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首先采用作者发展的滑移界面技术及非定常流数值方法计算了两同心圆柱间库特 (Cou ette)流动 ,在此基础上对叶轮及扩压器叶片数不等的二维离心式动、静相干叶排内部的非定常流动进行了数值模拟 ,详细分析了不同流量工况下动、静叶排内的非定常流动特性 .数值分析表明 ,在一定的转速下 ,非等栅距离心式动、静相干叶排内部的非定常流动结构与流量工况密切相关 ,当流量较小或者较大时 ,在叶片扩压器内都会产生大尺度的分离涡 ,而在叶轮内的涡尺寸较小或不出现 .研究结果可为优化叶轮与叶片扩压器的匹配提供有益参考 .
Firstly, the author developed the flow interface technique and unsteady flow numerical method to calculate the Cou ette flow between two concentric cylinders. On the basis of this, the two-dimensional centrifugal motion with different impeller and diffuser vanes, The unsteady flow in the stationary and stationary vane rows is numerically simulated, and the unsteady flow characteristics in the moving and stationary vane rows are analyzed in detail. The numerical analysis shows that at a certain rotating speed, The unsteady flow structure inside the moving and static coherent leaf banks is closely related to the flow conditions. When the flow rate is small or large, large-scale separation vortices will be produced in the leaf diffuser, while the vortex sizes in the impeller Small or not appearing.The research results can provide a useful reference for optimizing the matching of impeller and vane diffuser.