中文摘要：

结合公伯峡水平旋流泄洪洞1∶40和1∶60模型及原型试验成果,分析了通气系统的通风机理,依据相似理论研究了通风量的相似性问题。研究表明,水流挟气使空腔内形成负压,通风由通气孔进出口的压差产生;空腔内真空度是原、模型通风量相似的主要影响因素;受通气孔摩阻特性和空腔内气体状态的影响,真空度比尺与几何比尺并不相等,导致通风量比尺与重力相似比尺不符;但对于1∶40模型,旋流洞环流速度最大值为6.2m/s,真空度比尺与几何比尺较为接近,起旋室通风井通风量可近似按重力相似引申。

英文摘要：

This paper analyzes the ventilating mechanism and ventilation similarity of a horizontal gyrating flow system by combing similarity theory and experimental results of Gongboxia discharge tunnel prototype and its models of scales 1 ： 40 and 1 ： 60. This analysis shows that the ventilation is caused by a difference between the inlet pressure of the air vent and its outlet negative pressure and the latter is engendered by flow aeration in the bottom cavity. The vacuum degree of this cavity is the major factor controlling prototype-model ventilation similarity. The scale of vacuum degree, subjected to the skin friction of the air vent walls and the air state in the cavity, could be different from the geometrical scale, so it could cause the ventilation scale to deviate from the law of gravity simihitude. In the case of gyrating discharge tunnel model of scale 1 ： 40, however, its maximum flow velocity reaches 6.2m/s and the cavity scale. In that case, ventilation in the ventilating shaft of gravity simihitude. vacuum degree scale is nearly equal to its geometrical of starting rotation device approximately follows the law