Abstract: To accelerate the converging process of turbomachinery CFD and improve the calculation results, two new multi-grid schemes are used to calculate the internal flow field inside the radial turbomachinery The calculation of Krain H centrifugal impeller shows that the simulation results of the two methods are very similar and both fit fairly well with the measurement In addition, both methods greatly improve the converging speed while some difference exists between the two methods in converging process

Key words: Radial flow;Flow field simulation;Multiple grid scheme;Explicit time marching method

摘要： 为了加快数值求解叶轮机械内部流场的收敛速度 ,并改善计算结果 ,在数值求解径流叶轮机械可压流动的计算中 ,采用了由微元、二重和三重网格逐级转入和同时转入的两种多重网格法。对德国宇航局KrainH设计的离心压气机内部流场的数值计算表明 ,两种多重网格法的计算结果差别不大 ,尽管在收敛速度方面存在差异 ,但均与测量数据吻合比较好。

关键词: 径向流;流场仿真;多重网格法;时间推进法