Blunt airfoil noise emission

Abstract

This thesis investigates the influence of trailing edge thickness on noise emission from the NACA64418 airfoil. Numerical simulations using OpenFOAM are conducted to analyse the aerodynamic and acoustic characteristics. The objective is to understand the impact of varying trailing edge thickness on noise levels.
The study explores different trailing edge thickness configurations, ranging from thin to thick. Aerodynamic performance, in terms of drag and lift coefficients, is evaluated alongside noise emission levels.
Results show that trailing edge thickness significantly affects noise emission. Thicker trailing edges exhibit higher noise levels due to increased flow separation and turbulence intensity.
The findings contribute to understanding the relationship between airfoil geometry and noise generation. Optimizing trailing edge thickness can reduce noise without compromising aerodynamic performance.
The research has practical implications for designing quieter and more efficient airfoils in applications such as aircraft wings and wind turbine blades.

Popular Abstract

Exploring the influence of different parameters on noise emission in wind turbines
Introduction:
Embark on a fascinating exploration into the realm of wind energy engineering as this research delves into the intricate factors that influence noise emission in wind turbines. Through advanced computational fluid dynamics (CFD) simulations using OpenFOAM, this study examines the effects of airfoil parameters, including trailing edge thickness and angles of attack, as well as the influence of microphone positions on noise levels. The findings contribute to the development of quieter and more efficient wind turbine designs.
Understanding the Role of Airfoil Parameters in Noise Emission:
This degree project focuses on unravelling the complex relationship between airfoil parameters and noise emission in wind turbines. By varying the trailing edge thickness and angles of attack, the study investigates how these factors impact the generation and propagation of noise in turbulent flow conditions.
Unveiling the Influence of Microphone Positions:
In addition to airfoil parameters, this research examines the influence of microphone positions on noise measurement in wind turbines. By strategically placing microphones at different locations, including perpendicular distances to the trailing edge stream, the study aims to understand how microphone position affects the captured noise signals.
Key Findings and Noteworthy Results:
The research yields significant insights into the effects of airfoil parameters and microphone positions on noise emission in wind turbines. It reveals that thinner trailing edge profiles tend to contribute to lower noise levels, while variations in angles of attack exhibit a notable impact. Moreover, the study uncovers the limited influence of microphone positions on the measured noise, suggesting that the position of microphones does not significantly affect the captured noise signals.
Addressing the Need for Quieter Wind Turbines:
The reduction of noise emissions from wind turbines is a crucial requirement for the acceptance and sustainable development of wind energy projects. By investigating the impact of airfoil parameters and microphone positions, this study contributes to addressing this need by providing valuable insights for designing quieter wind turbine blades. The findings support the development of wind turbines that minimize noise disturbance and promote better community acceptance.
Practical Applications and Future Impact:
The practical applications of this research extend to the design and development of wind turbines. The insights gained from studying airfoil parameters and microphone positions can be utilized to optimize blade designs, reduce noise emissions, and enhance the overall performance and efficiency of wind energy systems. These advancements contribute to the expansion of sustainable energy sources and facilitate a positive environmental impact.
Surprising Connections and Further Exploration:
In addition to the expected relationships between airfoil parameters and noise emission, the study may reveal unexpected connections or intriguing details in the data analysis. These surprising findings can inspire further investigations and open up new avenues of research to explore the intricate dynamics of noise generation and mitigation in wind turbines.
Conclusion:
Through an in-depth analysis of airfoil parameters and microphone positions, this thesis provides valuable insights into the factors influencing noise emission in wind turbines. By investigating the impact of trailing edge thickness, angles of attack, and microphone positions, the research contributes to the development of quieter and more efficient wind turbine designs. The findings support the ongoing efforts to mitigate noise pollution and promote the widespread adoption of sustainable wind energy, paving the way for a greener and more harmonious future.

• author: Torres Güere, Naomi Kimberly
• supervisor: Johan Revstedt; Erik Sloth
• organization: Department of Energy Sciences
• course: MVKM05 20231
• year: 2023
• type: H2 - Master's Degree (Two Years)
• subject: Technology and Engineering
• keywords: wind turbines, noise emission, computational fluid dynamics (CFD), OpenFOAM, Aerodynamics, aeroacoustics, sustainable energy, wind energy
• report number: LUTMDN/TMHP-23/5529-SE
• ISSN: 0282-1990
• language: English
• id: 9127061
• date added to LUP: 2023-06-19 12:36:21
• date last changed: 2023-06-19 12:36:21