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.
关键词
泰勒弥散/厚火焰/数值模拟
Key words
Taylor dispersion/thick flame/numerical simulation
维普
万方数据