单管系统水流运动的数值模拟与总流描述  

Numerical simulation of turbulent flow in single pipe system

作　　者：吴洪雨[1] 刘士和[1] WU Hongyu;LIU Shihe(School of Water Resources and Hydropower, Wuhan University, Wuhan 430072, Chin)

机构地区：[1]武汉大学水利水电学院

出　　处：《武汉大学学报（工学版）》2018年第6期487-490,527,共5页Engineering Journal of Wuhan University

摘　　要：针对湍管流,从粘性不可压缩流体运动的控制方程出发,得到了单管系统总流机械能损失和过流能力的关系式,实现了流场描述和总流描述的对接.采用雷诺应力模式封闭雷诺时均方程,通过针对性的网格布置对单管系统的水流运动进行了数值模拟,计算成果表明：1）当管道离底部壁面距离大于3倍管径后,进口段流场基本不受底部壁面条件影响,水流表现为完善收缩;2）当进口段的水流处于不完善收缩时,其总流机械能损失最大,过流能力最小;而当作用水头大于15倍管径后,作用水头对总流机械能损失和过流能力的影响很小.Aiming at the turbulent pipe flow,the following results are obtained through theoretical analysis and numerical calculation：1.A calculation formula of total flow mechanical loss and discharge capacity in single pipe system is derived from the governing equations for incompressible viscous flow;thus a combination between the flow field and the total flow description is established.2.The flow in single pipe system is numerically calculated during which the Reynolds averaged equations are closed by Reynolds stress model;and grid is distributed pointedly;the calculating results show that：1）When the distance between the pipe and the bottom wall is more than 3 times the pipe diameters,the flow field in the entrance region of the pipe is hardly affected by the bottom wall,with flow exhibiting as complete contraction.2）The maximum mechanical energy loss appears in circumstances of incomplete contraction,accompanied by the minimum discharge capacity;while when the water head is greater than 15 times pipe diameter,it has little influence on the mechanical energy loss of total flow and discharge capacity.

关 键 词：湍管流 数值模拟 总流描述 

分 类 号：TV131.2[水利工程—水力学及河流动力学]