进气管口压力对流动阻力影响的数值模拟  

Numerical Simulation of the Effect of Nozzle Pressure on Flow Resistance of Intake Manifold

作　　者：杨然 Ran Yang(College of Mechanical Engineering,University of Shanghai for Science and Technology,Shanghai)

机构地区：[1]上海理工大学机械工程学院,上海

出　　处：《建模与仿真》2024年第5期5616-5622,共7页Modeling and Simulation

摘　　要：发动机进气过程中,气体在压力差的作用下被吸入气缸,通常压力差越大,进气越充分,但两者的关系并不是线性增长的。为了给发动机匹配合适的增压器,使进气压力被充分利用,提高发动机的充气效率。本文采用CFD方法对某1.6 L发动机的进气歧管在不同管口压力下的流动阻力进行数值模拟,分析结果显示:歧管内部的流动损失随着管口压力的增大而增大,但其增高率随着管口压力的增加而减少,从0.10~0.15 MPa区间到0.15~0.20 MPa区间转变时压损率明显降低。管口压力对充量系数的影响与压损相似。During the intake process of the engine,gas is sucked into the cylinder under the pressure difference.Usually,the larger the pressure difference,the more sufficient the intake is.However,the relationship between the two is not linear.In order to match the engine with a suitable turbocharger,fully utilize the intake pressure and improve the engine’s inflation efficiency.This article uses the CFD method to numerically simulate the flow resistance of the intake manifold of a 1.6 L engine under different nozzle pressures.The analysis results show that the flow loss inside the manifold increases with the increase of the manifold pressure,but its increase rate decreases with the increase of the nozzle pressure.When the pressure changes from 0.10~0.15 MPa to 0.15~0.20 MPa,the pressure loss rate decreases significantly.The influence of nozzle pressure on the filling coefficient is similar to that of pressure loss.

关 键 词：进气歧管 CFD 压力损失 

分 类 号：TK4[动力工程及工程热物理—动力机械及工程]