湍流
机械
涡轮机
流量(数学)
自由面
水轮机
计算机模拟
扭矩
热工水力学
工程类
机械工程
物理
传热
热力学
作者
Yexiang Xiao,Zhengwei Wang,Zhang Jin,Chongji Zeng,Zongguo Yan
标识
DOI:10.1177/0957650913506711
摘要
Unlike the reaction turbines, the hydraulic performance of Pelton turbines varies due to the unsteady flow of the rotating buckets in time and space. This study experimentally and numerically investigates the dynamic performance of a Pelton turbine at five different operating conditions. The unsteady numerical simulations were performed with the SST turbulence model. The three-dimensional unsteady free surface sheet flow behavior in the rotating buckets was modeled by the two-phase homogeneous model. The model was used to analyze the dynamic flow patterns and the torque variations as the buckets rotated. The predicted hydraulic performance at different unit discharge rates are compared with the field test while the free surface flow patterns are compared with previous experimental and numerical results. The predicted relative efficiency agrees well with the field test results. The calculations were used to clarify the hydraulic mechanisms with unsteady free surface sheet flow in the rotating bucket.
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