气-固耦合设计对斜流叶轮性能影响的数值分析

为了获得在设计工况下性能最佳的叶型,提出一种三维单向气-固耦合迭代设计方法。对三维气动设计得到的热态叶型（记为RT)进行单向气-固耦合计算,获得设计点流场特性和热态叶型变形量。采用基于面积平均的三维插值造型方法,分别获得进行机匣处理和不进行机匣处理的冷态叶轮(分别记为RC和RC-tip)。对冷热态叶轮流场的数值分析结果表明:与热态叶轮相比,冷态叶轮在设计转速下堵塞点流量提高1.93%；冷态叶轮的叶片最小负荷下降约30%；在低转速下,冷态叶轮的性能曲线优于热态叶轮；说明通过该设计流程得到的冷态叶轮在叶片负荷和流通能力等方面实现了优化。 

Numerical analysis of effect of gas-solid coupled design on oblique impeller performances

A one-way three dimensional gas-solid coupled design method was proposed to obtain the optimized performance blade profile at the design point. The original thermal state blade profile (denoted as RT) designed by the aerodynamics was used for calculating the flow field characteristics and deformation through one way coupled method. Then two revised cold state blade profiles with and without casing treatment (denoted as RC and RC-tip) through an area-averaged 3D interpolation modeling method were obtained. Results indicated that the flow rate of RC-tip impeller at choke point improved 1.93% under designed speed. The minimum blade loading also dropped by 30%. At low speed, performance of RC-tip was obviously better than that of RT, proving that the coupled design method optimized the blade loading and flow capacity of oblique impeller.