Wall Pressure Fluctuations in Naturally Developing Boundary Layer Flows on Axisymmetric Bodies
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.
[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.
[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.
@article{"International Journal of Mechanical, Industrial and Aerospace Sciences:71748", author = "Chinsuk Hong", title = "Wall Pressure Fluctuations in Naturally Developing Boundary Layer Flows on Axisymmetric Bodies", 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.", volume = "10", number = "1", pages = "10-6", }