【摘要】 总结以往圆形断面管道动能修正系数的研究,采用物理模型试验与数值模拟计算相结合的方法,借助于流体数值计算软件FLUENT和数学计算软件MATLAB对城门洞形有压隧洞断面动能修正系数进行研究。研究表明:城门洞断面恒定紊流会形成三对反向环流;当雷诺数大于等于4.0×103时,城门洞断面动能修正系数的取值可参考圆形断面动能修正系数的取值;城门洞断面动能修正系数随着雷诺数和水力半径的增大而减小,且普通城门洞断面动能修正系数小于非普通城门洞断面动能修正系数。更多还原

【Abstract】 Kinetic energy correction factor of gate arch-shaped sections of pressured tunnel has been studied by using FLUENT and MATLAB in combination with physical model tests. The results show three pairs of transverse circulation in the steady turbulence flow in such a tunnel. And when Reynolds number is no less than 4.0×103, this factor takes a value comparable to that for circular section. It decreases with an increasing Reynolds number and hydraulic radius and shows a difference between tunnels of standard and nonstandard gate arch shapes.更多还原