On transient behavior of non-premixed counter-flow diffusion flames within the REDIM based model reduction concept

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• 作者：V. Bykov ; ^{Viatcheslav.Bykov@kit.edu} ; A. Neagos ; U. Maas
• 关键词：Reaction&ndash ; diffusion system ; ILDM ; REDIM ; Model reduction ; Non-premixed laminar flames
• 刊名：Proceedings of the Combustion Institute
• 出版年：2013
• 出版时间：2013
• 年：2013
• 卷：34
• 期：1
• 页码：197-203
• 全文大小：648 K

文摘

In the present work non-stationary behavior of the counter-flow diffusion flame is examined in the context of the recently developed approach of model reduction called REaction-DIffusion Manifolds (REDIM) method. It is a natural extension of the ILDM approach which takes into account both the chemical reaction and the diffusion processes. It has been developed to treat both premixed and non-premixed regimes of combustion. In this work we investigate the ability of the concept to describe transient processes of extinction and re-ignition. A very simple flame configuration and transport model are considered in this current study for the sake of transparency because the main focus is on the transient and non-stationary behavior of flames. H₂/O₂/N₂ combustion system is considered in a non-premixed counter-flow diffusion 1D flame configuration. This study shows how the REDIM concept performs in the transient regimes; it interprets the effect of local extinction and reigniting phenomena using detailed and reduced models. It shows how the unstable/transient behavior of a detailed system can be successfully accounted with the help of the REDIM based reduced model.