High-Speed Flash Photography of Jets and Study of Noises of Aerodynamic Origin

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPTE
Volume: 80, No. 4, pp. 282–285
Abstract: In the study of noises coming from gaseous supercritical jets the waves were investigated by four separate methods in order to cross check the results. With the use of an electronic camera a film was made showing the evolution of acoustic waves. A sound analysis was made using a narrow passband analyzer and a microphone sensitive to high frequency. Schlieren photographs show that the waves on one side are out of phase relatively to those on the other side. Convergent-divergent nozzles were used giving Mach numbers from 1 to 4 comparable to sonic nozzles. The jet has a cellular structure at the exit as shown on shadowgraph pictures. “Screeches” occur when the jet is overexpanded. A specific ratio of pressure exists for each nozzle which brings about maximum screech. Frequency of oscillation was determined from 16 views filmed by the schlieren and shadowgraph methods. Two schlieren photographs demonstrate that a reflector at the origination of the jet diminishes jet screech by 20 dB.
Publication Date: 1971-04-01
DOI: 10.5594/J08903
ISSN: Print: 0361-4573
Link: https://doi.org/10.5594/J08903
Author(s): Marie MerleCentre de Recherches Physiques, 31, Chemin Joseph-Aiguier, Marseille (9), France
J. P. FragassiCentre de Recherches Physiques, 31, Chemin Joseph-Aiguier, Marseille (9), France
Copyright: © 1971 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

1. Merle M. , “Experimental study of gas outflow,” Publ. Sc. et Tech. du Ministère de l'Air , no. 308 ( 1956 ). EXTERNAL
2. Merle M. , “Acoustic emissions associated with supersonic air jets,” J. de Mécanique , Vol. 4 , No. 3 , Sept. 1965 . EXTERNAL
3. Fayole P. Naslin P. , “Instantaneous photography and high-speed cinematography,” Ed. de la Revue d'Optique Paris , 1950 . EXTERNAL
4. Lighthill M. J. , “On sound generated aerodynamically: I–General theory,” Proc. Roy. Soc., A. 211 , 564 – 587 , 1952 . EXTERNAL
5. Lighthill M. J. , “On sound generated aerodynamically: II–Turbulence as a source of sound,” Proc. Roy. Soc., A. 222 , 1 – 32 , 1952 . EXTERNAL
6. Lord Rayleigh J. W. S. , The Theory of Sound , Vol. II , Dover Publications , New York , 1945 . EXTERNAL
7. Ribner H. S. , “The sound generated by interaction of a single vortex with a shock wave,” UTIA Report No. 61 , June 1959 . EXTERNAL
8. Powell A. , “Mechanisms of aerodynamic sound production,” NATO-AGARD Report 446 , April 1963 . EXTERNAL
9. Westley R. Woolly J. H. , “An investigation of the near noise fields of a choked axisymmetric air jet,” NRC of Canada, Aero Rep. , L. R. 506 , June 1968 . EXTERNAL

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Marie Merle and J. P. Fragassi; High-Speed Flash Photography of Jets and Study of Noises of Aerodynamic Origin, Journal of the SMPTE ( Volume: 80, Issue: 4, April 1971); SMPTE, 1971. Available at https://doi.org/10.5594/J08903

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Marie Merle and J. P. Fragassi; High-Speed Flash Photography of Jets and Study of Noises of Aerodynamic Origin, Journal of the SMPTE ( Volume: 80, Issue: 4, April 1971); SMPTE, 1971. Available at https://doi.org/10.5594/J08903

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<span class="citation">Marie Merle and J. P. Fragassi; <cite>High-Speed Flash Photography of Jets and Study of Noises of Aerodynamic Origin</cite>, Journal of the SMPTE ( Volume: 80, Issue: 4, April 1971); SMPTE, 1971. Available at <a href="https://doi.org/10.5594/J08903" target="_blank" rel="noopener">https://doi.org/10.5594/J08903</a></span>

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Marie Merle and J. P. Fragassi; <cite id="bib-10-5594-j08903">High-Speed Flash Photography of Jets and Study of Noises of Aerodynamic Origin</cite>, Journal of the SMPTE ( Volume: 80, Issue: 4, April 1971); SMPTE, 1971
<span class="doi">10.5594/J08903</span>
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