高速明流泄洪洞的通气量分析与研究

Analysis and Research of Aeration Capacity of the Spillway Tunnel with High Speed Flows

对于高速明流泄洪洞的进气量和出口的出气量,通过模型试验,从宏观方面进行了数据分析与研究。研究结果表明:泄洪洞中闸室的进气量并不是随着泄洪洞水体流量的增加而增加,而是与闸门后水流的Fr相关;泄洪洞内由水流的自掺气引起的进气量随着水流的Fr增大而增大;在泄洪洞的出口,当库区水位一定时,随着中闸室闸门的开度的增加,出气量随水流的Fr的增大不断增加,然而当达到某一临界值后开始急剧减小;当闸门全部开启后,随着库区水位的上升,出气量随水流的Fr的增大不断减小;出口断面处水体的掺气浓度随水流Fr的增大而增大。

The aeration capacity of the spillway tunnel with high speed flows was analyzed by model experiment from the macroscopic aspect.The results showed that the aeration capacity of the complement wind tunnel in the mid-gate chamber would not increase as the rate of flow increasing.The aeration capacity is related to the Froude number of the flow out of the gate.The aeration capacity which arises from the self-aerated flow increases as the Froude number increasing.When the water level of reservoir is constant,the air output of the tunnel increases to a critical value then decreases sharply along with the increase of the Froude number.When the radical gate is fully opened,the air output of the tunnel decreases as the Froude number increasing.The air concentration of the outflow increases with the increase of the Froude number.