摘要
本文通过孔口出流平底二元自由水跃5个相对比尺的132组模型试验,获得了水跃区内底板上跃首佛氏数从2.94～8.61,雷诺数从2×10~4～6×10~5的水流脉动压力资料。对不同比尺的试验结果进行对比分析,推导了水流脉动压力的幅值和频率比尺。得到的结果是脉动压力的幅值比尺为模型长度比尺,即P_T~′=L(?)符合重力相似律。脉动压力的频率比尺为1,即f_T=1不符合重力相似律。
This paper deals with similarity of fluctuating pressure of a two-dimensional hydraulic jump on the apron below the outlet, which were tested on five different scale models witn relative ratio from 1 :1 to 1:10, 132 sets of data were measured on these models. The Froude number of the flow at the constriction section in the test is ranging from 2. 94 to 8. 61 ,the Reynolds number from 2.0 × 104 to 6× 105. From data analysis, it is concluded that the similarity theory of fluctuating pressure in flow of the hydraulic jump region is Pr = LT, fr = 1.
出处
《长江科学院院报》
CSCD
北大核心
1991年第4期1-9,共9页
Journal of Changjiang River Scientific Research Institute
关键词
水跃区
压力脉动
水流
佛劳德数
Froude number
Reynolds number
law of gravity similarity
amplitude scale of fluctuating pressure
frequency scale of fluctuating pressure
