Influence of runner clearance on efficiency and cavitation in kaplan turbine

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

Chen, Q.F.^1 ; Luo, Y.Y.^1 ; Li, X.G.^2,3 ; Ahn, S.H.^1 ; Zhang, J.^1 ; Wang, Z.W.^1 ; Xiao, Y.X.^1

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

100084, China^1

Tianjin Tianfa Heavy Machinery and Hydro Power Equipment Manufacture Co., Ltd, Tianjin

300405, China^2

Key Laboratory of Tianjin Tianfa Heavy Machinery and Hydro Power Equipment Manufacture, Tianjin

300405, China^3

关键词: Cavitation performance;    Hydraulic characteristic;    Hydraulic performance;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/163/1/012068/pdf
DOI  :  10.1088/1755-1315/163/1/012068

来源: IOP

【 摘 要 】

Since the clearance between the runner shroud and the hub can change with the angle of the blades, it has a great influence on the hydraulic characteristics and cavitation performance in the Kaplan Turbine. In this paper, the CFD will be used to solve the turbulence model based on the k-ωSST model in the entire flow field of the turbine and the Zwart-Gerber-Belamri model will be used to predict the cavitation. We compare the hydraulic characteristics and cavitation performance of the Kaplan Turbine under the conditions of the runner clearance exist or the runner clearance absence. Finally, we analysis the influence of the clearance width in the hydraulic performance and the relationship between the clearances and the turbine characteristics.