基于CFD的含小拍门的闸门过流能力分析

Analysis of Flow Capability of Gate with Small Flap Valve Base on CFD

针对含悬挂式小拍门的闸门在运行过程中出现撞击力过大、振动严重等问题,对其流动状况进行了数值模拟计算,对比分析了不同拍门方案下的水力损失系数分布和内部流线。结果表明,拍门开启角度一定流量不同时其水力损失系数保持一致,侧翻式拍门和悬挂式拍门在不同角度下的水力损失系数大体相同;在相同过流面积下,悬挂式拍门在开启角度小于35°的状态下水力损失系数小于侧翻式拍门,而在开启角度大于35°的状态下大于侧翻式拍门;侧翻式拍门结构可减小水力损失,增强闸门启闭过程的稳定性。

Aiming at the problems of excessive impact force and serious vibration during the operation of the gate with suspended small flap valve,the distribution of hydraulic loss coefficient and internal streamline under different schemes were compared and analyzed.The results show that the hydraulic loss coefficients are approximately the same when the flap door is opened at a certain angle under different flow rate,and the hydraulic loss coefficients of the tilted and suspended flap doors are almost the same at different angles.Under the same overflow area,the hydraulic loss coefficient of the suspended flap valve is smaller than that of the rollover flap valve when the opening angle is less than 35 degrees,but larger than that of the rollover flap valve when the opening angle is greater than 35 degrees.The rollover flap valve structure can reduce hydraulic loss and enhance the stability of gate opening and closing process.