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Abstract
This paper reports an experimental investigation of the acoustic field in a duct due to vortex shedding from multiple restrictors. The spacing between two restrictors was varied very closely in these experiments. It was observed that high amplitude acoustic field was established in the duct when the restrictors were closely spaced and that the highest amplitude of acoustic oscillations occurred for a certain specific spacing of the restrictors depending upon other conditions. It was also observed that the dominant frequencies locked on to the different possible natural acoustic modes that could be established in the duct.
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References
- Flandro, G.A. and Jacobs, H.R., "Vortex-Generated Sound in Cavities", Progress in Astronautics and Aeronautics, Edited by H.T Nagamatsu, Academic Press, New York, Vol.37, 1975, pp.521-533.
- Culick, F.E.C. and Magiawala, K., "Excitation of Acoustic Modes in a Chamber by Vortex Shedding", Journal of Sound and Vibration, Vol.64, No.3, 1979, pp.455-457.
- Dunlap, R. and Brown, R.S., "Exploratory Experiments on Acoustic Oscillations Driven by Periodic Vortex Shedding", AIAA Journal, Vol.19, No.3, 1981, pp.408-409.
- Brown, R.S., Dunlop, R., Young, S.W. and Waugh, R.C., "Vortex Shedding as a Source of Acoustic Energy in Segmented Solid Rockets", Journal of Spacecraft, Vol.18, 1981, pp.312-319.
- Nomoto, H. and Culick, F.E.C., "An Experimental Investigation of Pure Tone Generation by Vortex Fig. 7 Schematic representation of the frequency shifts obtained in this study. Circles are representative of the experimental data points NOVEMBER 2005 ACOUSTIC FIELD IN A DUCT RESULTING FROM VORTEX SHEDDING 427 Shedding in a Duct", Journal of Sound and Vibration, Vol.84, No.2, 1982, pp.247-252.
- Petersen, E.L. and Murdock, J.W., "Control of Vortexinduced Oscillations in a Model Solid Rocket Motor: Flow Characterization and Secondary Injection Experiments", AIAA Paper No. 99-2506, 35th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, Los Angeles, California, June 1999.
- Stubos, A.K., Benecci, C., Palli, E., Stoubos, G.K. and Olivari, D., "Aerodynamically Generated Acoustic Resonance in a Pipe with Annular Flow Restrictors", Journal of Fluids and Structures, Vol.13, 1999, pp.755-778.
- Mettenleiter, M., Haile, E. and Candel, S., "Adaptive Control of Aeroacoustic Instabilities", Journal of Sound and Vibration, Vol.230, 2000, pp.761-789.
- Karthik, B., Venkateswarulu, N., Kowsik, B.V.R., Chakravarthy, S.R., Sujith, R.I. and Tulapurkara, E.G., "Vortex-Resonant Sound Interaction in a Duct Containing and Orifice", Journal of Aerospace Sciences and Technologies, Vol.56, No.4, 2004, pp.217-225.
- Venkateswarulu, N., Rayapudi, V., Kowsik., B.V.R., Chakravarthy, S.R. and Sujith, R.I., "Vortex Shedding in Segmented Solid Rocket Motors : Acoustic Mode Shifts", AIAA Paper No. 2000-3808, 36th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit", Huntsville, Alabama, July 2000.
References
Flandro, G.A. and Jacobs, H.R., "Vortex-Generated Sound in Cavities", Progress in Astronautics and Aeronautics, Edited by H.T Nagamatsu, Academic Press, New York, Vol.37, 1975, pp.521-533.
Culick, F.E.C. and Magiawala, K., "Excitation of Acoustic Modes in a Chamber by Vortex Shedding", Journal of Sound and Vibration, Vol.64, No.3, 1979, pp.455-457.
Dunlap, R. and Brown, R.S., "Exploratory Experiments on Acoustic Oscillations Driven by Periodic Vortex Shedding", AIAA Journal, Vol.19, No.3, 1981, pp.408-409.
Brown, R.S., Dunlop, R., Young, S.W. and Waugh, R.C., "Vortex Shedding as a Source of Acoustic Energy in Segmented Solid Rockets", Journal of Spacecraft, Vol.18, 1981, pp.312-319.
Nomoto, H. and Culick, F.E.C., "An Experimental Investigation of Pure Tone Generation by Vortex Fig. 7 Schematic representation of the frequency shifts obtained in this study. Circles are representative of the experimental data points NOVEMBER 2005 ACOUSTIC FIELD IN A DUCT RESULTING FROM VORTEX SHEDDING 427 Shedding in a Duct", Journal of Sound and Vibration, Vol.84, No.2, 1982, pp.247-252.
Petersen, E.L. and Murdock, J.W., "Control of Vortexinduced Oscillations in a Model Solid Rocket Motor: Flow Characterization and Secondary Injection Experiments", AIAA Paper No. 99-2506, 35th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, Los Angeles, California, June 1999.
Stubos, A.K., Benecci, C., Palli, E., Stoubos, G.K. and Olivari, D., "Aerodynamically Generated Acoustic Resonance in a Pipe with Annular Flow Restrictors", Journal of Fluids and Structures, Vol.13, 1999, pp.755-778.
Mettenleiter, M., Haile, E. and Candel, S., "Adaptive Control of Aeroacoustic Instabilities", Journal of Sound and Vibration, Vol.230, 2000, pp.761-789.
Karthik, B., Venkateswarulu, N., Kowsik, B.V.R., Chakravarthy, S.R., Sujith, R.I. and Tulapurkara, E.G., "Vortex-Resonant Sound Interaction in a Duct Containing and Orifice", Journal of Aerospace Sciences and Technologies, Vol.56, No.4, 2004, pp.217-225.
Venkateswarulu, N., Rayapudi, V., Kowsik., B.V.R., Chakravarthy, S.R. and Sujith, R.I., "Vortex Shedding in Segmented Solid Rocket Motors : Acoustic Mode Shifts", AIAA Paper No. 2000-3808, 36th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit", Huntsville, Alabama, July 2000.