Phenomenological model of chain-branching premixed flames

Abstract

In this work, we introduce a global kinetic model that includes fuel, oxygen, products and two radical species involved in the reversible chain-branching, chain-propagation and chain-termination reactions. The model naturally extends the Zeldovich–Liñán and Zeldovich–Barenblatt–Dold models and can be used to describe both premixed and diffusion flames. Here it is applied to the problem of the deflagration wave propagation in the hydrocarbon fuel/air mixture with arbitrary equivalence ratio under the simplifying thermal-diffusive approximation. The conservation equations are solved numerically in order to obtain the velocity and structure of the combustion wave. It is demonstrated that the peak values of the adiabatic flame temperature and deflagration velocity are shifted towards the rich mixture composition if the reverse reactions of product decomposition are taken into account. The dependence of the flame speed and temperature on parameters of the system is analysed. The prospects of further investigation are discussed.

Keywords:

• combustion waves
• chain-branching
• global kinetics
• Zeldovich–Liñán model
• thermal-diffusive approximation

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The study was supported financially by the Ministry of Education and Science of Russian Federation (project RFMEFI58417X0031).