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research-article

Unsteady RANS Simulations of Wells Turbine under Transient Flow Conditions

[+] Author and Article Information
Qiuhao Hu

Multifunctional Ship Model Towing Tank, School of Naval Architecture Ocean&Civil Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 201100, China
huecu588755@sjtu.edu.cn

Ye Li

Multifunctional Ship Model Towing Tank, School of Naval Architecture Ocean&Civil Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 201100, China
ye.li@sjtu.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4037696 History: Received January 23, 2017; Revised August 11, 2017

Abstract

This paper presents our recent numerical simulations of a high solidity Wells turbine under both steady and unsteady conditions by solving Reynolds-averaged Navier-Stokes (RANS) equations. For steady conditions, the equations are solved in a reference frame with the same angular velocity of the turbine. Good agreement between numerical simulation result and experimental data has been obtained in operational region and incipient stall conditions. The exact value of stall point has been accurately predicted. Through analyzing the detailed fluid fields, we find that the stall occurs near the tip of blade while the boundary layer keeps attached near the hub, due to the effect of radial flow. For unsteady conditions, two types of control methods are studied, constant angular velocity or constant damping moment. For the constant angular velocity, the behaviors of the turbine under both high and low sea wave frequency are calculated to compare with those obtained by quasi-steady method. The hysteresis characteristic can be observed and deeply affects the behaviors of the Wells turbine with high wave frequency. For the constant damping moment, the turbine angular velocity is time-dependent. Under sinusoidal flow, the incident flow velocity in the operational region can be improved to avoid the stall.

Copyright (c) 2017 by ASME
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