Generation of adverse pressure gradient in the circumferential flashback of a premixed flame

Karimi, N. , McGrath, S., Brown, P., Weinkauff, J. and Dreizler, A. (2016) Generation of adverse pressure gradient in the circumferential flashback of a premixed flame. Flow, Turbulence and Combustion, 97(2), pp. 663-687. (doi: 10.1007/s10494-015-9695-0)

Abstract

Circumferential upstream propagation of a premixed flame in a region confined between two concentric tubes is considered. The cold flow in this configuration features rotational motion and the flame is modelled as an interface separating the burned and unburned gases. Through an analytical solution of the integral form of the governing equations, it is shown that the static pressure increases across the flame. Hence, the circumferential propagation of the flame is associated with the generation of an adverse pressure gradient. The theoretical prediction of the pressure increase is, further, supported by the experimental observations and discussed in the context of the theory of flame back pressure. The results extend the recent findings on the generation of adverse pressure gradient during the axial propagation of swirling flames, to the circumferential direction. It is argued that the demonstrated pressure gain across the flame can significantly facilitate flame flashback.

• Item Type: Articles
• Additional Information: The authors are grateful for the financial support by Deutsche Forschungsgemeinschaft through project KA 3483/1-1.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Karimi, Dr Nader
• Authors: Karimi, N., McGrath, S., Brown, P., Weinkauff, J., and Dreizler, A.
• College/School: College of Science and Engineering > School of Engineering > Systems Power and Energy
• Journal Name: Flow, Turbulence and Combustion
• Publisher: Springer Verlag
• ISSN: 1386-6184
• ISSN (Online): 1573-1987
• Published Online: 06 January 2016
• First Published: First published in Flow, Turbulence and Combustion 97(2): 663-687
• Publisher Policy: Reproduced under a Creative Commons License