Hydraulic Properties Of Throttled Surge Tank

Some essential hydraulic properties of throttled surge tank are carefully analyzed through summarizing the past study. The research includes:1. The development of the throttled surge tank has been introduced systematically.2. Based on the results of experimental data of the tailrace surge tank of Yi Xing pumped-storage Station in Jiangsu province, this research investigates the methods for the head loss coefficients of throttled surge tank with linking pipe by means of the method which incorporates experimental results with theoretical analysis. Based on the head loss coefficients obtained from Gardel's semi-empirical equations for T-junction flow and experiment of welded T-junction, the hydraulic characteristics of throttled surge tank are estimated and compared with those gotten from hydraulic experiment.3. Four different methods of determining the head loss coefficients of throttled surge tank have been employed to investigate the effect of methods afore mentioned on the accuracy of calculating surge and pressure head of throttled surge tank.4. The impacts of both the velocity head and momentum distribution in the T-junction of a tailrace surge tank on the critical stable sectional area of the tank were analyzed by using Gardel's empirical equations for T-junction flow. Based on Thoma's theory, a formula of the critical stable sectional area is derived.5. At the end of this thesis, further research work is suggested.