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On flame-turbulence interaction in constant-pressure expanding flames

Chaudhuri, Swetaprovo and Saha, Abhishek and Law, Chung K (2015) On flame-turbulence interaction in constant-pressure expanding flames. In: PROCEEDINGS OF THE COMBUSTION INSTITUTE, 35 (2). pp. 1331-1339.

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Official URL: http://dx.doi.org/ 10.1016/j.proci.2014.07.038

Abstract

In this paper we present one of the first high-speed particle image velocimetry measurements to quantify flame-turbulence interaction in centrally-ignited constant-pressure premixed flames expanding in nearisotropic turbulence. Measurements of mean flow velocity and rms of fluctuating flow velocity are provided over a range of conditions both in the presence and absence of the flame. The distributions of stretch rate contributions from different terms such as tangential straining, normal straining and curvature are also provided. It is found that the normal straining displays non-Gaussian pdf tails whereas the tangential straining shows near Gaussian behavior. We have further tracked the motion of the edge points that reside and co-move with the edge of the flame kernel during its evolution in time, and found that within the measurement conditions, on average the persistence time scales of stretch due to pure curvature exceed that due to tangential straining by at least a factor of two. (C) 2014 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

Item Type: Journal Article
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Additional Information: Copy right for this article belongs to the ELSEVIER SCIENCE INC, 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
Keywords: Turbulent premixed flame; Stretch rate; High-speed PIV
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering (Formerly, Aeronautical Engineering)
Date Deposited: 04 Mar 2015 12:49
Last Modified: 04 Mar 2015 12:49
URI: http://eprints.iisc.ernet.in/id/eprint/50998

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