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本文通过大量实验,对窄缝消能工的时均动水压力及脉动压力特性进行了初步研究.认为:窄缝消能工的底板和边墙所承受的动水压力比常规挑坎情况大得多,窄缝消能工的动水压强沿程分布规律符合本文表达形式(2)的;高速水流对窄缝消能工边墙冲击的脉动特性属于低频脉动,边墙上的脉动荷载占相应的动水荷载的比值较小,脉动能量主要集中在极低的频率范围内,因此动水压力脉动引起窄缝消能工边墙振动的可能性较小;窄缝消能工边墙的水流脉动压力振幅概率分布符合正态性.
In this paper, a large number of experiments were carried out to study the time-averaged hydrodynamic pressure and fluctuating pressure characteristics of narrow-gap dissipater, and the results show that the hydrodynamic pressure on the floor and side wall of the slotted energy dissipater is larger than that of the conventional bucket The distribution of hydrodynamic pressure along the narrow-gap dissipater is in accordance with the expression (2). The pulsating characteristics of high-speed water flow to the narrow-wall dissipator wall are of low frequency pulsation, and the pulsating load on the sidewall The corresponding dynamic water load ratio is small, the pulsating energy is mainly concentrated in the extremely low frequency range, so the hydrodynamic pressure pulsation caused narrow wall energy dissipater sidewall vibration is less likely; slit energy dissipater sidewall The probability distribution of fluctuating pressure amplitude of water flow accords with normality.