Wall Pressure Fluctuations in Naturally Developing Boundary Layer Flows on Axisymmetric Bodies

Authors: Chinsuk Hong

Abstract:

This paper investigates the characteristics of wall pressure fluctuations in naturally developing boundary layer flows on axisymmetric bodies experimentally. The axisymmetric body has a modified ellipsoidal blunt nose. Flush-mounted microphones are used to measure the wall pressure fluctuations in the boundary layer flow over the body. The measurements are performed in a low noise wind tunnel. It is found that the correlation between the flow regime and the characteristics of the pressure fluctuations is distinct. The process from small fluctuation in laminar flow to large fluctuation in turbulent flow is investigated. Tollmien-Schlichting wave (T-S wave) is found to generate and develop in transition. Because of the T-S wave, the wall pressure fluctuations in the transition region are higher than those in the turbulent boundary layer.

Keywords: Wall Pressure Fluctuation, Boundary Layer Flow, Transition, Turbulent Flow, Axisymmetric Body, Flow Noise.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1110756

References:

[1] R. A. Katz, T. A. Galib, J. M. Cembrola, Classical and nonlinear analysis of transitional and turbulent boundary layer flow, in: Proceeding of 2nd Int. Symp. on Perf Enhancement for Marine App., 1990, pp. 119–127.
[2] J. C. Perraud, Studies of laminar-turbulent in air and water wall pressure fluctuations and acoustic emission from the turbulent intermittency, NCA 5 (1989) 17–24.
[3] H. D. Abarbanel, R. A. Katz, T. W. Frison, Nonlinear analysis of high-reynolds-number over a buoyantaxisymmetric body, Physics Review 49 (5) (1994) 4003–4018.
[4] W. W. Willmarth, Wall pressure fluctuations in a turbulent boundary layer, Journal of Acoustical Society of America 28 (1956) 1048–1053.
[5] W. K. Blake, Mechanics of flow-induced sound and vibration(I), Academic Press, Inc., 1986.
[6] W. K. Blake, Mechanics of flow-induced sound and vibration(II), Academic Press, Inc, 1986.
[7] G. C. Lauchle, Hydroacoustics of transitional boundary layer flow, ASME Applied Mechanics Review 44 (12) (1991) 517–531.
[8] M. Gal-el Hak, Unsteay separation on lifting surfaces, Applied Mechanics Review 40 (1987) 441.
[9] V. H. Arakeri, A note on the transition observations on an axisymmetrc body and some related fluctuating wall pressure measurement, Trans. ASME Journal of Fluids Engineering 97 (1975) 82.
[10] J. S. Kim, Measurement of flow noise on an axisymmetric body using a low noise wind tunnel, Tech. rep., Agency for Defense Development (1998).
[11] R. M. Lueptow, Wall pressure transducer spatial resolution, NCA 15/FEDVol 168 (1993) 49–55.
[12] W. K. Blake, Turbulent boundary-layer wall-pressure fluctuations on smooth and rough walls, Journal of Fluid Mechanics 44 (1970) 637–660.
[13] C. R. Nisewanger, F. B. Sperling, Flow noise inside boundary layers of buoyancy-propelled test vehicles, Tech. Rep. 8519, NAVWEPS (1965).
[14] W. K. Georage, P. D. Beuther, R. G. Arndt, Pressure spectra in turbulent free shear flows, Journal of Fluid Mechanics 148 (1984) 155–191.
[15] M. K. Bull, S. W. Thomas, High frequency wall pressure fluctuations in turbulent boundary layers, Physics of Fluids 19 (4) (1976) 597–599.
[16] J. S. Bendat, A. G. Piersol, Engineering Applications of Correlation and Spectral Analysis, Jon Wiley & Sons, Inc., 1993.