基于CFD的某型号空滤器数值模拟及结构改进

Numerical simulation and structure improvement of a certain type air filter based on CFD

应用Fluent流体力学计算软件,采用标准κ-ε湍流模型和标准壁面函数对空气滤清器的内部湍流流场进行三维仿真计算,其中滤芯部分采用多孔介质模型.经计算,得到在不同入口流量下的仿真结果,结果与实验数据基本一致,具有工程指导意义.为提高空气滤清器的流动均匀性,降低阻力损失,分别从进气管入口位置调整,排气管结构优化和滤网的改进3个方面提出改进方案.对比各改进方案,得出了进气管入口位置左移16mm,排气管端部弯道的直拐角改为圆滑拐角、滤纸的孔目数选择1000目的最终改进方案,此方案进出口静压差减小约13%,滤芯入口截面流动的均匀性也得到了提高.

Using the fluid software Fluent,standard κ-ε turbulent model and the standard wall function, the three-dimensional turbulent flow field in an air filter is numerically simulated,in which the filter is simulated by the porous model.The simulation results under various inlet flows are obtained after calculation.It is shown that simulation results agree with experimental results well basically;so the results have guiding significance in engineering.To improve the flow uniformity and reduce resistance losses of the air filter,different improved schemes are proposed in three aspects;namely,intake pipe inlet position adjust- ment,exhaust pipe structure optimization and filter part optimization.The final improved scheme is pro-posed by comparing various schemes.The inlet pipe position can be shifted to the left in 16mm;and the exhaust pipe should be connected in round corners instead of the straight corners;and the holes of the filter should be 1000.The final improved scheme can reduce 13%,of the static pressure difference and the flow uniformity in inlet cross-section of the filter part is improved too.