Abstract
This paper presents an experimental study on the aeroacoustic characteristics of a NACA 0018 with nonflat plate-type serrated trailing edge at Reynolds numbers of 500000 in an open-jet wind tunnel. The experimental results show that noise reduction can be achieved in the moderate frequency range for nonflat plate type triangular serrated trailing edges, but at the cost of producing narrowband tone noise. The level of the vortex shedding noise declines when serration length 2 h decreases. It is imperative that the vortex shedding tone noise be completely suppressed when a novel slanting root serrated trailing edge is adopted. Meanwhile, the ability of broadband noise reduction is maintained.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (51106099, 11502146), the Opening Foundation of Key Laboratory of Aerodynamic Noise Control (ANCL20180102) and the Open Project of Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering.
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Recommended by Associate Editor Cheolung Cheng
Eryun Chen received Ph.D. degree in Nanjing University of Science and Technology, Nanjing, China, in 2009. Now he works at University of Shanghai for Science and Technology. His current research interests include computation fluid dynamics and flow-induced vibration and noise.
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Chen, E., Ma, Y., Yang, A. et al. Experimental investigation on noise emissions of an airfoil with non-flat plate trailing edge serrations. J Mech Sci Technol 33, 3069–3074 (2019). https://doi.org/10.1007/s12206-019-0601-x
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DOI: https://doi.org/10.1007/s12206-019-0601-x