三岔管内水流流动的数值模拟与实验研究

结合江苏宜兴抽水蓄能电站工程建设中钢岔管的设计要求，对分岔角为64°的三岔管内水流的流动进行数值模拟与实验研究。计算中选择SIMPLE方法求解三维雷诺平均方程和k-ε两方程湍流模型，实验采用数字图像测速(DPIV)系统和在试验段前后断面上安装液体差压计对三岔管中心的水平面内的压强差进行测量。研究结果表明，无论水头损失还是三岔管内水流的流动模式，计算与实验吻合得较好，同时反向双管流动较正向双管流动的能量损失大，在相同的流速情况下，单管流动比双管流动的能量损失大，正向单管比反向单管的能量损失大。

Numerical simulation and experimental study on water flow in Y-type tube

A series of experiments and numerical simulation of water flow in the Y-type tube with circular cross section have been carried on to meet the request of the design for fork tube in the Yixing Hydropower Plant. The SIMPLE method is applied in the calculations of Reynolds averaged flow equation and к-εturbulence equation. By using DPIV system and pressure difference gauge, the detail measurement of water flow in the horizontal plane of fork tube is made. It is shown that the calculation result is in good agreement with the experimental data including the water head loss and flow pattern. It is also concluded that the flow losses of reverse flow in branches are larger than that of direct flow. Under the condition of the same velocity, the flow energy losse in single tube is larger than that in double tube. Energy losses of direct flow in single tube are larger than that of reverse flow.