明渠截流龙口型式对龙口流速分布影响试验研究  

The Experimental Study of the Influence of Velocity Distribution of Different Channel Closure Gaps

作　　者：谢春航[1] 董渝[1] 

机构地区：[1]四川大学水利水电学院,四川成都610065

出　　处：《科技视界》2013年第23期5-6,共2页Science & Technology Vision

摘　　要：龙口型式对流速分布的影响研究对实现顺利截流具有重要的指导意义。龙口流速分布受到多种因素影响,包括戗堤布置形状、龙口边界条件等。本文根据某工程明渠截流模型试验结果,对比分析了对于高流速、大落差、高大宽功率条件下的不同龙口布置形式对龙口水流流速分布的影响。得到不同龙口型式下不同龙口宽度时流速分布,分析了龙口型式对龙口水流流态的影响。研究表明:利用弯道离心力作用,增加龙口水流的流动阻力,同时减小截流过程中靠戗堤一侧流速,有利于减小截流料流失率,同时降低截流水力学指标,降低截流难度。The influence study of velocity distribution of different channel closure gap patterns is important. The velocity distribution of different channel closure gaps are affected by many factors, including the layout of the closure dike and the boundary conditions of the closure gap. Contract experiments with different closure gaps have been carried out to get the information of the influence of velocity distribution of different closure gaps with high water velocity, high drop, big unit-wide power. This study shows that use the centrifugal force of the bend can increase the flow resistance and decrease the velocity near the dike. This method can reduce the difficulty of open channel closure.

关 键 词：明渠截流 曲线戗堤 龙口型式 龙口流速分布 

分 类 号：TV131.21[水利工程—水力学及河流动力学]