关键词: 掺气, 通气特性, 原型观测, 泄洪洞

Abstract: 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 results show that the aeration through spillway tunnel and ventilation shaft increases with sluice gate opening degree, and the aeration 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.

Key words: aeration, ventilation feature, in-situ observation, spillway tunnel