任意空间曲面三元叶轮叶片厚度对气动性能的影响

以任意空间曲面三元闭式叶轮为对象,研究了不同展向和流向叶片厚度分布方案对离心压缩机气动性能的影响。数值结果表明:对等厚叶片沿展向和流向进行合理地削薄,均能在基本不改变小流量工况性能的情况下,显著提升大流量工况的性能。展向削薄叶片和流向削薄叶片带来的性能提升幅度可以叠加,通过组合叶片厚度分布改型,本文压缩机设计工况点等熵效率提升了约2.08%。相比于沿流向削薄前缘和尾缘厚度,沿展向削薄叶尖厚度具有更大的性能提升能力。研究工作为三元闭式离心压缩机叶轮的优化设计提供了有益的参考。

Effect of Blade Thickness on Aerodynamic Performance of Three-dimensional Impeller With Arbitrary Spatial Surface

The influence of different spanwise and streamwise blade thickness distribution schemes on the aerodynamic performance of shrouded centrifugal compressors with arbitrary spatial surfaces was studied.The numerical results show that the reasonable thinning for the equal-thickness blades along spanwise and streamwise direction can both significantly improve the compressor performance at high flow operating conditions without obviously reducing the performance at low flow operating conditions.The performance improvement obtained by the spanwise blade thinning and the streamwise blade thinning could be superimposed.The isentropic efficiency of the compressor at the design condition was improved by about 2.08%by combining the spanwise and the streamwise blade thinning.Compared to the thickness thinning of the leading edge and the trailing edge of the blade,the thinning of the blade tip thickness had a greater performance improvement capability.The research work provides a useful guidance for the optimal design of the three-dimensional shrouded centrifugal compressor impeller.