Influence of gravity on hydraulic performance evaluation of an axial flow turbine

Asian Working Group- IAHR's Symposium on Hydraulic Machinery and Systems

Lei, H.M.^1 ; Chen, F.N.^1 ; Ahn, S.H.^1 ; Xiao, Y.X.^1 ; Zhou, X.J.^2,3 ; Zeng, C.J.^1 ; Fan, H.G.^1 ; Wang, Z.W.^1

State Key Laboratory of Hydro Science and Engineering, Department of Thermal Engineering, Tsinghua University, Beijing

100084, China^1

Tianjin Tianfa Heavy Machineryand Hydro Power Equipment Manufacture Co., Ltd, Tianjin

300405, China^2

Key Laboratory of Tianjin Tianfa Heavy Machineryand Hydro Power Equipment Manufacture Tianjin, Tianjin

300405, China^3

关键词: Axial flow turbines;    Axial turbine;    Gravity field;    Guide vane;    Hydraulic performance;    Opening degree;    Turbulent models;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/163/1/012028/pdf
DOI  :  10.1088/1755-1315/163/1/012028

来源: IOP

【 摘 要 】

This paper want to analyse the influence of gravity in the axial turbine. In this paper, the influence of axial turbine on the gravity field of different runner diameter is analyzed at the same head, the same opening degree of the guide vanes and runners and the same unit speed. The turbulent model is SST. And in these calculations I consider the impact of runner gap. According to the simulation, when the Fr exceeds 2.3355, the effect of gravity is negligible. When Fr less than 2.3355, the efficiency, flow rate and power considering the gravity are greater than the case without considering gravity. The lower surface of the runner is prone to cavitation when gravity is considered. With the decrease in the diameter of the runner, the difference in pressure distribution between considering the gravity and without consideration of gravity is reduced.