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Standing waves in an open pipe: A nonlinear initial-boundary value problem

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Summary

Transient disturbances in a column of gas in an open tube are described using a nonlinear theory which includes both amplitude dispersion and wave interactions. For reflection from an open end, the theory must include the second nonlinear correction to the characteristic to distinguish the linear and nonlinear travel times. The initial value problem is reduced to solving a functional difference equation which determines the signal on a boundary. When the signal is damped by allowing radiation of energy at the boundaries, it may be possible to prevent shock formation.

Zusammenfassung

Zeitabhängige Störungen in einem mit Gas gefüllten offenen Rohr werden beschrieben mit Hilfe einer nicht-linearen Theorie, welche sowohl Amplituden-Dispersion wie auch gegenseitige Beeinflussung von Wellenzügen berücksichtigt. Für Reflektionen am offenen Ende muss die Theorie die nicht-linearen Korrekturen zweiter Ordnung zu den Charakteristiken berücksichtigen, um lineare und nicht-lineare Laufzeiten unterscheiden zu können. Die Anfangswertaufgabe wird auf die Lösung einer Funktional-Differenzen-Gleichung reduziert, welche das Signal am Rohrende bestimmt. Wenn das Signal gedämpft wird durch Zulassung von Abstrahlung am Rohrende, kann die Stossbildung vermieden werden.

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Mortell, M.P., Seymour, B.R. Standing waves in an open pipe: A nonlinear initial-boundary value problem. Journal of Applied Mathematics and Physics (ZAMP) 24, 473–487 (1973). https://doi.org/10.1007/BF01588151

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  • DOI: https://doi.org/10.1007/BF01588151

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