摘要
对明渠流中局部断面侧收缩引起的卡克水流现象进行了系统分析 .根据能量守恒和水流连续方程 ,建立了缓坡及陡坡条件下卡克水流的临界判别条件。所提出的判别公式 ,克服了Yarnell理论公式忽略能量损失的不足 ,能够准确地确定侧收缩引起的卡克水流发生的临界收缩程度 。
The choking flow phenomenon caused by local lateral contraction is studied theoretically. The equations for determining the limit opening ratio, one for flow with mild slope and one for steep slope, are deduced based on the principle of energy conservation and continuity. It is pointed out that the traditional formula suggested by Yarnell dramatically deviates from measurement due to the neglect of energy losses. The equation proposed in this paper takes the energy losses of local contraction into account so that it can accurately predict the threshold opening ratios of choking.
出处
《水利学报》
EI
CSCD
北大核心
2002年第8期12-20,共9页
Journal of Hydraulic Engineering
基金
清华大学水利系基础研究基金
关键词
卡克水流
临界条件
局部收缩
侧收缩
明渠流
水力学
choking flow
threshold
discriminant
local contraction
lateral contraction
open channel flow
