螺旋进气道设计参数对涡流比影响的数值分析

采用计算流体力学软件Converge对一款车用柴油机进行了气道和缸内流动的数值计算,主要研究柴油机螺旋进气道结构设计参数对缸内涡流比的影响.通过修改螺旋进气道的3个主要结构设计参数,研究了其对缸内涡流比的影响规律.结果表明:当单独改变螺旋室高度、涡壳切割量以及螺旋进气道转角3个结构设计参数,使其取值分别为13mm,1.27mm以及0°时,缸内涡流比获得最大值;同时修改多个结构设计参数时,其对涡流比的影响存在相互制约的作用;通过Converge软件实现了螺旋进气道多结构参数的数值研究,对实际气道的设计具有重要的指导意义.

Numerical Analysis of the Effects of the Design Parameters of a Diesel Helical Intake Port on the Swirl Ratio

To study the effects of the design parameters of a helical intake port on the in-cylinder swirl ratio for an automotive diesel engine,the transit port and in-cylinder flows were simulated with the Converge CFD software.By changing the values of three main design parameters of the intake port,their effects on the in-cylinder swirl ratio were simulated and studied.The results have shown that the in-cylinder swirl ratio achieved the maximum values when the spiral chamber height,the vortex shell cut-off amount and the helical intake port angle were changed to the values of 13 mm,1.27 mm and 0 degree,respectively.The results also indicated that the effects of the parameters on the swirl ratio were not additive when multiple parameters were varied at the same time.This study has shown that the numerical analysis of multiple design parameters of a helical intake port can be done with the use of the Converge software.