雪卡水电站长引水渠道的水力瞬变计算

在雪卡水电站长引水渠道的水力瞬变计算中,应用一维明渠非恒定流方程及其相应的初边界条件,通过数值求解进行电站长引水渠道各种工况运行下的水力设计,并进行了复核计算.重点研究了在机组增、甩负荷时,瞬变运行状况下的非恒定流运动,对工程是否采用溢流侧堰进行了对比计算,得到了电站各种运行工况下渠道瞬态水面线、流速、前池侧堰的溢流过程线等,为合理确定渠道断面尺寸、比降、前池大小、侧堰宽度、堰顶高程及压力钢管进口高程等提供了依据.比设计《规范》提供了更全面、更合理的水力信息,又弥补了水工模型试验模拟长距离输水的缺陷,建议在同类工程中推广使用.

Computation of transient flow in long diversion channel for Xueka Hydropower Station

Utilizing the one-dimensional unsteady flow computational equation and the corresponding boundary conditions to calculate the transient flow of long diversion channel for Xueka Hydropower Station;the hydraulic parameters by numerical solution are designed and corrected.On the basis of the computed results under normal condition,the unsteady transient flows when hydraulic turbine set increases or decreases load,are studied emphatically.The results of two calculation programs with an overflow side weir and without it are compared.All kinds of conditions of transient water diversion such as water level,velocity and the process line of overflow side weir are obtained;the references for channel section size,slope,size of forebay,wide of side weir,altitude of side weir and altitude of pressure penstocks are provided.It provided more comprehensive and reasonable informations than normal hydraulic standardization,make up for the defects of simulation of long distance experiments in hydraulic model,it could be extended to use in the similar engineering.