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Resonant oscillations in open tubes with a mean flow

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Summary

The resonant response of a jet of gas to periodic pressure fluctuations near the inlet-cross-section of a tube is investigated. It is assumed that the cross-section of the jet just matches the inlet cross-section. It is found that the pressure disturbances within the tube can grow very large and also the acoustic power which is indicated from the outlet of the tube can be much larger than the power input owing to the forcing pressure oscillation.

Zusammenfassung

Die resonante Anregung eines Gasstrahls durch periodische Druckstörungen nahe des Eintrittsquerschnittes eines Rohres wird untersucht. Es wird angenommen, dass der Querschnitt des Strahls mit dem Eintrittsquerschnitt übereinstimmt. Man findet, dass die Druckstörungen innerhalb des Rohres sehr gross werden können und dass die vom Ende des Rohres abgestrahlte akustische Leistung viel grösser sein kann als die Leistung, die auf Grund der Druckstörungen beim Rohreintritt eingespiesen wird.

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References

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Authors and Affiliations

  1. Brown Boveri Research Center, Baden, Switzerland

    Jakob J. Keller

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  1. Jakob J. Keller
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Keller, J.J. Resonant oscillations in open tubes with a mean flow. Journal of Applied Mathematics and Physics (ZAMP) 29, 85–91 (1978). https://doi.org/10.1007/BF01797305

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  • DOI: https://doi.org/10.1007/BF01797305

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