摘要
射流簇底流消能流态特征复杂,近壁旋涡可能影响消能安全。通过大比尺模型试验,研究了典型运行方式下各向旋涡区脉动压力特性。结果表明:旋涡区脉动压力可视作平稳的随机过程;纵轴旋涡强度最大、脉动压力系数为0.042~0.081,立轴旋涡强度其次、脉动压力系数为0.029~0.068,横轴旋涡强度最弱、脉动压力系数为0.025~0.063;频域能量特征揭示了水流的脉动主频和旋涡脱落频率,水流脉动主频低于0.5 Hz,立轴旋涡和横轴旋涡频率约2.5 Hz,纵轴旋涡频率为3.5 Hz。
The flow pattern of energy dissipation by hydraulic jump with jet clusters is very complex, and the near-wall votex may affect energy dissipation security. With large-scale model tests, votex area fluctuating pressure properties under a typical operating mode were studied. The results show that the fluctuating pressure can be regarded as a stationary random process. Longitudinal vortex intensity is the maximum, and the pressure fluctuation coefficient is of 0.042-0.081. Vertical vortex intensity is second, and corresponging pressure fluctuation coefficient is of 0.029-0.068. Horizontal vortex intensity is the minimum, and corresponging pressure fluctuation coefficient is of 0.025-0.063. The energy characteristics in the frequency domain reveal the major frequency of flow fluctuating and vortex frequency. The major frequency of flow fluctuating is lower than 0.5 Hz, the frequency of vertical vortex and horizontal vortex is about 2.5 Hz, and longitudinal vortex frequency is about 3.5 Hz.
作者
张陆陈
王余杰
骆少泽
ZHANG Lu-chen;WANG Yu-jie;LUO Shao-ze(Nanjing Hydraulic Research Institute State Key Laboratory Of Hydrology-Water Resources and Hydraulic Engineering,Nanjing 210029,China;College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China)
出处
《工程力学》
EI
CSCD
北大核心
2018年第A01期355-358,共4页
Engineering Mechanics
基金
国家重点研发计划项目(2016YFC0401901)
国家自然科学基金项目(51409160)
关键词
水利工程
射流簇底流消能
模型试验
近壁旋涡
脉动压力
频域能量特征
water conservancy project
energy dissipation by hydraulic jump with jet clusters
model test
near-wall votex
fluctuating pressure
frequency domain energy characteristics
