Abstract
Long distance water transportation projects are widely used in balancing water resources and other fields. However, the opening and closing of valves often causes significant pressure changes in the pipeline, whether it is positive or negative pressure, which can cause damage to the pipeline, thereby affecting the actual water transportation project. Therefore, based on the method of characteristics, this paper studies the influence of pipeline diameter, length, friction coefficient and valve closing time on the transient flow in the pipeline. The results indicated that the pressure pulsation inside the pipe is mainly concentrated at 0.4hz and its harmonics. In addition, the frequency with high amplitude mainly ranges from 2.5s to 10s, and the closer it is to the valve, the higher the amplitude at the node.
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