| 肖若富,陶然,刘伟超.水泵水轮机泵工况驼峰特性形成机理瞬态数值研究[J].计算力学学报,2014,31(6):769~774 |
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| 水泵水轮机泵工况驼峰特性形成机理瞬态数值研究 |
| Numerical study on unstable head-discharge performance in pump-turbine considering the transient rotor-stator interactions |
| 投稿时间：2013-08-27 修订日期：2013-11-25 |
| DOI：10.7511/jslx201406014 |
| 中文关键词: 水泵水轮机 CFD模拟 驼峰特性 动静交接面 |
| 英文关键词:pump-turbine CFD simulation unstable head-discharge rotor-stator interaction |
| 基金项目:国家自然科学基金(51139007);大北农青年学者研究计划(2413001)资助项目. |
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| 中文摘要: |
| 针对水泵水轮机泵工况流量-扬程曲线的驼峰特性,采用SST k-ω湍流模型对水泵水轮机进行模拟,并研究定常与非定常模拟对流量-扬程特性的预测准确性。建立活动导叶开度为20°的水泵水轮机全流道模型,对于非定常模拟,在尾水管(吸水室)-转轮与转轮-活动导叶两动静交接面处,分别设置考虑瞬态效应的TRS(Transient Rotor Stator )模型,模拟预测机组流量-扬程关系,分析各过流部件扬程损失并研究驼峰区产生机理。模拟结果表明,泵工况下水泵水轮机流量-扬程驼峰特性与固定部件内部涡结构及其所致损失紧密相关。相比定常模拟,瞬态非定常模拟结果与试验值更为吻合,且在交接面前后相邻处速度场变化平缓,符合实际流动规律。考虑交接面瞬态作用的非定常模拟能够更加准确地模拟水泵水轮机等叶轮机械在非设计工况下的流动,为改善水泵水轮机运行稳定性提供有效的参考。 |
| 英文摘要: |
| The unstable head-discharge characteristic affects the stability and security of pump-turbine.In pump mode,the unstable phenomenon may occur when the pump-turbine is starting,shutting down or running at the maximum head condition.To investigate this phenomenon,numerical simulation with SST k-ω turbulence model was conducted.Both steady and transient analysis type were used to forecast the head-discharge characteristic.The whole flow passage was modeled with the adjustable vane opening angle of 20 degrees.The Transient Rotor Stator (TRS) model which considering the transient interaction was set respectively at the "draft tube-runner" and "runner-adjustable vane" interfaces.In this study,head-discharge curves were plotted and the head losses in the flow passages were calculated to reveal the mechanism of the unstable head variation.Results show that the unstable head-discharge performance is related to the vortex structure and accompanying loss.Compared with steady analysis,the result of transient analysis is more coincident with experimental data and has a more realistic flow field variation in front and behind the rotor-stator interfaces.The transient analysis with considering rotor-stator interactions is more suitable for pump-turbine and other turbo-machinery especially under off-design conditions.So,this study will provide more valid guidance to improve the operating stability of pump-turbines. |
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