Summary
Coherent structures are of importance for mixing and reaction in jet diffusion flames. Using a Toepler-schlieren set up with a nano-light as the light-source, a double vortex structure, a high frequency oscillation and a low frequency oscillation separated by the reaction front, is observed. At higher Reynolds numbers the vortices break down to threedimensional turbulence retaining some degree of coherence. Compared with constant density jets exhibiting one vortex system only, jet flames are more stable and the vortices are by far more dominant. The effect of combustion on hydrodynamic instability is discussed by the aid of the inviscid disturbance differential equation.
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References
Grant, A.J.; Jones, J.M.: Low frequency diffusion flame oscillations. Combustion and Flame 25, (1975) 153–160
Durão, D.F.G.; Whitelaw, J.H.: Instantaneous velocity and temperature measurements in oscillating diffusion flames. Proc. R. Soc. Lond. A. 338 (1974) 479–501
Kimura, I.: Stability of laminar-jet flames. Tenth Symposium (International) on Combustion (1965) 1295–1300
Yule, A.I.; Chigier, N.A.; Ralph, S.; Boulderstone, R.; Ventura, J.: Combustion-transition interaction in a jet flame. AIAA Paper 80–0077. 18th Aerospace Science Meeting, Pasadena, Cal. (1980)
Chigier, N.A.; Yule, A.J.: The physical structure of turbulent flames, A.I.A.A. paper 79–0217, 17th Aerospace Science Meetings New Orleans (1979)
Roshko, A.: Structure of turbulent shear flow: a new look. A.I.A.A. paper 76–78. A.I.A.A. 14th Aerospace Science Meeting, Washington D.C. (1976)
Michalke, A.: Der Einfluß variabler Dichte auf die Instabilität einer freien Scherschicht. Ingenieur-Archiv 40 (1971) 29–39
Michalke, A.; Schade, H.: Zur Stabilität von freien Grenzschichten. Ingenieur-Archiv 33. Bd, 1. Heft, (1963) 1–23
Howard, L.N.: The number of unstable modes in hydrodynamic stability problems. J. Méchanique 3 (1964) 433
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© 1982 Springer-Verlag Berlin Heidelberg
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Eickhoff, H. (1982). Instability and Coherent Structures in Jet Flames. In: Haase, W. (eds) Recent Contributions to Fluid Mechanics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-81932-2_6
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DOI: https://doi.org/10.1007/978-3-642-81932-2_6
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-81934-6
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