Numerical Study of the Effect of Taylor Dispersion on Flames in Semi-Open Narrow Channels
Effects of Taylor dispersion on the propagation of a premixed flame ignited at a closed end of a semi-open narrow channel are investigated within a range of Peclet numbers(representing a non-dimensional channel diameter),thermal expansion coefficients,Lewis numbers,and Zel'dovich numbers.The unconventional nonmonotonic dependence of burning rate on channel diameter is identified and attributed to the competition between Taylor dispersion mechanism and flame elon-gation effects.Furthermore,a domain,in terms of Peclet number and thermal expansion coefficient,in which the flame speed is significantly influenced by Taylor dispersion,is established.The influ-ences of Lewis number and Zel'dovich number on the burning rate and structure of reaction zone are found to be negligible in narrow channels due to thickened and undistorted flame caused by Taylor dispersion mechanism.
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