对一台单级高负荷向心透平进行了三维黏性定常和非定常计算,计算得到的动叶出口以及下游的周向平均流场与文献提供的实验结果符合良好。在此基础上对流动的非定常特性进行了分析,发现由于动叶转速较高,且动叶下游不存在下一级静叶的干涉,流动的非定常效应主要体现在叶片排之间的区域以及动叶通道进口,动叶出口以及下游流动的非定常特性并不明显。非定常计算结果透平的级效率随时间的波动幅度达到了1.3%。
The flow field in a single stage,high load radial turbine is investigated numerically using 3D viscous steady and unsteady simulations.The azimuthal averaged flow fields predicted by the simulations compare well with experimental results from open literature.The analysis of the results is focused on unsteady interaction between the vane and rotor.Due to the high rotating speed of the rotor and lack of downstream stator,the unsteady phenomena are obvious mainly around the vane-rotor interface and the inlet part of the rotor passage.The flow at the outlet part and downstream of the rotor does not show obvious unsteady fluctuations.The unsteady simulation shows that the stage efficiency has a variation with time up to 1.3%.
参考文献
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