消力池长度对池内水力特性的影响研究

Research on Different Length of Spillway Basin Effecting on Hydraulic Characteristics

底流消能是一种应用广泛并且工程实践优良的消能工形式,池长是决定其消能表现的一项决定性因素。本文针对两种池长的消力池进行了研究,对水流流态、时均压强、脉动压强以及消能效率等水力特性进行了测量和对比分析。结果表明:加长消力池有助于降低池内各项水力学指标,同时还能改善出池水流与下游河道水流的衔接状态,且池长的增大对消力池的总消能效率影响也相对较小。

Energy dissipation by hydraulic jump is a kind of energy dissipation works which is widely used,and is well known in water project construction practice.Length of spillway basin is a decisive factor which effects on hydraulic characteristics of flow in the basin.In this paper,the author studied spillway basin with two lengths,and measured and compared their hydraulic characteristics,including flow state,time averaged pressure,pulsating pressure,energy dissipation rate,and so on.The result shows that lengthening spillway basin is helpful to reducing every hydraulic index in the basin,also improving the joining state between the flow out of basin and the flow in downstream river,and the increase of the length is relatively small in effecting on total energy dissipation rate of the basin.