Experimental and numerical analysis of blade channel vortices in a Francis turbine runner
Experimental and numerical analysis of blade channel vortices in a Francis turbine runner
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DOI：
10.1108/02644401111109204
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发表时间：
2011-03
影响因子：
1.6
通讯作者：
X. Yexiang;W. Zhengwei;Yan Zongguo
中科院分区：
文献类型：
--
作者：
X. Yexiang;W. Zhengwei;Yan Zongguo
目的：本文的目的是通过实验和数值研究中等流量水头混流式水轮机转轮的压力脉冲特性和非定常流动特性。对中高水头流道内的压力脉冲进行了数值预测。利用计算结果划分了涡轮的工作区域，明确了非定常流动特性的变化，特别是转道内叶片通道涡的变化。设计/方法/方法-对混流式水轮机转轮中速水头压力脉冲特性进行实验和数值分析，然后通过数值模拟将其扩展到高水头，并在多种工况下进行三维非定常数值模拟。采用非定常Reynolds - average Navier - Stokes方程和基于k - ω的剪切应力输运湍流模型，对混流式水轮机整个流道内的非定常流动进行了模拟。调查结果-主要频率…
Purpose – The purpose of this paper is to investigate, experimentally and numerically, the pressure pulse characteristics and unsteady flow behavior in a Francis turbine runner for moderate flow heads. The pressure pulses in the runner blade passage were predicted numerically for both moderate and high heads. The calculations were used to partition the turbine operating regions and to clarify the various for the unsteady flow behavior, especially the blade channel vortex in the runner.Design/methodology/approach – Experimental and numerical analyses of pressure pulse characteristics at moderate flow heads in a Francis turbine runner were then extended to high heads through numerical modeling with 3D unsteady numerical simulations performed for a number of operating conditions. The unsteady Reynolds‐averaged Navier‐Stokes equations with the k‐ω‐based shear stress transport turbulence model were used to model the unsteady flow within the entire flow passage of a Francis turbine.Findings – The dominate frequ...