圆中环沉沙排沙池流速分布规律试验  

Experimental study on velocity distribution in the circular rings desilting and sediment ejection basin

作　　者：张军[1] 侍克斌[2] 高亚平[1] 王进[1] 

机构地区：[1]新疆水利水电勘测设计研究院,新疆乌鲁木齐830000 [2]新疆农业大学水利与土木工程学院,新疆乌鲁木齐830052

出　　处：《水利水电科技进展》2015年第3期34-36,52,共4页Advances in Science and Technology of Water Resources

基　　金：新疆维吾尔自治区自然科学基金(2014211B001)

摘　　要：对一种新型沙水分离装置——圆中环沉沙排沙池进行模型试验研究,对8个径向测试断面的清水流速在径向、垂向和环向的分布进行了测试。试验结果表明:圆中环沉沙排沙池的流速及流速梯度在环向呈不均匀分布,尤以180°径向测试断面流速及流速梯度最大;流速及流速梯度在径向与半径成反比,表层水流流速大小垂向分布与水深成反比;在距离圆心1/2半径以内水流紊动较强,其余半径范围水流紊动弱;中心出水环处流速大小与溢流堰内侧最大相差7.3倍,溢流堰长度是中心出水环的15倍。认为圆中环沉沙排沙池具有较好的沉沙条件的重要原因是溢流堰长度大。A modal experimental study has been carried out on a new water and sediment separation device-circular rings desilting and sediment ejection basin. In this study it has been tested the velocity distribution of eight redial test sections respectively in radial, vertical and circular direction. The results indicate that the distribution of velocity and velocity gradient in the ring direction of circular rings is uneven and the largest numerical value emerges in 180o radial test section. Additionally, velocity and velocity gradient are inversely proportional to the radius in the radial direction, and surface water velocity is inversely proportional to water depth in the vertical direction. Besides, flow turbulence in the distance less than 1/2 radius is strong, while in other distance is weak. Furthermore, velocity in the central outflow ring reaches the maximum value of 7. 3 times that of overflow weir inside, and the overflow weir length is 15 times that of central outflow ring. Overall, the experiment shows that the circular rings have better desilting conditions for the long overflow weir length.

关 键 词：泥沙处理 圆中环沉沙排沙池 流速 流速梯度 

分 类 号：TV673.1[水利工程—水利水电工程]