Experimental Investigation of Aerodynamic Noise Characteristics of Tandem Asymmetric Airfoils Across Varied Angles of Attack

Shi, W.; Li, Y.; Zhou, J.; Chen, Z.

doi:10.47176/jafm.17.12.2690

Experimental Investigation of Aerodynamic Noise Characteristics of Tandem Asymmetric Airfoils Across Varied Angles of Attack

Document Type : Regular Article

Authors

¹ College of Mechanical and Electrical Engineering, Wenzhou University, Wenzhou, Zhejiang 325035 China

² Key Laboratory of Aerodynamic Noise Control, China Aerodynamics Research and Development Center, Mianyang, Sichuan, 621000, China

10.47176/jafm.17.12.2690

Abstract

This paper experimentally investigates the aerodynamic noise characteristics of a tandem asymmetric airfoil-airfoil at different angles of attack in the 0.5 m×0.4 m acoustic wind tunnel at Wenzhou University. Based on the airfoil chord length and the wind speed, the Reynolds number ranges between 2.2×10⁵ and 3.5×10⁵. Meanwhile, the attack angle (α₁ and α₂) of both tandem airfoils varies between 0~20°, and the noise is measured using a far/near-field microphone array. The experimental results indicate that when the attack angle α₁ of the upstream airfoil is small (α₁<15°), its wake hardly interacts with the downstream airfoil, and the noise source is mainly concentrated at the trailing edge of the upstream airfoil. When the attack angle α₁ is larger than 15°, the upstream wake interacts with the downstream airfoil, the noise radiates from the leading edge of the downstream airfoil, and the source location varies slightly at different frequencies. Compared to the upstream attack angle α₁, the downstream airfoil attack angle α₂ has less impact on the aerodynamic noise of the tandem airfoils. Additionally, the particle imaging velocimetry technique is employed to measure the flow field characteristics and analyze the mechanism of noise production.

Keywords

Main Subjects

Acoustics

References

Arcondoulis, E., Doolan, C., Brooks, L., Zander, A. (2012). On the generation of airfoil tonal noise at zero angle of attack and low to moderate Reynolds number. 18th AIAA/CEAS Aeroacoustics Conference (33rd AIAA Aeroacoustics Conference), 2060. https://doi.org/10.2514/6.2012-2060

Fink, M. R. (1975). Prediction of airfoil tone frequencies. Journal of Aircraft, 12(2), 118-120. https://doi.org/10.2514/3.44421.

Gruber, M. (2012). Airfoil noise reduction by edge treatments. Diss. University of Southampton. http://eprints.soton.ac.uk/id/eprint/349012

Jacob, M, C., Boudet, J., Casalino, D., & Michard, M. (2005). A rod-airfoil experiment as a benchmark for broadband noise modeling. Theoretical and Computational Fluid Dynamics, 19(3), 171-196. https://doi.org/10.1007/s00162-004-0108-6

Li, Y., & Niu, X. F. (2022). Rod–airfoil interaction noise at different rod cross sections and airfoil angles. AIAA Journal, 60(6), 3635-3650. https://doi.org/10.2514/1.J061303i

Li, Y., Wang, X., Chen, Z., Chen, Z., & Li, Z. (2014). Experimental study of vortex–structure interaction noise radiated from rod–airfoil configurations. Journal of Fluids and Structures, 51, 313-325. https://doi.org/10.1016/j.jfluidstructs.2014.08.014

Liu, X. (2018). Aerodynamic and wake development of aerofoils with trailing-edge serrations [Ph.D. thesis, University of Bristol]. https://research-information.bris.ac.uk/ws/portalfiles/portal/181451764/Final_Copy_2018_11_06_Liu_X_PhD.pdf

Longhouse, R. E. (1976). Noise mechanism separation and design considerations for low tip-speed axial-flow fans. Journal of Sound and Vibration, 48(4), 461-474. https://doi.org/10.1016/0022460X(76)90550-2.

McAlpine, A., Nash, E. C., & Lowson, M. V. (1999). On the generation of discrete frequency tones by the flow around an aerofoil. Journal of Sound and Vibration, 222(5), 753-779. https://doi.org/10.1006/JSVI.1998.2085

Niu, X. F., Chen, H. J., Li, Y., Jia, X. Y., Zhang, Y. W., & Yong, X. (2022). Design and performance of a small-scale acoustic wind tunnel at Wenzhou University for aerodynamic noise studies. Applied Acoustics, 199, 109010. https://doi.org/10.1016/j.apacoust.2022.109010.

Scharpf, D. F., & Mueller, T. J. (1992). Experimental study of a low Reynolds number tandem airfoil configuration, Journal of Aircraft, 29(2), 231-236. https://doi.org/10.2514/3.46149.

Selerowicz, W., Sobieraj, G., & Szumowski, A. (1998). Effect of miss-distance on the airfoil-vortex interaction. Experiment. Archives of Mechanics, 50(4), 691-701. https://doi.org/10.1109/IDAACS.2005.282979

Vemuri, S., Liu, X., Zang, B., & Azapeyvand, M. (2017). On the application of trailing-edge serrations for noise control from tandem airfoil configuration. AIAA paper, 3716. https://doi.org/10.2514/6.2017-3716

Vemuri, S., Liu, X., Zang, B., & Azapeyvand, M. (2020). On the use of leading-edge serrations for noise control in a tandem airfoil configuration. Physics of Fluids, 32, 077102. https://doi.org/10.1063/5.0012958

Winkler, J., Carolus, T., Scheuerlein, J., Dinkelacker, F. (2010). Trailing-edge blowing on tandem airfoils: Aerodynamic and Aeroacoustic Implications. 16th AIAA/CEAS Aeroacoustics Conference, 3981. https://doi.org/10.2514/6.2010-3981

Yakhina, G., Roger, M., Moreau, S., et al. (2020). Experimental and analytical investigation of the tonal trailing-edge noise radiated by low Reynolds number aerofoils. Acoustics. MDPI. https://doi.org/10.3390/acoustics2020018.

Yang, Y., Pröbsting, S., Liu, Y., Zhzng, H., & Li, Y. (2021). Effect of dual vortex shedding on airfoil tonal noise generation. Physics of Fluids, 33(7), 075102. https://doi.org/10.1063/5.0050002.