齿间角对迷宫灌水器水力特性影响的数值模拟

为了探究迷宫流道齿间角对灌水器水力性能的影响，应用CFD流场和速度场的数值分析方法，研究齿间角度分别为50°,60°,70°和80°时正齿型和斜齿型迷宫灌水器的流场和速度场随齿间角的变化规律.研究结果表明：相比于RNG k-ε模型和SST模型，标准k-ε模型的计算结果与试验结果更加接近；正齿型和斜齿型迷宫灌水器通道内主要存在2处低速回流区，即齿型的左上侧低速回流区和右下侧低速回流区；相比于正齿型迷宫灌水器，斜齿型迷宫灌水器左上侧的低速区域较多，而右下侧的低速区域较少；随着齿间角度不断增加，灌水器内的流量不断增大，斜齿型迷宫灌水器内的流量增加受齿间角度的影响更为明显；正齿型迷宫灌水器的流量系数较大，但流态指数较小，齿间角度为70°的正齿型迷宫灌水器的流态指数在所有灌水器中最小，其水力性能最好.

Numerical simulation of influence of tooth angle on hydraulic characteristics of labyrinth emitter

In order to explore the influence of the tooth angle of the labyrinth channel on the hydraulic characteristic of emitters, the numerical analysis method of the CFD was used to investigate the influe-nce of tooth angles(50°, 60°, 70°, 80°)of orthodontic-tooth and oblique-tooth labyrinth channels of emitters on flow and velocity field. The results showed that compared with the RNG k-ε model and the SST model, the calculation results of the standard k-ε model are closer to the experimental results. There are mainly two low velocity recirculation areas in the labyrinth channel, namely the upper left side and the lower right side of the labyrinth emitters. Compared with the orthodontic-tooth labyrinth channel, the oblique-tooth labyrinth channel has more low-speed areas on the upper left side and fewer low-speed areas on the lower right side. As the increase of the tooth angle, the flow rate in the emitter increases continuously, especially for the oblique-tooth labyrinth channels, and the increase of the flow rate in the Labyrinth emitter with helical teeth is more obviously affected by the angle between teeth. The flow coefficient of the labyrinth emitter with regular teeth is larger, but the flow pattern index is smaller. The flow index of the orthodontic-tooth labyrinth emitter with an angle of 70° is the smallest among all emitters, so the flow rate of this emitter is the least sensitive to the pressure changes. Compared with other labyrinth-tooth emitters, this emitter has the best hydraulic performance.