燕尾挑坎挑射水流数值模拟

Numerical Simulation of the Jet Nappe in Swallow-tailed Flip Bucket

采用Fluent计算软件对溢洪道出口燕尾型挑坎挑射水舌进行了三维数值模拟。计算得到水舌形态、水舌速度的分布情况。水舌宽度沿纵向迅速减小,拉伸充分,降低了单位面积内的入水量;大部分水体由底部开口射出,最大流速亦集中在底端,“燕翅”部分水体较少但掺气明显,速度较底部偏低,研究结果表明本文数值模拟方法具有良好的合理性和可靠性。

The Fluent calculation software was applied to simulate the water-air two-phase jet flow of swallow-tailed flip bucket.The shape of tongue,the distribution of velocity were simulated.The width of the tongue was longitudinally decreased rapidly,fully stretching and reduced the influx of water in unit area;large amount of waters jetted from the opening of the bottom,the maximum velocity also concentrated at the bottom,the waters of the wing part was rather small and mixed with air obviously,the velocity was rather low compared with the bottom.The result indicated the numerical simulation method in this paper was highly reliable and rational.