贵港二线船闸泄水阀门体型研究

Body type of emptying valve at Guigang second-line ship lock

贵港船闸是西江航运干线的咽喉,航运地位十分重要。通过建立比尺为1∶15的泄水阀门非恒定流常压模型,对6种动水关门事故工况条件下贵港船闸泄水阀门3种体型的动水启闭力特性进行了系列研究,获得阀门底缘形式、阀门下游侧面板是否封闭对动水启闭力的影响规律:阀门下游侧面板不封闭将使下游河道水位的波动直接传播到阀门门井中,导致阀门启闭力反复波动;当阀门底缘朝下时,底缘斜面压力小,底缘受力主要表现为下吸力,因此对应开门过程启门力大、闭门过程闭门力小;阀门底缘朝上,底缘斜面压力大,底缘受力主要表现为上托力,因此对应开门过程启门力小、闭门过程闭门力大,采用底缘朝上型阀门时,应考虑阀门配重。

Guigang ship lock for navigation of Xijiang river is very important, which locates in key the main navigation lines.A scaled model of emptying valve was established at Guigang second-line ship position of lock with length scale 1：15. The net opening and closing forces is systematically studied for three structural valves in six emergency valve closing situations.The influent of shapes of root edge of valve and face plate of valve on net opening and closing forces is obtained： 1）The fluctuation of water level in downstream river will induce fluctuation of net lifting forces of valve because the water can flow into and out the well of valve freely when downstream face plate of valve was opened. 2） The pressure of tilted panel of root edge is low and the suction force plays a main role at the root edge of valve when the tilted panel of root edge faces downstream.As a result, the net opening forces of valve with tilted panel of root edge facing downstream are bigger and net closing forces are smaller than those of valve with tilted panel of root edge facing upstream. 3） The pressure of tilted panel of root edge is high and the lifting force plays a main role at the root edge of valve when the tilted panel of root edge faces upstream.Consequently, the net opening forces of valve with tilted panel of root edge facing upstream are lower and net closing forces are higher than those of valve with tilted panel of root edge facing downstream.An extra weight for valve should be considered when a valve with tilted panel of root edge facing upstream was applied.