韩伟,李雪峰,陈昊,王洁,陈雨
HAN Wei,LI Xue-feng,CHEN Hao,WANG Jie,CHEN Yu

• 1:兰州理工大学
• 2:甘肃省流体机械及系统重点实验室

摘要(Abstract)：

以径向导叶式离心泵反转作液力透平为研究对象,对全流道进行结构化六面体网格划分,运用大涡模拟(large eddy simulation,LES)模型进行三维非定常数值计算,分析了透平工况下动静叶栅内的压力分布、内部速度场、流道涡量分布、拟序涡流结构及演化过程。结果表明:所选的径向导叶式离心泵作透平时水力性能良好,动静叶栅交界面附近出现局部高压和局部高速流,非定常流动时动静叶栅内涡旋运动明显,流道内涡量主要分布在导叶工作面和叶片背面,伴随着叶轮旋转产生的涡在流道内会出现拉伸、合并和撕裂的演化形式。
A centrifugal pump with radial diffuser was chosen as turbine,and then the unsteady 3D flow field was simulated based on the large-eddy simulation(LES) turbulence model with structured hexahedral mesh generated in ICEM.The pressure distribution,internal velocity field,flow channel vorticity distribution,the pattern and the evolution process of coherent vortexes in the two cascades were analyzed.The results show that the centrifugal pump with radial diffuser selected as turbine has a good hydraulic performance.Local high pressure and high speed flow appear in the vicinity of the interface between the stator and rotor,and vortex motion can be observed in the stator-rotor cascades under unsteady condition,the vorticity of the flow channel mainly distributed on the working surface of guide blades and the back surface of impeller blades,the vortexes produced with the rotating impeller experienced a series of evolution process,namely stretching,merging and tearing in the flow channel.

关键词(KeyWords)： 液力透平;动静叶栅;拟序涡结构演化
hydraulic turbine;stator-rotor cascades;evolution process of vortex

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(51579125)

作者(Author): 韩伟,李雪峰,陈昊,王洁,陈雨
HAN Wei,LI Xue-feng,CHEN Hao,WANG Jie,CHEN Yu

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