摘要
采用模型实验与数值模拟结合的方法对闸孔出流、绕流工况闸门压力分布、脉动特性、流场特性进行了分析。闸门压力分布曲线呈"M"型,迎水面水压力大于背水面水压力,且与上游水深正相关,闸门迎水面90°及背水面225°为压力极大值点。157°~202°、225°~360°为负压区,闸底180°及背水面270°为压力极小值点,闸底180°负压较大。压力脉动主频49.8 Hz为轴流泵转轮叶片频率,次主频0.3 Hz由闸底紊动强度较大的涡旋及负压产生,沿闸体迎水面向上游传递,脉动压力能量分布频域逐渐变窄、振幅逐渐减小、紊动强度逐渐降低。
The model experiment and numerical simulation are used to analyze the orifice outflow,the pressure distribution,the pulsation characteristics and the flow field characteristics of the gate outlet,the flow around the flow condition,and the flow characteristics. The gate pressure distribution curve is ＂M＂,and the water pressure on the surface is larger than the water pressure on the back surface,and is positively related to the upstream water depth. The gate facing the water surface is 90 degrees and the back water surface is 225 ° as the maximum pressure point. The 157° ~ 202°and 225° ~ 360°are negative pressure,the bottom 180 °and the back surface 270° are the minimum pressure points,and the negative pressure at the bottom of the gate is 180°. The pressure pulsation frequency 49.8 Hz axial flow pump blade frequency,time frequency of 0.3 Hz by the gate bottom turbulent vortex and pressure intensity of the larger,the gate body along the upstream transmission,fluctuating pressure energy distribution frequency and amplitude decrease gradually and turbulence intensity decreases little by little.
作者
李利荣
LI Li-rong(Inner Mongolia Water Resources and Hydropower Survey and Design Institute,Hohhot 010020,Inner Mongolia,China)
出处
《中国农村水利水电》
北大核心
2018年第8期160-165,175,共7页
China Rural Water and Hydropower
基金
内蒙古自然基金"泄水建筑物事故闸门动水关闭水动力特性研究"(2014BS0110)
关键词
滚筒闸门
模型试验
数值模拟
脉动压力
roller gate
model experiment
numerical simulation
pulsation pressure
