径向进气室对叶轮性能影响的数值研究

Numerical Simulation Research of the Impact of Radial Inlet Chambers on the Performance of Impellers

在保证子午面结构不变的前提下,设计了两个径向进气室方案。采用CFD对径向进气室与首级叶轮进行了流场分析,并且与轴向进气方案进行了比较。结果显示,径向进气室会造成叶轮进口流动的畸变,导致首级叶轮的效率和压比下降;同时,径向进气室的性能与几何形状关系密切。

Two radial inlet chamber are designed to ensure the meridian plane structure is unchangeable. The flow field of the radial inlet volute and first stage impeller was analyzed with CFD, and was then compared to the case of axial air inflow design. The results indicated that radial inlet chambers can cause flow distortions in the impeller＇s inlet, that will decrease efficiency and first stage impeller pressure ratio. Meanwhile, it proved that the performance of radial chambers have close relations to geometry shape.