Abstract
The existence of a large scale structure of turbulence in a free hot jet is emphasized by measurements carried out on the initial assumption of a fine scale structure. Second order analysis allows one to split the signals picked up in the jet and in the acoustic field into coherent and non-coherent components. The validity of this decomposition with regard to the physical picture of the phenomenon, i.e. vortices convected in the mixing zone, is tested by means of conditional sampling analysis, applied for several diagnostics.
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References
Amphoux de Belleval, J.F. — Relation du champ acoustique d'un jet chaud avec sa turbulence et son émission infrarouge. Publ. ONERA, n° 159 (1974), English translation ESA TT248 (1976).
Dahan, C. — Emission acoustique de structures cohérentes dans un jet turbulent. Publ. ONERA, 1976-4.
Avezard et al. — Simultaneous characterization of jet noise sources and acoustic field by a new application of conditional sampling. AIAA paper no. 77–1349 (1977).
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© 1978 Springer Verlag
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Dahan, C., Elias, G., Maulard, J., Perulli, M. (1978). Coherent structures in the mixing zone of a subsonic hot free jet. In: Fiedler, H. (eds) Structure and Mechanisms of Turbulence II. Lecture Notes in Physics, vol 76. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0012621
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DOI: https://doi.org/10.1007/BFb0012621
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