【作者】 姚莉； 杨文利；

【Author】 YAO Li;YANG Wen-li;School of Water Conservancy and Ecological Engineering,Nanchang Institute of Technology;

【机构】 南昌工程学院水利与生态工程学院；

【摘要】 本世纪以来,由于一批高坝和超高坝的建设,泄洪消能问题面临严峻挑战。窄缝消能工已较好地运用于"高水头、大流量、窄峡谷"等特点的水利工程。本文在传统窄缝消能工的基础上,对一种侧壁齿坎窄缝消能工的流态和消能特性进行了研究。研究结果表明:①壁齿坎收缩式消能工射流水舌存在着3种流态:"非工作"流态、"临界"流态和"工作"流态;②能工在"临界"流态时的水流佛氏数Fr远比传统窄缝消能工相应的Fr低,③于侧壁齿坎窄缝消能工的分层作用,其消能效果明显优于传统的窄缝消能工。在本文研究的条件下,其消能率比传统的窄缝消能工增加约5%。更多还原

【Abstract】 Flow regimes and energy dissipation are both the serious concerns for the design of hydraulic structures.In the previous work,a kind of multiple slit-type energy dissipaters(M-STED) was developed,and its higher energy dissipation was demonstrated comparing with the traditional slit-type ones(STED).In this study,based on dimensional analysis,classifications of flow regimes by empirical correlations are presented,the critical conditions of the flow regime conversion of the M-STED were experimentally investigated through three sets of those physical models with nine cases,and comparisons were conducted between the results of both the STED and M-STED.Meanwhile,under the present conditions,the results concluded that the M-STED increased the relative energy dissipation ratio by nearly 5%comparing with the STED.更多还原