不同计算方法在轴流式风机数值模拟中的应用

基于MRF定常计算和SM非定常计算方法，对某轴流式风机进行了设计工况下的数值模拟。讨论了不同计算方法边界条件设置和收敛性判定的区别，分析了计算方法对风机全压效率的影响，研究了风机内部流场动静交界面上的静压分布、50%叶高截面静压和速度分布、叶片表面压力分布和叶轮出口动压分布等参数。数值结果表明，定常计算结果和非定常计算结果具有相同的变化趋势，但是存在一定的差异，这主要是由于定常计算没有考虑风机内部流动的非定常效应造成的；非定常计算能够更好地模拟动静交界区域的流动，比采用定常计算具有更好的数值结果。

Application of Different Numerical Simulation Methods in Axial-Flow Fan

An axial-flow fan was simulated on design-condition by CFD software based on MRF steady modeling and Sliding Mesh unsteady modeling. The difference of boundary conditions and convergence determination were discussed. The effect of different simulation methods on the efficiency performance of the axial-flow fan and several parameters, such as static pressure distribution at dynamic and static interface, static pressure and velocity distribution of 50% blade section, blade surface pressure distribution and impeller outlet dynamic pressure distribution, internal flow were also discussed. The results show that the steady simulation has the same trend with unsteady simulation, but it has a little difference. It mainly due to the steady calculation does not consider the unsteady effect of internal flow of fan. The unsteady calculation can simulate the flow at dynamic and static interface and has better effects than steady simulation.