摘要
为深入了解双节式拍门不同开启角度对出流的影响,以某泵站的双节式拍门为例,选取在实际工程中大量使用的4种开启角度方案,利用数值模拟方法对双节式拍门在不同流量下的门后水流流态进行了三维模拟计算,分析了水流流线、流速均匀度和涵管内水力损失三个指标对水流流态的影响。结果表明,出水涵管沿程阻力损失系数与开启角度呈负相关关系,拍门开启角度越大,出水涵管内水流的水力损失越少,且随流量的增大越来越明显,流量为2 m^(3)/s时方案4与方案1相比水力损失下降了49.6%,流量为16 m^(3)/s时方案4较方案1水力损失下降了79.1%;涵管内流态与开启角度呈正相关关系,拍门开启角度越大,涵洞内水流流态越好,当拍门的开启至方案3上拍门46°、下拍门64°后,涵洞内水流状态已趋于较优状态。
In order to deeply understand the impact of the alteration of different opening angles of the two stage flap valves on outflow,a two-stage flap valve of a certain pumping station was taken as an example.Choosing four opening angle schemes widely used in practical projects,the three-dimensional flow pattern behind the two stage flap valve under different flow rates was simulated.The influence of flow streamline,velocity uniformity and hydraulic loss in culvert on the flow pattern was analyzed.The results show that the resistance loss coefficient along the outlet culvert is inversely correlated with the opening angle,to be specific the larger the opening angle of the flap valve,the less the hydraulic loss of the water flow in the outlet culvert pipe,and disparity degree becomes more obvious with the increase of the flow rate.When the flow rate is 2 m^(3)/s,the hydraulic loss of the outlet culvert pipe in scheme 4 decreases by 49.6% compared to that of scheme 1;When the flow rate is 16 m^(3)/s,the hydraulic loss of the outlet culvert pipe in scheme 4 decreases by 79.1% compared to that of scheme 1.To conclude,the larger the opening angle of the flap valve,the better the flow pattern in the culvert and when the flap valve is opened to 46°for the upper flap valve and 64°for the lower flap valve in scheme 3,the flow pattern in the culvert has tended to a better state.
作者
付国丛
陈华
周秉南
刘健峰
夏辉
陆伟刚
FU Guo-cong;CHEN Hua;ZHOU Bing-nan;LIU Jian-feng;XIA Hui;LU Wei-gang(College of Hydraulic Science and Engineering,Yangzhou University,Yangzhou 225009,China;Jiangsu Surveying and Design Institute of Water Resources Co.,Ltd.,Yangzhou 225127,China)
出处
《水电能源科学》
北大核心
2023年第5期162-165,共4页
Water Resources and Power
基金
国家自然科学基金项目(51779215,52079120)。
关键词
双节拍门
门后水流
流态分析
数值模拟
泵站
two-stage flap valves
flow pattern on the rear side of the flap valves
flow pattern analysis
numerical simulation
pumping station
