The Study of Solution to Relieve the Backwater of Aerator Structure of Spillway Tunnel

The main problem of high velocity flow in spillway tunnel that always need to pay attention to, is cavitation of flow pass surface that caused by flow cavitation,and aeration is one of the efficient measure to solve the cavitation of flow surface in spillway tunnel.In this paper,taked the aeration structure of one hydropower station spillway open flow chute as example to discovery and camparison from different angle.The result showed that aerator and flat section connected by arched bottom could solve the program of counterclockwise vertice and cacum backflow problem at aerator downstream.The study result could supply techninology support for engineering design and running in the future, and has very important meansing for reform the design of spillway tunnel and raised the reliability of safety running of spillway tunnel,meanwhile could impulse the development of science and technology in this field in our country.