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水轮机转轮叶片表面粗造情况决定了水流对转轮通流而的摩擦损失。转轮流道表面光洁度在生产制造中没有达到应有的要求,对水轮机的能量指标及汽蚀破坏具有不利影响,水轮机转轮通流面的光洁究竟达到几级才能是“水力光洁”?怎样来计算转轮叶片出口边的最大流速,从而可求得转轮通流而的允许(临界)粗糙度,这就是本文叙述的目的。允许粗糙度的估算日本东芝公司福田博充利用圆板和混流式转轮表面不同的粗糙度作了试验。得到以下结
The rough surface of the turbine runner blades determines the friction loss of the water flow to the runner. Runner runner surface finish did not meet the requirements in the manufacturing, the energy index of the turbine and cavitation damage have an adverse effect on turbine runner smooth surface after reaching what level can be “hydraulic smooth”? How to Calculating the maximum flow velocity at the exit side of the rotor blades allows the (critical) roughness of the runner to be obtained, which is the purpose of this paper. Roughness estimation allowed Japan’s Fukuda Hakata, Toshiba, using disc and Francis runner surface roughness was tested. Get the following knot