研究生.研究方向:内燃机燃烧过程优化及其控制技术.E-mail:812564449@qq.com
基金资助:
吉林省科技发展计划项目(20150101032JC); 吉林省发改委产业技术研究与开发项目(2014Y093).

Simulation of effect of injection method in compressed natural gas direct injection(CNG-DI) engine on formation mechanism of mixed gas and combustion characteristics

JIANG Tao¹, LIN Xue-dong¹, LI De-gang¹, GU Jing-jing^1,2

1.State Key Laboratory of Automotive Simulation and Control, Jilin University,Changchun 130022,China;
2.United Automotive Electronic Systems Co., Ltd., Shanghai 201206,China

Received:2016-09-19 Online:2018-05-20 Published:2018-05-20

摘要/Abstract

摘要： 利用FIRE软件仿真分析了将压缩天然气(CNG)燃料按不同喷射方式直接喷入气缸时对微观物理场及火焰传播机理和NO生成规律的影响。结果表明:CNG燃料的混合气形成机理取决于其喷入气缸后相对缸内空气的分离速度,喷射时刻通过控制喷射过程中向气缸喷入的动能来抑制天然气相对空气的分离速度,从而决定浓度场的分布;当早期喷射时缸内易形成上浓下稀的浓度分布,晚喷射时则易形成下浓上稀的混合气;NO的生成速率取决于当时当地的一定的混合气浓度和温度,当当量比或温度偏离某一范围时NO生成速率几乎为零;而NO的最终生成量取决于NO的生成速率、生成区域面积的大小以及生成反应持续时间。

关键词: 动力机械与工程, 压缩天然气直喷发动机, 喷射方式, 混合气形成机理, 燃烧特性

Abstract: The effects of different direct injection methods of compressed natural gas(CNG) fuel into the cylinder on the microscopic physical fields, the flame propagation mechanisms and the NO formation mechanism were simulated and analyzed using software FIRE. The results show that, after injection the formation mechanism of CNG fuel mixture depends on its separation speed relative to the air in the cylinder, and the separation speed of CNG is controlled effectively by the injection timing according to the kinetic energy provided by gas fuel during the injection, which determines the distribution of concentration fields. During the compression stroke, the concentration distribution rises from the bottom to the top if the fuel was injected early and vice versa. The NO formation rate depends on the concentration and temperature of local mixture. The NO formation rate is almost 0 regardless of equivalence ratio when temperature is lower than 2000 K. The amount of NO production depends on the NO reaction rate, the size of production area and the reaction duration.

Key words: power mechinery and engineering, compressed natural gas direct injection(CNG-DI) engine, injection methods, mixture formation mechanism, combustion characteristic

中图分类号:

TK421.2

江涛, 林学东, 李德刚, 顾静静. 压缩天然气缸内直喷发动机喷射方式对混合气形成及燃烧特性影响的模拟[J]. 吉林大学学报(工学版), 2018, 48(3): 735-743.

JIANG Tao, LIN Xue-dong, LI De-gang, GU Jing-jing. Simulation of effect of injection method in compressed natural gas direct injection(CNG-DI) engine on formation mechanism of mixed gas and combustion characteristics[J]. 吉林大学学报(工学版), 2018, 48(3): 735-743.

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压缩天然气缸内直喷发动机喷射方式对混合气形成及燃烧特性影响的模拟

Simulation of effect of injection method in compressed natural gas direct injection(CNG-DI) engine on formation mechanism of mixed gas and combustion characteristics

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