Effects of reaction reversibility on ignition and flame propagation

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• 作者：Cong Li (1) (3)
  Yunchao Wu (1) (3)
  Zheng Chen (1) (2)
  
• 关键词：Ignition ; Spherical flame propagation ; Reversible reaction ; Markstein length ; Lewis number
• 刊名：Journal of Mathematical Chemistry
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：53
• 期：1
• 页码：386-401
• 全文大小：572 KB
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• 作者单位：Cong Li (1) (3)
  Yunchao Wu (1) (3)
  Zheng Chen (1) (2)
  
  1. State Key Laboratory for Turbulence and Complex Systems (SKLTCS), Department of Mechanics and Engineering Science, College of Engineering, Peking University, Room 408, Beijing, 100871, China
  3. Department of Mechanical Engineering, University of Connecticut, Storrs, CT, USA
  2. Department of Aeronautics and Astronautics, College of Engineering, Peking University, Beijing, 100871, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Physical Chemistry
  Theoretical and Computational Chemistry
  Mathematical Applications in Chemistry
  
• 出版者：Springer Netherlands
• ISSN：1572-8897

文摘

Chemical reactions in high-temperature combustion are reversible and reaction reversibility might have a great impact on fundamental combustion processes such as ignition and flame propagation. In this study, ignition and propagation of spherical flames with a reversible reaction are analyzed using the large-activation-energy asymptotic method. Analytical correlations are derived to describe the change of spherical flame propagation speed and flame temperature with flame radius. The reversibility parameter, fuel Lewis number, and ignition power are included in these correlations. These correlations can predict different flame regimes and transitions among the ignition kernel, flame ball, propagating spherical flame, and planar flame. Therefore, based on these correlations spherical flame propagation and initiation are then investigated with the emphasis on assessing the impact of reaction reversibility. It is found that similar to heat loss, reaction reversibility can greatly affect spherical flame propagation speed, Markstein length, flame ball radius, minimum ignition power, and critical ignition radius. Moreover, it is demonstrated that the influence of reaction reversibility depends on fuel Lewis number.