摘要
水泵水轮机在不同空载开度的飞逸状态运行时,往往会造成巨大的压力脉动,导致机组运行不稳定。为探究不同导叶开度的水泵水轮机在飞逸工况下流场特征与压力脉动的关系,以某电站的模型机为例,通过数值模拟方法开展了飞逸工况下转轮内部流动的数值分析。结果表明,压力脉动方面,与小开度工况(6 mm)相比,大开度工况(31 mm)转轮内的压力脉动幅值更为剧烈,无叶区压力脉动幅值最大,且具有0.65 f_(n)的脉动频率与其他低频脉动。流场方面,与小开度工况(6 mm)相比,大开度工况(31 mm)转轮内流场更为混乱。且受导叶开度的影响,转轮流道产生堵塞现象。可见当导叶开度越大,流动越不稳定,造成压力脉动随之增大。
When the pump-turbine operates in runaway conditions under different guide vanes openings(GVOs), it often causes huge pressure fluctuations, which leads to unstable operation of the unit. In order to understand the relationship between the flow field characteristics and the pressure fluctuations of pump-turbine with different GVOs under runaway conditions, a model of a pumped storage power station was selected as the research object and used numerical simulation methods for modeling and analysis. The results show that the pressure fluctuation with large GVOs(31 mm) is more severe than that with small GVOs(6 mm). Especially in the vaneless area, the amplitude is the largest, and there is a fluctuation frequency of 0.65fand other low-frequency fluctuation. For the flow characteristics, large-GVOs operation is more chaotic than small-GVOs operation. Because of the influence of the GVOs, and the runner flow channel is blocked. From the above summary, when the GVOs is larger, the flow is more unstable and the pressure pulsation increases.
作者
江振瑜
祝宝山
JIANG Zhen-yu;ZHU Bao-shan(State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing100084,China;Department of Energy and Power Engineering,Tsinghua University,Beijing100084,China)
出处
《水电能源科学》
北大核心
2022年第11期181-184,72,共5页
Water Resources and Power
基金
水沙科学与水利水电工程国家重点实验室基金(2021-KY-04)。
关键词
水泵水轮机转轮
飞逸工况
压力脉动
内部流动
runner of pump-turbine
runaway condition
pressure fluctuation
internal flow
