| Autor: |
NUKALA, Vasishta Bhargava, PADHY, Chinmaya Prasad |
| Předmět: |
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| Zdroj: |
Romanian Journal of Acoustics & Vibration; 2024, Vol. 21 Issue 1, p20-26, 7p |
| Abstrakt: |
Aerodynamic noise from wind turbines became a prime concern due to demand for wind power. Proper planning regulations must aim at minimizing any deleterious effects of noise on inhabitants near wind farms. Researchers till now have investigated noise from rotating blades of wind turbine with a focus on geometric parameters of blade and little or no research done about the impact of wind velocity profile on broadband noise from large size turbines. This paper investigates the effect of log law and power law wind velocity profile on noise emissions in neutral atmospheric boundary layer conditions. Brooks, Pope & Marcolini and Moriarty & Migliore methods have been implemented for computing turbulent boundary layer trailing edge noise and inflow broadband noise from 2 MW wind turbine. Computational results demonstrate that using power law exponent range of 0.05-0.2, inflow noise increased by 2-5 dB for entire frequency spectra while trailing edge noise increased by 2 dB for frequency below 1 kHz. With log-law profile, the trailing edge noise showed a change of 10 dB while for inflow noise showed a change up to 5 dB when roughness varied from 0.01 to 0.1. The overall noise predicted by both methods using power and log law have been validated with measured data of GE 1.5sle and Siemens SWT turbines at wind speed of 11 m/s. It was found that overall noise obtained using power law agreed with experiment data within 2 dBA while log-law predictions deviate by 4-7 dBA for frequency below 1 kHz and within 1 dBA for frequency higher than 1 kHz. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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