在水轮机运行过程中,由于气隙空蚀的产生,导致水轮机通流部件受到严重损坏,对水轮发电机组的安全满发造成很大的威胁。因此,研究水力机械抗汽蚀的问题,引起国内外的极大关注。汽蚀是一种复杂的动水力学现象。至今未形成世所公认的完整的汽蚀理论。普遍认为,在高速流体中,当某处压力降低到液体的饱和蒸汽压力以下时,导致爆发性的汽化,生成汽——气空泡,当汽化空泡流动到高压区突然被压缩而在固体表面崩溃时,形成射流般的高频 During the operation of the turbine, due to the occurrence of air-gap cavitation, the throughflow components of the turbine are severely damaged, which poses a great threat to the safety of the turbine generator. Therefore, studying the anti-cavitation problem of hydraulic machinery has aroused great attention at home and abroad. Cavitation is a complex hydrodynamic phenomenon. To date, no intact cavitation theory has been established in the world. It is generally accepted that in a high-speed fluid, when a pressure drops below the saturated vapor pressure of the liquid, it causes explosive vaporization, generating vapor-air cavitation that is suddenly compressed when the vaporized cavitation flows to a high pressure zone, Surface collapse, the formation of jet-like high-frequency