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Experimental study of role of instabilities in turbulent premixed combustion

DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf.980
12 pages

A. A. Burluka
School of Mechanical Engineering, The University of Leeds, Woodhouse Lane, Leeds LS2 9JT UK; and CORIA UMR 6614 CNRS, University of Rouen, Rouen, France

A. M. T. El-Dein Hussin
School of Mechanical Engineering, The University of Leeds, Woodhouse Lane, Leeds LS2 9JT UK

Ch. Mandilas
School of Mechanical Engineering, The University of Leeds, Woodhouse Lane, Leeds LS2 9JT UK

C.G.W. Sheppard
School of Mechanical Engineering, The University of Leeds, Woodhouse Lane, Leeds LS2 9JT UK

Abstract

Laminar and turbulent burning velocities were measured in a closed-volume fan-stirred vessel for H2 - CO mixtures using two independent methods of flame definition. It has been shown that the unsteady flame development is an important factor and it needs to be taken into account for comparison of the burning rates obtained in different experiments. For the atmospheric pressure flames, the mixtures with faster laminar flame velocities burnt faster in turbulent flow despite the fact that the lean flames exhibit cellular structures. However, even a modest increase of the initial pressure promotes strongly cellularity and causes a significant acceleration of a lean laminar flame. The same lean flame burns faster in turbulent flow as well and this increase in the rate of combustion is greater that can be deduced from variation of the molecular heat diffusivity and laminar flame speed, thus indicating the enhancement of the turbulent burning rate by an instability of a laminar flame.

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