高增压柴油机进气流动理论研究  

Intake Flow Theory of High-Boosted Diesel Engine

作　　者：文明 李玉峰 贾孟秋 鲁祯[1] 王天友[1] WEN Ming;LI Yufeng;JIA Mengqiu;LU Zhen;WANG Tianyou(State Key Laboratory of Engines,Tianjin University,Tianjin 300072,China;China North Engine Research Institute(Tianjin),Tianjin 300400,China)

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072 [2]中国北方发动机研究所(天津),天津300400

出　　处：《车用发动机》2021年第1期75-81,共7页Vehicle Engine

基　　金：国家自然科学基金项目(51476151)。

摘　　要：柴油机增压比大幅度提高以后,进气压差和空气密度将显著增大。针对一台高增压单缸柴油机,通过仿真方法分析了两个典型转速下不同增压比对进气射流和缸内流动的影响规律,并对高增压柴油机进气流动进行了理论分析。研究发现:高增压柴油机在相同转速下的进气射流速度及其分布几乎不随增压比的增加而变化,缸内涡流比、湍动能等宏观和微观速度场特征参数也几乎不随增压比的提高而变化,原因是进气流动速度受限于平均活塞运动速度,进气质量的增加主要源自于空气密度的增加。The intake pressure difference and air density would significantly increase after the significant increase of diesel engine boost ratio.The effects of different boost ratios on intake jet velocity and in-cylinder flow were conducted on a high-boosted single-cylinder diesel engine under two typical speeds through the simulation method.And the intake flow of the high-boosted diesel engine was analyzed theoretically.The results show that the intake jet velocity and its distribution as well as the macro and micro velocity field parameters such as in-cylinder swirl ratio and turbulent kinetic energy hardly change with the increase of boost pressure at the same speed.The reason is that the intake jet velocity is affected by the average piston reciprocating movement velocity and the increase of intake air mass depends mainly on the increase of air density.

关 键 词：高增压 柴油机 进气流动 缸内流动 

分 类 号：TK423.3[动力工程及工程热物理—动力机械及工程]