水泵水轮机泵工况流动结构演变对驼峰特性的影响

发布时间：2018-04-04 03:37

本文选题：水泵水轮机　切入点：旋转失速　出处：《浙江大学学报(工学版)》2017年11期

【摘要】：为了揭示水泵水轮机在泵工况流动结构演变对特性曲线驼峰特性的影响,采用SAS湍流模型对多个工况点的流态进行全流道数值模拟,得到两者之间的关联性.结果表明,当水轮机在40%~80%最优流量运行时,导叶内发生旋转失速;当流量低于40%最优流量时,转轮进口产生的回流涡结构在尾水管边壁侧产生螺旋回流阻碍过流,并改变转轮叶道在空间上的过流能力,进而改变转轮出流特性;转轮出口下环侧流速降低,使导叶所有叶道均产生剧烈流动分离,导致旋转失速消失,并产生回流流入转轮.转轮进口回流涡结构的出现,改变了水轮机内的流动分离特性,使水头损失突然增大,产生驼峰特性.
[Abstract]:In order to reveal the influence of flow structure evolution of pump turbine on the hump characteristic of characteristic curve, the SAS turbulence model was used to simulate the flow pattern of multiple working conditions, and the correlation between them was obtained.The results show that the rotating stall occurs in the guide vane when the turbine is running at the optimal flow rate of 40% or 80%, and when the flow rate is below 40%, the return vortex structure at the inlet of the runner produces spiral backflow on the side of the side of the draft tube to hinder the overflow.It also changes the flow passing capacity of the runner blade in space, and then changes the flow characteristics of the runner outlet, and the velocity of the lower ring side of the runner outlet decreases, which results in the violent flow separation of all the impellers, resulting in the disappearance of the rotating stall and the return flow into the runner.The appearance of circumfluence vortex structure at the inlet of runner changes the flow separation characteristics in the turbine and causes the head loss to increase suddenly and the hump characteristic is produced.
【作者单位】：重庆交通大学西南水运工程科学研究所;武汉大学水资源与水电科学国家重点实验室;中国舰船设计研究中心;
【基金】：国家自然科学基金资助项目(51579187) 重庆市科委自然科学基金资助项目(cstc2016jcyjA1935) 重庆市教委基金资助项目(KJ1600514) 重庆交通大学内河航道整治技术交通行业重点实验室开放基金资助项目(NHHD-201505)
【分类号】：TV734

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