摘要
针对传统的旋流竖井泄洪洞在高水头大流量运行过程中,存在发生壁面空化空蚀的风险,提出壁面全程掺气旋流竖井。通过试验,对竖井段掺气水流的流动特性进行了研究,对竖井壁面的压力、空腔长度,掺气浓度进行了测量。结果表明,采用这种新的掺气方式,竖井沿纵向全程产生了稳定的掺气空腔、掺气效果明显,整个竖井壁面均为含气浓度较高的掺气水流,减免了整个竖井壁面出现空化空蚀破坏,并且竖井壁面压力稳定,不会对竖井壁面的结构安全造成影响。
When the traditional vortex shaft discharge tunnel operates on the conditions of high head and large flow, there is a risk of cavitation occurred on the surface of tunnel. So a new type of shaft aerator in discharge tunnel with vortex drop is presented. The aerator is set at the shaft wall along the longitudinal direction. The hydraulic characteristics including time- average wall pressure, cavity length and air concentration of this new shaft aerator are measured and analyzed by model experiment. The results show that the stable cavities are generated along flow direction, the air entrainment effect is obvious, the high-concentration aerated water uniformly distributes near entire shaft wall, and the time-average pressure on shaft wall is stable without adverse impact on tunnel structure.
出处
《水力发电》
北大核心
2016年第7期115-119,共5页
Water Power
基金
国家自然科学基金资助项目(51179113)
