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依据公伯峡水平旋流泄洪洞原型观测和反演模型试验的成果,对这种新型水平旋流内消能泄洪洞在闸门启闭过程中的脉动压力特性进行了对比与分析。研究表明环形掺气坎上游竖井段、起旋室内及水平旋流洞内压力随时间变化趋势原型和模型的基本一致,符合重力相似准则;受缩尺效应的影响,原型和模型环形掺气坎的空腔长度不同,压力差异较大;起旋室内的压力变化可分为四个阶段;原、模型相应测点的水流的优势频率均属低频,远小于建筑物的固有频率。
Based on the results of prototype observation and inversion model test of the horizontal spiral flow discharge tunnel at Gongboxia, the characteristics of the pulsating pressure during the opening and closing of the sluice gate were compared and analyzed. The results show that the trend of the pressure in the upstream shaft section, the spiral chamber and the horizontal swirl cavity in the annular aeration tank is basically consistent with that of the model, which accords with the gravity similarity criterion. The prototype and the model annular aeration tank There are four different stages of pressure variation in the whirling chamber. The dominant frequencies of the water flow at the corresponding measuring points of the original model and the model are all low frequencies, far less than the natural frequency of the building.