Cost-effective CFD for vortex shedding from a trailing edge of hydraulic turbine blade

29th IAHR Symposium on Hydraulic Machinery and Systems

Kurosawa, Sadao^1 ; Nakazono, Masahiko^1

Hydraulic Machinery Group, Rotating Machine Technology R and D Department Power, Industrial Systems RandD Center, Research and Development Div. Toshiba Corporation, 20-1, Kansei-cho, Tsurumi-ku, Yokohama

230-0034, Japan^1

关键词: Analysis method;    Cost effective;    Hydraulic force;    Hydraulic turbine blade;    ITS applications;    Turbine runner;    Velocity fluctuations;    Vortex shedding patterns;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/240/7/072016/pdf
DOI  :  10.1088/1755-1315/240/7/072016

来源: IOP

【 摘 要 】

This paper describes the method for analysing the vortex from a trailing edge of the blade with high accuracy using CFD. As for the analysis method, RANS and LES hybrid model, which is a combination of RANS with a low calculation load and LES with a high calculation load, was used on understanding the turbine-scale phenomenon with a relatively low calculation load. As for the first step its application as a turbine runner, we conducted the case study in which the blade model was fixed in a uniform and we confirmed that the present CFD could be predicted the vortex shedding phenomena, such as power spectra of velocity fluctuations, wake fluctuation, vortex shedding pattern and hydraulic force acting on the blade etc.