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为计算水电站在负荷变动下渠道和压力前池的水位波动过程、分析渠道末端扩散段和压力前池对明渠水位波动的影响,基于明渠和有压管非恒定流理论,采用特征线法求解明渠和压力管道的圣维南方程组、变时步特征线法解决无压渠道和压力管道不同时间步长,构建了“无压引水渠道+扩散段+压力前池+压力钢管”数学模型,并利用Matlab软件编制相应的计算程序。
In order to calculate the fluctuating process of water level of channel and pressure forecake under fluctuating load, the influence of channel end divergence section and pressure forebay on the fluctuation of open channel water level is analyzed. Based on the unsteady flow theory of open channel and pressurized pipe, And the Shengweinan equations of the pressure pipeline, the time-varying characteristic line method is used to solve the different time steps of the pressureless pipeline and the pressure pipeline, and the mathematical model of “pressureless diversion channel + diffusion section + pressure foretack + pressure steel pipe” , And use Matlab software to prepare the corresponding calculation program.