论文部分内容阅读
考虑管径、管道倾角、管道首末高程等的影响,建立压力管道排水计算数学模型,得到排水时间与排水阀开度之间存在反比关系.以压力管道允许水位消落速度和排水阀允许流速作为限制条件,选择合适的排水阀开度,最终确定排水时间.以某引水式水电站为例进行计算分析,获得符合各方面要求的排水步骤.分析发现,压力管道上平段主要受排水阀允许流速的限制,排水速度较快;竖井段主要受水位消落速度的限制,排水耗时较长;下平段水头小,排除少量水体也需要较长时间.
Taking into account the influence of pipe diameter, pipe inclination and the height of the pipeline, the mathematical model of the drainage pipe of pressure pipe is established, and the inverse relationship between the drainage time and the opening of the drainage valve is established. Taking the allowable drop of water level and the allowable flow rate As a limitation, select the appropriate drainage valve opening, and finally determine the drainage time.With a water diversion hydropower station as an example for calculation and analysis, obtained in line with all aspects of drainage steps.It was found that the pressure on the flat section of the pipeline is mainly allowed by the drainage valve The flow rate is limited and the drainage speed is faster; the shaft section is mainly limited by the drop-off speed of the water level and takes a long time to drain; the head of the lower flat section is small and it takes a long time to exclude a small amount of water body.