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Numerical simulation of laminar premixed hydrogen-air flame/shock interaction in semi-closed channel
Proceedings of the Combustion Institute ( IF 3.4 ) Pub Date : 2022-12-05 , DOI: 10.1016/j.proci.2022.11.002
Emilie Yhuel , Guillaume Ribert , Pascale Domingo

Highly refined simulations of flame/shock interactions (FSI) are performed and analyzed in the context of hydrogen/air combustion in a two-dimensional shock-tube configuration (height 7 cm). The chemical mechanism used for the hydrogen oxidation contains 9 reactive species, without nitrogen oxides, and 23 kinetic reactions. An initially planar laminar premixed flame (ϕ = 0.8, P=20 kPa) is left to evolve until the ratio between its burning flame velocity and the laminar flame speed reaches 1.45. Two thermal wall boundary conditions are envisaged: isothermal with Twall fixed to 300 K and adiabatic. The species transport is described with a unity Lewis number for all species or by complex transport. Once the flame is established, a shock is installed in the domain which propagates toward the flame. Two values of the Mach number for the incident shock are considered: Ms=1.4 and Ms=1.9. The relative impacts of the wall thermal condition, of the species transport modeling and of the incident shock Mach number on the FSI process are discussed. It is observed that thermal boundary conditions and transport modeling have a weak impact during the first stages of the FSI, i.e. the two successive interactions of the incoming and reflected shock with the flame, but a significant one once the reflected shock has crossed the flame front.



中文翻译:

半封闭通道内层流预混氢-空气火焰/冲击相互作用的数值模拟

在氢气/空气燃烧的二维激波管配置(高度 7 厘米)的背景下,对火焰/激波相互作用 (FSI) 进行了高度精确的模拟并进行了分析。用于氢氧化的化学机理包含 9 种活性物质,不含氮氧化物,以及 23 种动力学反应。初始平面层流预混火焰(φ= 0.8,P=20 kPa)任其发展直至其燃烧火焰速度与层流火焰速度之比达到1.45。设想了两个热壁边界条件:等温wA固定为 300 K 且绝热。物种运输用所有物种的统一路易斯数或复杂的运输来描述。火焰一旦建立,就会在域中安装冲击波,该冲击波会向火焰传播。考虑事件冲击的马赫数的两个值:=1.4=1.9. 讨论了壁面热条件、物质输运模型和入射激波马赫数对 FSI 过程的相对影响。据观察,热边界条件和传输建模在 FSI 的第一阶段具有微弱的影响,即传入冲击波和反射冲击波与火焰的两个连续相互作用,但一旦反射冲击波穿过火焰前缘,影响就很大.

更新日期:2022-12-05
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