摘要
台阶式溢洪道水流流态复杂,其水流脉动直接影响到水利工程的安全,为论证某水库台阶式溢洪道的安全性,采用物理模型试验方法,对台阶式溢洪道脉动压强特性进行研究。结果表明,台阶式溢洪道底板脉动压强是随时间变化的平稳随机过程;脉动压强强度在台阶凹角和中点处相差不大,从台阶面中点向凸角处逐渐增大;脉动压强强度沿程交替出现波峰和波谷,呈波浪状变化,并随流量的增加而增大;台阶式溢洪道脉动优势频率主要集中在0~2 Hz,属低频振动。研究成果可为类似工程的优化设计提供参考。
The flow pattern is complex on stepped spillway,and its flow pulsating directly affect the safety of the water conservancy project,to prove the safety of the stepped spillway of a reservoir,used the physical model test method,studied on fluctuating pressure characteristics of stepped spillway. The results show that fluctuating pressure is time-varying stationary random process on stepped spillway floor. Fluctuating pressure intensity are similar on the steps nook and midpoint,and it increases gradually from step's midpoint to salient on step's surface. Fluctuating pressure intensity appears along alternating peaks and troughs,and presents wavy development. Fluctuating pressure intensity shows increasing trend with the flow traffic increasing. The dominant frequencies of fluctuations mainly concentrate in0 ~ 2HZ on stepped spillway,belong to the low-frequency vibration. The research results can provide reference for the design of similar projects.
出处
《人民珠江》
2016年第9期36-39,共4页
Pearl River
关键词
台阶式溢洪道
脉动压强
模型试验
频率
stepped spillway
fluctuating pressure
model test
frequency
