Abstract
This paper presents the aerodynamic design of low noise wind turbine blades using Betz and Joukowski concepts. The aerodynamic model is based on Blade Element Momentum theory whereas the aeroacoustic prediction model is based on the BPM model. The investigation is started with a 3MW baseline/reference turbine rotor with a diameter of 80 m. To reduce the noise emission from the baseline rotor, the rotor is reconstructed with the low noise CQU-DTU-LN1 series of airfoils which has been tested in the acoustic wind tunnel located at Virginia Tech. Finally, 3MW low noise turbine rotors are designed using the concepts of Betz and Joukowski, and the CQU-DTU-LN1 series of airfoils. Performance analysis shows that the newly designed turbine rotors can achieve an overall noise reduction of 6 dB and 1.5 dB(A) with a similar power output as compared to the reference rotor.
Highlights
Wind energy is developing very fast in the world
Most of the wind turbine manufacturers are using the Glauert concept based on Blade Element Momentum (BEM) theory [3] with existing airfoils that were developed in the aeronautic industry for enhancing aerodynamic performance and not optimized regarding to noise
Performance of the reference rotor To get an idea of noise emission from a commercial wind turbine, we chose the 3MW wind turbine as the reference wind turbine
Summary
Wind energy is developing very fast in the world. To reduce CO2 emission from fossil energy and alleviate global warming, governmental targets in developing wind energy are very ambitious in most countries. Most of the wind turbine manufacturers are using the Glauert concept based on Blade Element Momentum (BEM) theory [3] with existing airfoils that were developed in the aeronautic industry for enhancing aerodynamic performance and not optimized regarding to noise. The developed Betz and Joukowski concepts in [5] will be further used for designing low noise wind turbine rotors. For an identical operating conditions (1) after which the Joukowski model gives a by a direct calculation and the Betz one by using (2) the chord distribution in the radial direction has been calculated by the same formulas c(r )Cn. where the flow angle φ should be defined like a by different ways for both rotor concepts. Summary of the employed numerical tools we present briefly the numerical models used for analysing both aerodynamic and aeroacoustic performance of wind turbine rotors
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