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Lewis number effect on the propagation of premixed laminar flames in narrow open ducts

机译:Lewis数对狭窄的开放管道中预混层流火焰传播的影响

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摘要

The propagation of premixed laminar flames with different Lewis numbers in open ducts of circular cross-section is investigated numerically in a thermal-diffusive model. Ducts with adiabatic and cold isothermal walls are considered. the existence of multiple solutions in the case of isothermal wall is demonstrated and a quenching radius is determined. when the Lewis number is less than unity the flame velocities in ducts with an isothermal wall may exceed those in ducts with an adiabatic wall of the same diameter, because of the appearance of cellular structures, which increase the curvature effect triggered by the boundary conditions at the wall.
机译:在热扩散模型中,数值研究了具有不同路易斯数的预混合层流在圆形横截面的开放管道中的传播。考虑具有绝热和冷等温壁的管道。证明了等温壁情况下多个解的存在,并确定了淬火半径。当刘易斯数小于1时,由于孔结构的出现,等温壁的管道中的火焰速度可能会超过绝热壁的管道中的火焰速度,这是因为蜂窝结构的出现会增加边界条件触发的曲率效应。墙。

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