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.