某水库底孔减压模型试验研究

Subatmospheric hydraulic model test for a bottom outlet

讨论了形成初生空化数比尺效应的水动力原因及热动力原因,从Rayleigh-plesset泡动力方程出发建议了初生空化数比尺效应的修正方法,用减压模型测定了某水库底孔事故平板门槽及泄槽突扩跌坎后的模型初生空化数KiM及给出了经空化比尺效应修正后的原型初生空化数Kip。

This paper discussed the hydrodynamic and the thermodynamic effects on the incipient cavitation. A method to revise the incipient cavitation number measured from the subatmospheric hydraulic model was suggested to consider scale effects. The cavitation characteristics for the emergency gate slot and the sluiceway downstream section with the drop and abrupt enlargement of a bottom outlet were tested. And the incipient cavitation numbers of hydraulic model were obtained and it of the corresponding prototype would be predicted.