摘要
由于台阶式溢流坝坝面台阶的存在,使下泄水流在台阶之间形成横轴旋滚,并与坝面主流发生强烈掺气作用,使水流紊动加剧、掺气增强,大大减少了下泄水流的能量,改善了坝址处的水利条件,使坝下游的消能设施得已简化。结合光明水电站水工模型试验,对消能率进行了研究,结果表明:影响台阶坝面消能率的主要因素为台阶坝高、台阶的突出高度、台阶坝的坡度和单宽流量。同时推导出消能率的计算公式。该公式可为相关设计提供参考。
As a result of the existence of stepped spillway dam, water discharged in the steps forms a horizontal rotation between steps and produces the violence gas action along the mainstream of dam surface, which make flow turbulence prick up, aeration increased significantly reduces the discharge of flow energy, improve the water resource condition of the site of the dam, and predigest the energy dissipation facilities downstream dam. Combination with Guangming hydropower station and Hydraulic model test, the rate of energy dissipation has been studied, results showed that： the main factors of the impact of the energy dissipation ratio of stepped dam surface are the height of dam; extrude height of the stepped, the slope of and unit flow. At the same time, it derived the rate of energy dissipation formula which can provide a reference for the same kind of designs.
出处
《吉林水利》
2009年第8期28-30,33,共4页
Jilin Water Resources
关键词
台阶式溢洪道
台阶武溢流坝
消能率
比尺
糙率
水工模型试验
Stepped Spillways
stepped overflow dam
energy dissipation rate
scale
roughness
hydraulic model test
