一、前言水流挟沙不仅引起河道淤积,而且也给水力机械的正常工作带来很多不易解决的问题。除了因泥沙磨损引起过流部件很快损坏外,还将诱发汽蚀、降低其工作性能、严重的则淤塞水工建筑物使水轮机、水泵等不能工作。尽管如此,对这方面的研究工作却开展的很不够,尤其是清水泵的挟沙试验,在国内几乎没有进行过,有关这方面的研究还大多处于理论探讨状态。为了解工程中挟沙水流对泵站流道的淤积和水泵的运行情况笔 I. Introduction Sediment-laden flow not only causes river siltation, but also brings many problems that are not easy to solve for the normal operation of hydraulic machinery. In addition to the rapid damage caused by sediment erosion caused by excessive flow components, it will also induce cavitation, reducing its performance, the serious blockage of hydraulic structures so that water turbines, pumps and so can not work. In spite of this, research work in this area has not been carried out sufficiently. In particular, the sediment-carrying test of fresh water pumps has hardly been carried out in China. Most of the researches in this field are in the state of theoretical exploration. In order to understand the project of sediment-laden flow of pumping station runway deposition and pump operation Pen