一种新型掺气型旋流竖井的试验研究

Experimental study on hydraulic characteristic of the flow in a novel vortex shaft with aeration

传统旋流竖井泄洪洞在高水头大流量情况运行时,竖井内出现壁面掺气不足,将可能发生空化空蚀破坏影响泄洪建筑物的安全运行。本文提出了一种新型掺气型旋流竖井体型——双涡室掺气型旋流竖井。试验表明:该体型竖井内水流流态更加稳定,掺气更明显,空蚀特性得到明显改善,并增加了消能效果,而且结构更稳定,保证了旋流竖井泄洪洞的泄洪安全。

Traditional vortex shaft applied in condition of high head and large discharge,the wall of which can be damaged by resulting in cavitations due to a lack of aeration.In this paper,a novel type of vortex shaft,named as double volute chamber vortex shaft with aeration,was presented.Results showed that there are more stable flow pattern and more obvious aeration phenomenon in new designed geometry.Therefore,cavitations characteristics are improved significantly,and these increase the energy dissipation.Security of the flood discharge structure was ensured due to the stable flow pattern and favorable hydraulic characteristics of the flow in the vortex shaft.