基于双向流固耦合的冷却风扇气动性能仿真分析

Simulation Analysis of Aerodynamic Performance of Cooling Fan Based on Two-way Fluid-structure Coupling

发动机冷却风扇在工作过程中,由于叶片表面压力存在一定的结构变形会对风扇的气动性能产生影响,尤其对大尺寸、高负荷风扇的影响更大。基于Ansys Workbench软件,采用双向流固耦合方法对某型号发动机用冷却风扇的气动性能进行了计算分析,并将其结果和不考虑风扇变形的CFD方法得到的风扇气动性能结果与试验值进行了对比。结果表明:考虑了风扇变形因素的双向流固耦合仿真得到的结果更接近于试验值;采用双向流固耦合方法对风扇气动性能进行计算,可显著降低计算值与试验值的偏差。

During the working process of the engine cooling fan,there are structural deformations due to the surface pressure of the blade,which affects the aerodynamic performance of the fan,especially for large-sized and high-load fans.Based on Ansys Workbench,the two-way fluid-structure coupling method was used to calculate and analyze the aerodynamic performance of a certain type of engine cooling fan.The results were compared with the results obtained by the CFD method without considering the fan deformation and the experimental values.The results show that the results of the two-way fluid structure coupling simulation considering the fan deformation factor are closer to the test values.The two-way fluid-structure coupling method is used to calculate the aerodynamic performance of the fan,which can significantly reduce the deviation between the calculated value and the experimental value.