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Influence of Tailrace Surge Chamber with Standpipe on Draft Tube Pressure

Standpipe is a connection between surge chamber and tunnel, which can greatly reduce the quantities. This present study deals with how to take the influence of standpipe into consideration and what extent is the influence. The mathematical model of standpipe is established by introducing the method of characteristic. Then the model is applied in one pumped storage power station with long standpipe of 67m. Results show that the standpipe has great influence on whatever tank surge or pressure. And with the increasing standpipe length, the upsurge and minimum draft tube pressure present downtrend. The influence of standpipe in tailrace surge chamber should be considered in design phase. The achievements of the study can serve as a reference for similar projects.