摘要
深淹没底孔泄洪时由于相邻底孔泄洪闸出水口存在横向间隙极易引起高速出闸水流呈大角度交汇、碰撞、引起持续性不良水翅,影响底孔泄流能力以及下游水流流态。结合工程实例利用物理模型针对该问题在泄洪闸下游出口分别布置椭圆形隔墩以及楔形隔墩,并对比泄洪闸水流流态以及下游明渠内沿程断面水深及流速。试验表明:楔形隔墩有利于改善相邻闸室阿高速出闸水流表中底层交汇、调整明渠进水口流层分布,其既满足导流设计要求、维持上游原有围堰设计结构、避免设计变更,又能有效地改善下游明渠内水流流态,使明渠内下泄水流横向分布更加均匀、消除折冲水流。
Aimed at the attendant adverse swirl in the front of bottom hole and persistent adverse water-wing outside the bottom hole due to large lateral space between adjacent sluice,this paper comparatively proposes installing oval pier and wedge pier downstream the bottom hole.Results show that wedge pier program can not only adjust velocity distribution to avoid deflected stream in the downstream of open diversion channel,but also meet the requirements of diversion design flood,which will maintain the original cofferdam structure and avoid design alteration to save construction investment.
作者
查龙青
周招
黄曼茹
ZHA Long-ling1,2, ZHOU Zhao2, HUANG Man-ru3(1.East China Engineering Science and Technology Co., Ltd, Hefei 230024, China; 2,State Key Laboratory of Water Resources and Hydropower Engineering Science , Wuhan University,Wuhan 430072, China; 3.Changjiang River Scientific Research Institute, Wuhan 430010. Chin)
出处
《中国农村水利水电》
北大核心
2018年第5期166-169,172,共5页
China Rural Water and Hydropower
