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research-article

Numerical investigation of added mass and hydrodynamic damping on a blunt trailing edge hydrofoil

[+] Author and Article Information
Yongshun Zeng

College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
15652936312@163.com

Zhifeng Yao

College of Water Resources and Civil Engineering, China Agricultural University, Beijing, 100083, China; Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System, Beijing 100083, China
yzf@cau.edu.cn

Jiangyong Gao

Chinese Academy of Agricultural Mechanization Sciences, Beijing 100083, China
gao_jiangyong@163.com

Yiping Hong

College of Water Resources and Civil Engineering, China Agricultural University, Beijing, 100083, China; Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System, Beijing 100083, China
yphong@cau.edu.cn

Fujun Wang

College of Water Resources and Civil Engineering, China Agricultural University, Beijing, 100083, China; Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System, Beijing 100083, China
wangfj@cau.edu.cn

Fang Zhang

Cardiosquare, Inc., 242 Lakeland Crescent, Richmond Hill, ON L4E 3A7, Canada
zfang98@gmail.com

1Corresponding author.

ASME doi:10.1115/1.4042759 History: Received September 05, 2018; Revised February 05, 2019

Abstract

Added mass and hydrodynamic damping play significant roles in fluid-structure interaction (FSI) in hydraulic turbines. Added mass can reduce natural frequencies, while hydrodynamic damping could result in a higher amplitude decay speed of the vibration. In order to quantify the added mass and hydrodynamic damping of a three-dimensional NACA 0009 hydrofoil with a blunt trailing edge, a two-way FSI simulation method was employed. The effects of grid scale, time step, turbulence model, exciting force and numerical damping on the calculation accuracy of the two-way FSI numerical simulation were analyzed in great detail through comparison with the previously published experimental data. Hydraulic force was obtained by using a transitional SST model at the flow region of the Reynolds number ReL=0.2×106-2×106. The vortex shedding frequency, the natural frequency of the first-order bending mode in water and the hydrodynamic damping ratio obtained from the numerical simulations agree well with the experimental data, with maximum deviations in 6.12%, 4.53% and 8.82%, respectively. As the flow velocity increases, the natural frequency may not significantly change, while the added mass coefficient gradually increases, considering the effect of added stiffness. Above the first-order bending mode lock-in region, the results indicate that the first-order bending mode hydrodynamic damping ratio increases linearly with velocity. The present numerical achievements offer a higher level of accuracy for predicting the added mass and hydrodynamic damping characteristics of a hydrofoil.

Copyright (c) 2019 by ASME
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