R型水跃局部水头损失系数与跃后水深的计算

通过能量方程研究R型突扩水跃局部水头损失系数,完善水跃跃后水深计算的理论方法,为消力池跃后水深的计算提供新的思路。通过建立消力池出口扩散断面和跃后断面的能量方程,分析R型突扩水跃局部水头损失系数和水跃水深比的变化规律。结果发现:R型水跃相对局部水头损失系数是突然扩散断面弗劳德数和消力池突扩比的函数;相对局部水头损失系数既服从线性分布,又服从乘幂分布;水跃水深比是跃前断面弗劳德数和消力池突扩比的函数。提出了局部水头损失系数和水跃水深比的计算公式,并分别对其进行了验证。

Calculating Local Head Loss Coefficient and Sequent Depth ofR-jump in an Abruptly Expanding Stilling Basin

A method of calculating the local head loss coefficient of R-type hydraulic jump via energy equation is provided to improve the theoretical calculation of sequent depth of hydraulic jump. The energy equations for the outlet’s abruptly expanding section and the subcritical flow section are established to analyze the change law of local head loss coefficient and conjugate depth ratio of R-jump in an abruptly expanding stilling basin. Result shows that relative local head loss coefficient is the function of the Froude number of outlet’s abruptly expanding section and the abruptly expanding ratio of stilling basin. The local head loss coefficient conforms to linear distribution and exponentiation distribution. Moreover, conjugate depth ratio is the function of the Froude number of outlet’s abruptly expanding section and the abruptly expanding ratio. The calculation equations for the local head loss coefficient and the conjugate depth ratio are proposed and verified.