Performance prediction and flow analysis of pump operation of tidal unit with bilateral vanes

Tubular reversible pump-turbine is a special machine used in tidal power, tidal fluctuation by affecting its working head was positive and negative periodic alternation, so the operating conditions of turbine power generation not only, also includes forward and reverse pump operation. A lot of researches have been done on the turbine operation at home and abroad, and a relatively mature bi-directional "s" airfoil blade has been designed, and good power generation performance has been obtained in both forward and backward directions by adding bilateral guide vanes. However, the study on the conditions of pump operation has proved dissatisfactory. In this paper, the steady numerical simulation of a water pump-turbine with bilateral guide vanes is carried out, and the internal flow of the pump operation is analyzed. The results show that by adjusting the front and rear of guide vane and blade angle combination relationship, forward and reverse operation of the pump efficiency can be as high as 83.83% and 58.07%. The experimental research of increasing the unit pump condition is of great significance to the development of large tide unit.