西津二线船闸阀门段空化特性及抑制效果

Cavitation characteristics and suppression effect of valve section of Xijin Second Line Ship Lock

针对船闸阀门段空化问题,以新建的西津二线船闸为例开展原型观测研究,观测表明:充泄水阀门采用设计阶段阀门模型推荐的门楣体型,原型中实现了门楣自然通气,充泄水阀门双边开启最大通气量分别为0.11、0.17 m^(3)/s。门楣通气抑制阀门段空化效果显著,整个阀门开启阶段,闸顶未听见不通气存在的明显的空化泡溃灭声及雷鸣声;与不通气相比,门楣通气后充泄水阀门双边开启过程中空化噪声强度平均降低60%、82%;充泄水过程中,闸顶声级计在开阀期间所采集的平均噪声分别为68、79 dB;门楣通气后,阀门吊杆振动得到明显改善。防空化措施能够有效保护阀门及阀门段廊道免受空蚀侵害,保障船闸安全高效运行。

The prototype observation study is carried out for the valve section cavitation problem of the ship lock,taking the newly built Xijin Second Line Ship Lock as an example,the observation shows that the valve slit type recommended by the valve model at the design stage is adopted for the water filling and draining valve,and the natural ventilation of the valve slit is realized in the prototype,and the maximum ventilation volume for the bilateral opening of the water filling and draining valve is 0.11 and 0.17 m^(3) s respectively.The effect of valve slit ventilation to suppress the valve section cavitation is remarkable:throughout the during the valve opening stage,the obvious cavitation bubble collapse sound and thundering sound which existed without ventilation are not heard at the top of the gate.Compared with no ventilation,the cavitation noise intensity during the bilateral opening of the valve is reduced by 60%and 82%on average after the valve slit is ventilated.The average noise collected by the sound level meter at the top of the gate during the valve opening process wis 68 and 79 dB respectively.The vibration of the valve boom is significantly reduced after the valve slit is ventilated.The anti-cavitation measures can effectively protect the valve and the valve section corridor from cavitation and ensure the safe and efficient operation of the lock.