Three-dimensional transient simulation of a prototype pump-turbine during normal turbine shutdown
Three-dimensional transient simulation of a prototype pump-turbine during normal turbine shutdown
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DOI：
10.1080/00221686.2016.1276105
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发表时间：
2017-03
影响因子：
2.3
通讯作者：
Zhongjie Li;H. Bi;B. Karney;Zhengwei Wang;Ze Yao
中科院分区：
文献类型：
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作者：
Zhongjie Li;H. Bi;B. Karney;Zhengwei Wang;Ze Yao
摘要 采用商业软件STAR-CCM+进行三维数值模拟，研究原型水泵水轮机正常停机过程中的水力瞬态和流动行为。分析了水泵水轮机经过涡轮模式、进入涡轮制动模式、最后进入反泵模式时的全局特性和压力脉动。当导流叶片关闭时，流量和转轮扭矩均下降，同时转速因转轮上的负扭矩而下降。所提出的方法可以准确预测停机过程中的瞬态特性，并深入了解水泵水轮机的内部流动行为。因此，这项研究有可能促进涡轮机瞬态运行期间故障的探索和诊断。
Abstract Three-dimensional numerical simulations are carried out by commercial software STAR-CCM+ to investigate the hydraulic transient and flow behaviours of a prototype pump-turbine during the normal shutdown process. The global characteristics and pressure fluctuations are analysed as the pump-turbine runs through the turbine mode, into the turbine braking mode, and finally into the reversed pump mode. As the guide vanes close, flow rate and runner torque both decrease while the rotational speed drops in response to the negative torque on the runner. The proposed approach accurately predicts the transient characteristics during the shutdown process and provides insight into the inner flow behaviour of a pump-turbine. Thus, this study has the potential to facilitate both exploration and diagnostics of faults of turbo machines during transient operation.