高水头附环闸门水力特性及闸门启闭力试验研究

Experimental Study on Hydraulic Characteristics of High Head Enclosed Gate and Its Opening and Closing Force

结合某水电站泄洪中孔在140 m水头条件下的附环闸门,采用模型试验的方法对其相关水力特性,包括流速达40 m/s量级的门槽区水流空化特性、附环闸门启闭过程中的门槽区水力变化特性、门后通气设施的掺气效果、闸门启闭力等进行研究。实验中测量了门槽段的时均压力分布、脉动压力与能谱以及附环事故闸门后通气管风速等。结果表明:附环闸门不会造成水流空化现象,且错台高度控制在0.02 m设计范围内其安全性能有保障;在闸门闭门过程中,闸门连接杆先承受拉力后承受压力,可据此选择相应的闸门启闭力容量。

Model test method was used in this research to analyze the hydropower station mid discharge orifice 140 m water head in the attached ring gate in the hydraulic characteristics which include the velocity of 40 m/s,the magnitude of the door groove cavitation characteristics,attached to the ring gate opening and closing of gate slot area variation characteristics of hydraulic,door ventilation facilities in the effect of aeration,gate closing force etc. In the experiment,the gate slot time average pressure distribution,pressure fluctuation and energy spectrum and attached ring gate of the accident ventilation tube wind speed were measured. The results show that the ring gate will not cause cavitation phenomenon,and altitude control in the design range of 0. 02 m of its safety performance is guaranteed. In the gate closing process,the gate connecting rod to bear tension after the pressure which is valuable when select the corresponding gate capacity.