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research-article

A numerical simulation to the influence of unsteady strain flow on twin premixed flames

[+] Author and Article Information
Faisal Al-Malki

Department of Mathematics and Statistics, Taif University, Saudi Arabia
falmalki@tu.edu.sa

1Corresponding author.

ASME doi:10.1115/1.4041794 History: Received September 12, 2018; Revised October 12, 2018

Abstract

The aim of this paper is to examine the response of twin premixed flames formed in a counterflow configuration to the presence of an unsteady straining flow. We began by describing the problem mathematically using the thermo- diffusive model with constant density and then adopted a finite elements approach to solve the problem numerically. The study has shown that the role of flow on flame propagation is determined by three main parameters, namely: flow amplitude A, strain rate ? and fuel Lewis number Le F . For Le F = 1, the flow is seen to promote flame extinction, while Le F < 1 the flow clearly enhances the flame reactivity. Qualitatively, it has been shown that for Le F = 1, there exists a critical value of A (that varies with ?) below which the reactivity decreases monotonically with A. For small Le F < 1, on the other hand, the re- activity were seen to increase with A. For Le F > 1, however, a non-monotonic dependence, especially for small ?, is predicted

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