关键词: 径向流;流场仿真;多重网格法;时间推进法

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