Abstract
Making clear the generation mechanism of fluid dynamic noise is essential to reduce noise deriving from turbomachinery. The analysis of the aerodynamic noise generated from circular cylinder is carried out numerically and experimentally in a low noise wind tunnel. In this study, aerodynamic sound radiated from a circular cylinder in uniform flow is predicted numerically by the following two step method. First, the three-dimensional unsteady incompressible Navier-Stokes equation is solved using the high order accurate upwind scheme. Next, the sound pressure level at the observed point is calculated from the fluctuating surface pressure on the cylinder, based on modified Lighthill-Curl’s equation. It is worth to note that the noise generated from the model is reduced rapidly when it is inclined against the mean flow. In other words, the peak level of the radiated noise decreases rapidly with inclination of the circular cylinder. The simulated SPL for the inclined circular cylinder is compared with the measured value, and good agreement is obtained for the peak spectrum frequency of the sound pressure level and tendency of noise reduction. So we expect that the change of flow structures makes reduction of the aerodynamic noise from the inclined models.
Similar content being viewed by others
References
Fujita, H. et al., “Experimental Study on Aerodynamic Noise Generated from Two-Dimensional Models (1st Report, Study on Wind Tunnel Wall Effect and Wall Materials)”, Trans. JSME, 62-593, B, pp.187–193, (1996).
Ishii, K. et al., “Numerical Study on Acoustic Emission from Flow Past an Airfoil”, Journal of the Physical Society of Japan, 66, No.7, pp.1995–2001, (1997).
Kawamura, T., Kuwahara, K., “Computation of High Reynolds Number Flow around a Circular Cylinder with Surface Roughness”, AIAA paper, 84-0340, (1984).
Kawamura, T., Hayashi, T., “Computation of Flow around a Yawed Circular Cylinder”, JSME International Journal, Series B, 37, No2, pp.229–236, (1994).
Curle, N., “The influence of solid boundaries upon aerodynamic sound”, Proc. Roy. Soc., A, 231, pp.505–514, (1955).
Iida, A. et al., “Experimental Investigation of Generation Mechanism of Aerodynamic Noise (1st Report, On a Coherent Structure of Surface Pressure Fluctuation on a Circular Cylinder)”, Trans. JSME, 61-592, B, pp.4371–4378, (1995).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Haramoto, Y., Yasuda, S., Matsuzaki, K. et al. Analysis of aerodynamic noise generated from inclined circular cylinder. J. of Therm. Sci. 9, 122–128 (2000). https://doi.org/10.1007/s11630-000-0005-2
Issue Date:
DOI: https://doi.org/10.1007/s11630-000-0005-2