分叉角与回转半径对双向流道灌水器水力性能影响模拟研究

为研究双向流道灌水器水力性能，将其结构单元作为研究对象，以分叉角和回转半径两个结构参数为影响因素，采用正交试验设计16种结构参数组合方案，利用计算流体动力学软件Ansysfluent对流道内部流体的流动状态进行数值模拟，通过量纲分析建立流道结构参数与流道单元局部水头损失的回归模型。结果表明：双向流道单元局部水头损失与分叉角、回转半径和流道流速有关，分叉角与局部水头损失呈负相关关系，回转半径和速度与局部水头损失呈正相关关系；当入口流速为固定值时，分叉角为32.4°、回转半径为1.72 mm，流道单元局部水头损失最大；当设置10个流道单元时，交叉排列方式组合的灌水器流态指数较优。

Simulation study on influence of fork angle and turning radius on hydraulic performance of bidirectional channel emitter

In order to study the hydraulic performance of bidirectional channel emitter, its structural unit was taken as the research object, with two structural parameters, fork angle and turning radius were used as the influencing factors. The orthogonal experimental design method was used to design 16 kinds of structural parameter combination schemes. The flow state of the fluid inside the flow channel was simulated by the computational fluid dynamics software Ansysfluent, and the regression model of the flow channel structure parameters and the local head loss of the flow channel unit was established by dimensional analysis. The results showed that the local head loss was related to the fork angle, turning radius and flow velocity, the fork angle was negatively correlated with the local head loss, and the turning radius and flow velocity were positively correlated with local head loss. When the inlet flow velocity was fixed, the fork angle was 32.4° and the turning radius was 1.72 mm, the local loss of the runner unit was the largest. When 10 channel units were set, the flow index of the emitter with cross arrangement was better.