Effect of Upstream Side Flow of Wind Turbine on Aerodynamic Noise: Simulation Using Open-Loop Vibration in the Rod in Rod-Airfoil Configuration

Mohammad Souri,Farshad Moradi Kashkooli,Madjid Soltani,Kaamran Raahemifar

doi:10.3390/en14041170

Abstract

Adaptive and flexible control techniques have recently been examined as methods of controlling flow and reducing the potential noise in vertical axis wind turbines. Two-Dimensional (2D) fluid flow simulation around rod-airfoil is addressed in this study as a simple component of the wind turbine by using Unsteady Reynolds Averaged Navier–Stokes (URANS) equations for prediction of noise using Ffowcs Williams-Hawkings (FW-H) analogy. To control the flow and reduce noise, the active controlling vibration rod method is utilized with a maximum displacement ranging from 0.01 C to 1 C (C: airfoil chord). Acoustic assessment indicates that the leading edge of the blade produces noise, that by applying vibration in cylinder, blade noise in 0.1 C and 1 C decreases by 22 dB and 35 dB, respectively. Applying vibration is aerodynamically helpful since it reduces the fluctuations in the airfoil lift force by approximately 48% and those in the rod by about 46%. Strouhal assessment (frequency) shows that application of control is accompanied by 20% increase. Applying vibration in the rod reduces the flow fluctuations around the blade, thus reduces the wind turbine blade noise. This idea, as a simple example, can be used to study the incoming flow to turbines and their blades that are affected by the upstream flow.

Highlights

Loss of fossil energy sources and global warming has led to the little economic acknowledgment of carbon as an international strategy for sustainable development [1].there has been an increase in the demand for green and renewable energies.Among different types of renewable energies, wind has had incredible growth all over the world and plays a significant role in the future economy [2]
The aerodynamic noise generated by wind turbines, as one of the main sources of noise pollution, has always seriously challenged engineers, because the generated noise has reduced the quality of life near residential areas
Validation of acoustics and aerodynamic parameters is made to examine the validity of the current study

Summary

Introduction

Loss of fossil energy sources and global warming has led to the little economic acknowledgment of carbon as an international strategy for sustainable development [1].there has been an increase in the demand for green and renewable energies.Among different types of renewable energies, wind has had incredible growth all over the world and plays a significant role in the future economy [2]. Loss of fossil energy sources and global warming has led to the little economic acknowledgment of carbon as an international strategy for sustainable development [1]. There has been an increase in the demand for green and renewable energies. Among different types of renewable energies, wind has had incredible growth all over the world and plays a significant role in the future economy [2]. As a sustainable energy source, wind energy can be an important factor in increasing energy production in different countries and international politics. With the worldwide spread of wind plants and wind farms, it would be necessary to investigate different aspects of wind energy, especially the environmental aspect, along with finding appropriate ways to increase its efficiency [3].

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