摘要
水电站变顶高尾水洞常出现明满流交替的复杂流态。为研究变顶高尾水系统的过渡过程,提出了L-F狭缝计算方法,即通过狭缝模型,将明满两种流态采用同一方程组表示,再采用L-F格式离散建立差分方程组,结合边界、初始条件,即可用于明满流的计算。以某大型水电站为实例进行数值模拟,并与实测数据进行比较。结果表明,计算模拟值与实测数据误差较小,证明该方法可模拟变顶高尾水洞的过渡过程,能较准确地反映系统的暂态特性。
The complex flow state of unsteady free - surface pressurized flow often occurs in roof - inclined tailwater tunnels. For studying the transient flow process in roof- inclined tailwater tunnels, the calculation based on L - F slot method was pro- posed, i. e, asing a same equation group to express free flow and pressure flow, establishing the difference equations with Lax - Fried Riches discrete scheme. Then the equations can be solved by the given boundary and initial conditions. Taking a large - scaled hydropower station as the example, the flow fluctuation stability in the transient process was analyzed by means of L - F slot method and the calculation results were compared with measured data. The results show that the method can be used for tran- sient process calculation of roof- inclined tailwater tunnel, revealing the dynamic characteristics of the tailwater system correctly.
出处
《人民长江》
北大核心
2014年第1期73-76,共4页
Yangtze River
基金
中央级科研院所基金项目(CKSF2011014)
关键词
变顶高尾水洞
明满交替流
L—F狭缝法
过渡过程
roof - inclined tailwater tunnel
free - surface and pressurized flow
L - F slot method
transitional process
