改进的Qiu滑移因子模型用于离心压气机叶轮的参数研究

为适用于微型离心压气机叶轮的通流设计,对Qiu滑移因子模型加入了3个经验参数.首先对经验参数的求解方法及参数对于设计精度的影响进行了分析研究,发现其中经验参数cr对于设计精度影响较大.其次在通流设计中应用改进的Qiu滑移因子模型辅助生成叶片,用计算流体动力学(CFD)研究了cr所影响的模型滑移因子,与数值流场的出口平均滑移因子对比,得到了多种叶轮总体参数下cr的最佳取值.发现虽然微型、大型离心压气机叶轮总体参数变化范围很大,但cr的取值均以0.7左右为其最佳值.

Parametric research on improved Qiu slip factor modelfor centrifugal compressor impellers

To adapt the slip factor model proposed by Qiu to the through-flow design of micro-centrifugal impellers, three empirical parameters were introduced to reduce the system error. Firstly, the solving method of these empirical parameters and the impact on the design accuracy were researched. It is seen that empirical parameter c_r influences the design accuracy greatly. Secondly, with employment of the improved Qiu slip factor model, a micro-centrifugal impeller was designed. The predicted slip factors impacted by c_r in the model were compared with the impeller-outlet-averaged slip factors resulted from the CFD flow field simulation. The most suitable values of c_r were found at different prescribed design overall parameters. It is found that c_r nearby 0.7 has a best estimation, though the overall parameters of micro- or large-centrifugal compressor impeller vary widely.