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为了提高水轮机的比转速,需要增大转轮叶片上的绕流速度,这样便加剧了汽蚀破坏的程度。降低汽蚀破坏的途径是合理地设计叶型,增大机组的开挖深度及选用耐汽蚀的材料,而这种材料,从经济和技术观点看,用在水轮机制造中是允许的。为了避免汽蚀破坏,在技术设计时,除有汽蚀特性外,还必须对水轮机转轮的汽蚀破坏区及破坏程度有一个概念。列宁格勒工学院水力机械试验室对模型混流式水轮机的汽蚀破坏进行了一些研究,其结果及
In order to increase the specific speed of the turbine, it is necessary to increase the flow velocity around the rotor blades, thus exacerbating the degree of cavitation damage. The way to reduce the cavitation damage is to design the blade type reasonably, to increase the excavation depth of the unit and to choose the material resistant to cavitation, which material is allowed to be used in the manufacture of hydraulic turbines from an economic and technical point of view. In order to avoid cavitation damage, in the technical design, in addition to the cavitation characteristics, it is also necessary to have a concept on the cavitation damage area and the degree of damage of the turbine runner. Leningrad Institute of Hydraulic Machinery laboratory model Francis turbine cavitation damage carried out a number of studies, the results and