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为分析三汊河闸下游的水动力特性及泄流时脉动压力对闸体振动的影响,采用数值模拟的方法,利用FLUENT流场模拟软件,对河口闸泄流过程进行立面二维模拟计算,分析了闸下游的流场、流态和沿床面的流速分布。并针对泄流时闸门振动问题,对作用在闸门上的压力特性进行脉动压力的频谱分析及脉动强度分析,得出脉动压力的能量分布和脉动强度在闸门上的分布规律。结果表明,下泄水流所产生的强紊动是造成闸门上压力脉动的主要原因,闸门上脉动压力的高能频率段为0~0.05 Hz,2.2 m以下的脉动压力对闸门起主要作用,闸门的自振频率大于0.05 Hz时可有效避免闸门的振动破坏。
In order to analyze the hydrodynamic characteristics of the downstream of Sanbahe River and the influence of pulsating pressure on the vibration of the sluice during the discharge, a numerical simulation method was used to simulate the discharge process of estuary sluice with two-dimensional simulation using FLUENT flow field simulation software The flow field, flow regime and velocity distribution along the bed surface were analyzed. In the light of the gate vibration problem during the discharge, the pressure characteristics of the gate were analyzed by frequency spectrum and the pulsating strength. The energy distribution and the distribution of the pulsating intensity on the gate were obtained. The results show that the strong turbulence caused by the discharge water flow is the main reason for the pressure pulsation on the gate. The high-frequency frequency range of the pulsating pressure on the gate is 0 ~ 0.05 Hz. The pulsating pressure below 2.2 m plays a major role in the gate. Vibration frequency greater than 0.05 Hz can effectively prevent the gate vibration damage.