摘要
通过超声多普勒测速仪NDV对已形成冲刷坑的情况下的丁坝流场和紊动动能进行细致的三维测量,结果表明,冲刷坑的存在使得回流范围比平底情况有所减小,较强的紊动动能主要分布在坝头和冲刷坑内,其中以坝头处水流分离区紊动动能最为强烈,主回流区交界处次之。冲刷坑的存在也使得丁坝后回流区的水流和紊动动能分布有较大调整。
In this paper, the NDV （Ultrasonic Doppler velocity meter） was used to measure the three-dimensional flow field and turbulence characteristics around groin when the scour pit was equilibrium. The results show that the backflow region is smaller after the scour pit was formed, and the strong turbulence mainly concentrated in the scour pit and the region near groin head, the strongest turbulence occurs around groin head, and the turbulence on the interface between main stream and backflow is the second place. The distribution of flow field and turbulence intensity in backflow region is also changed greatly because of the scour pit.
出处
《水动力学研究与进展（A辑）》
CSCD
北大核心
2008年第5期560-570,共11页
Chinese Journal of Hydrodynamics
基金
交通部西部交通科技项目(20063280028)
关键词
丁坝
局部冲刷
三维
流场
紊动
groin
the scour pit
three dimensional
flow field
turbulence
