结构参数对天然气发动机缸内直喷装置射流特性的影响研究  

Study on the influence of structural parameters on jet characteristics of natural gas engine direct injection device

作　　者：陈晶 王天波 王鸿晨 王煜 王成敏 巩武 CHEN Jing;WANG Tianbo;WANG Hongchen;WANG Yu;WANG Chengmin;GONG Wu(School of Automotive and Traffic Engineering,Jiangsu University of Technology,Changzhou 213001,China)

机构地区：[1]江苏理工学院汽车与交通工程学院,江苏常州213001

出　　处：《江苏理工学院学报》2025年第1期43-51,共9页Journal of Jiangsu University of Technology

基　　金：国家自然科学基金项目“基于系统定量评价机制的气体燃料缸内掺混效果混杂定量解耦研究”(52105260);常州市科技支撑计划(社会发展)“燃气分布式能源电站内燃机缸内掺混过程混合定量解耦研究”(CE20225049);江苏省青蓝工程基金;江苏理工学院研究生实践创新计划项目“天然气发动机CFD建模掺混过程评价机制和定量优化”(XSJCX22_47)。

摘　　要：对于缸内直喷天然气(Natural Gas,NG)发动机而言,天然气喷射装置的射流特性对发动机缸内掺混效果乃至燃烧效率等都有着至关重要的作用。为改善缸内燃料与空气混合效果、提高发动机性能,基于计算流体力学方法,探究喷射装置阀门升程、阀门直径以及直径/升程比对天然气射流特性的影响规律。研究结果表明:喷射装置阀门升程对喉口近场射流特性的影响较为显著;阀门直径变化将直接影响缸内天然气射流体积占比,从而对射流贯穿距离产生影响;在固定阀门直径/升程比条件下,天然气射流发展呈现高度自模性的规律;对比多组阀门射流贯穿常数,其中,锥形阀门射流贯穿常数为0.12~0.17。For the direct injection of natural gas(NG)engine,the jet characteristics of the natural gas injection device have a crucial role in the engine cylinder mixing effect and even combustion efficiency.In order to improve the mixing effect of fuel and air in cylinder and improve engine performance,the effects of valve lift,valve diameter and diameter/lift ratio on natural gas jet characteristics are investigated based on computational fluid dynamics method.The results show that the valve lift of the injection device has a significant effect on the near-field jet characteristics of the throat.The change of valve diameter will directly affect the volume proportion of natural gas jet in the cylinder,thus affecting the jet penetration distance.Under the condition of fixed valve diameter/lift ratio,the development of natural gas jet shows the law of high self-modularity.Compared with other groups of valve jet penetration constant,the conical valve jet penetration constant is 0.12~0.17.

关 键 词：天然气喷射装置 缸内直喷 阀门直径 阀门升程 射流特性 自模性 

分 类 号：U464[机械工程—车辆工程]