| 李琪飞,蒋雷,李仁年,权辉.水泵水轮机反水泵工况区压力脉动特性分析[J].水利学报,2015,46(3): |
| 水泵水轮机反水泵工况区压力脉动特性分析 |
| Study of pump-turbine’s pressure fluctuations at reverse pump mode |
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| DOI： |
| 中文关键词: 水泵水轮机 反水泵区 压力脉动 数值模拟 |
| 英文关键词: pump-turbine reverse pump mode pressure fluctuation numerical simulation |
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| 中文摘要: |
| 为研究水泵水轮机反水泵区的压力脉动特性， 以某抽水蓄能电站模型水泵水轮机为研究对象， 基于分离涡湍流方法（detached eddy simulation，DES），对水泵水轮机反水泵工况进行了数值模拟。探讨了全流道三维湍流场特性， 并与试验结果相对比， 分析了水泵水轮机在反水泵工况区压力脉动特性。结果表明， 反水泵工况下， 转轮与导叶之间和尾水管内的主频均为0.143 倍转频， 主频幅值占混频幅值比例分别达到12 %和34.6 %。通过流场分析，发现尾水管锥管段内的螺旋形涡带结构是导致这种低频脉动的主要原因。同常规运行工况相比， 反水泵工况区的不稳定流场会导致压力脉动相对幅值的突增， 引起机组剧烈的振动， 严重影响机组的安全运行。 |
| 英文摘要: |
| To study the pressure fluctuation characteristics of the pump-turbine at reverse pump mode，the numerical simulation which used the detached eddy simulation（DES） was carried out at reverse pump mode，based on the model pump-turbine in a pumped storage power station in China. The turbulence characteristics of the full three-dimensional flow field was investigated and compared with the experimental results. The pressure fluctuation characteristics of the model pump-turbine at reverse pump mode was analyzed. The results showed that， under reverse pump conditions， the dominating frequency between the guide vanes and runner is 0.143fn（fn is the rotation frequency of runner） as well as the draft，and the amplitude of dominating frequency reached 12 % and 34.6 % respectively， accounted for the mixing frequency. The flow field analysis suggested that the spiral vortex structure in the draft tube was the main reason which causes this low frequency pressure fluctuation. Compared with the common operating conditions， the unsteady flow at reverse pump mode resulted in the sudden increase of the relative amplitude of pressure.As a results，it led to the unit vibration and affected the safe operation seriously. |
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