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水电站地下主厂房的送风量很大，采用顶送风方式可避免大量占用有用空间。用相似模型试验研究了这一送风方式，分析了送风口数目、位置、尺寸及送风风速对工作区温度和风速的影响，定义了几个无因次参数；获得了无固次回归方程。这些方程可广泛用于工程实践。研究结果表明，顶送风的效果是满意的。建议水电站地下主厂房采用顶逆风方式。
The underground powerhouse of the hydropower station has a large amount of air supply. The use of the top air supply method can avoid occupying a lot of useful space. A similar model test was used to study the air supply mode. The influence of the number, location, size and air velocity of the air supply on the temperature and wind speed in the work area was analyzed. Several dimensionless parameters were defined. . These equations can be widely used in engineering practice. The results show that the effect of top blowing is satisfactory. It is suggested that the main underground powerhouse of hydropower station adopts the upwind mode.