带转轮泵的顶盖取水装置流动特性研究  

Research on Fluid Dynamic Performances of Water Taking Device from Head Cover Including Rotary Pump

作　　者：张惟斌[1] 韩涛[2] 江启峰 唐健[1] 赵玺[1] 

机构地区：[1]西华大学流体及动力机械教育部重点实验室,四川成都610039 [2]映秀湾水力发电总厂,四川都江堰611800

出　　处：《水力发电》2016年第1期66-69,101,共5页Water Power

基　　金：国家自然科学基金资助项目(51379179);国家自然科学基金资助项目(51279172);流体及动力机械教育部重点实验室开放基金项目(szjj2011-006)

摘　　要：为研究带转轮泵的顶盖取水装置取水装置的内部流动特性,以渔子溪电站水轮发电机组的顶盖取水装置为例,针对其额定运行工况,采用基于有限元的有限体积法,结合CFD软件平台,对取水装置内部的流场分布和主轴密封真空度进行了数值计算,并将部分计算结果与现场测量数据进行对比,验证了数值计算方法的可靠性。在此基础上,针对变转速和变流量工况,分析了该取水装置的主轴密封真空度,转轮泵的扬程、轴功率和效率等的变化规律。结果表明,如果要保证主轴密封内全域无水运行,对于渔子溪电站,水轮机转轮上止漏环密封出口处的压力要小于推荐值(约为0.55 MPa);计算同时发现,转轮泵扬程随转速变大而变大,而随流量变大而变小,其流动损失较大,水力效率较低。For studying the internal fluid dynamic performances of water taking device from head cover which includes rotary pump, the water taking device from head cover in Yingxiuwan Hydropower Station under rated operation condition is researched by using finite volume method based on finite element and CFD software. The internal flowing characteristics of water taking device and the vacuum of main shaft sealing are numerically calculated, and the results arc compared with field test data. The comparison validates the reliability of numerical simulation. The change laws of the vacuum of main shaft sealing and the head, shaft power and efficiency of rotary pump under variable speed and variable flow operation conditions are also caleulated. The results show that, for Yingxiuwan Hydropower Station, if the pressure in the outlet of turbine runner crown seal ring is less than O. 55 MPa, the main shaft sealing will keep operating in a whole no-water environment. Meanwhile, the head of rotary pump will increase with rotating speed increase and decrease as flow increase, and the efficiency of rotary pump is lower because of higher fluid resistance losses.

关 键 词：顶盖取水装置 转轮泵 内特性 外特性 

分 类 号：TM312[电气工程—电机]