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

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
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
Link: https://doi.org/10.5594/J08903
Author(s): Marie Merle, J. P. Fragassi

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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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<li>
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>
</li>