含沙水流情况下水轮机的汽蚀系数及吸出高度

Cavitation Coefficient and Static Draft Head of Hydraulic Turbine in Silt-laden Water Flow

本文以含沙水流时的伯努利方程为依据,从理论上推导了含沙水流时水轮机的汽蚀系数与吸出高度计算公式;并与清水时相比较,建立了含沙水与清水条件下水轮机的汽蚀系数及吸出高度的关系式;阐述了在含沙水流时水轮机吸出高度的确定方法与汽蚀性能的评价原则。其结果对防止或减轻含沙水流时水轮机的汽蚀及泥沙磨损破坏有一定的理论指导意义和实际应用价值。

In this paper, from Bernoulli's equation of silt-laden water flow, the formulae of cavitation coefficient and static draft head of a hydraulic turbine in silt-laden water flow are ascertained theoretically. By comparing the formulae with that of clear water, the relationship of formulas in both situations is found. The determination of static draft head and evaluation principle of cavitation performance in silt-laden water flow are expounded.