离心风机蜗壳进口周向来流的非均匀性对其旋涡流动影响的数值研究

运用CFD技术对一离心风机整机作数值模拟，研究了蜗壳进口周向非均匀来流对其内旋涡结构、演化过程的影响．计算结果表明，蜗壳内各径向截面上产生了3个旋涡，一个进口涡和一对梯形涡，且都经历了初生、发展、耗散和溃灭等过程．与单蜗壳在周向均匀来流的假设下计算所得的旋涡结构相比，两者存在很大的差别，这说明只有考虑蜗壳来流的非均匀性影响，才能比较准确地模拟其内的旋涡运动．

Numerical investigation on the swirling flow inside a volute influenced by distorted inflow

A numerical investigation for a centrifugal blower is implemented to study the swirling flow influenced by distorted flow at volute's inlet. The distorted inflow is given out by computation, when the mathematical model involves the whole machinery. Three different vortices including inlet vortex and a pair of trapezoid vortices are captured in several prescribed radial cross sections of volute. Each vortex experiences its own developing process, which contributes to explain the loss variation in volute. As compared with the swirling flow calculated according to a uniform inflow of volute, the swirling flow influenced by a distorted inflow of volute is quite different from that, which concludes that more appropriate numerically results can be obtained in consideration of the distorted inflow of volute.