基于原型观测的高水头泄洪洞通气特性研究

掺气减蚀是降低高速水流对泄水建筑物造成空蚀破坏的一项重要措施。以锦屏一级水电站原型观测试验为基础,分析了原型观测数据结果,研究了泄洪洞整体通气系统的通气特性以及泄洪洞通气量与泄洪水流间的关系。研究表明,泄洪洞及掺气竖井进气量随闸门开度增大而增大,补气洞进气量随流量增大而增大,但泄洪洞的洞顶余幅会限制进气量随流量的线性变化,洞顶余幅越小,进气量相应减小。

Research on ventilation features of high water head spillway tunnel based on in-situ observation

Aeration is a effective measure to prevent flood discharge structure from cavitation destruction by high-speed flow. According to the in-situ measured data of Jinping I Hydropower Station, we analyze the measured data, study the ventilation features of the spillway tunnel, and obtain the relation between the ventilation volume of spillway tunnel and flood flow. The re-sults show that the aeration through spillway tunnel and ventilation shaft increases with sluice gate opening degree, and the aera-tion of air admission hole rises with the flood discharge. However, the linear relation between aeration volume and flood discharge would be restricted by the clearance of the tunnel in that the smaller the tunnel clearance is, the less the aeration volume is.