DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf
ISBN Print: 978-1-56700-262-1
ISSN: 2377-2816
Effects of radiation on the dynamic behavior of premixed flames
ABSTRACT
This paper treats two-dimensional unsteady calculations of reactive flow on the basis of the compressible Navier-Stokes equation to elucidate the effects of radiation on the dynamic behavior of premixed flames. The disturbance superimposed on premixed flames evolved owing to intrinsic instability, and then the cellular-flame front formed. The dynamic behavior of cellular flames appeared at low Lewis numbers, and it became stronger as the radiation-loss parameter increased. Owing to the dynamic behavior, the burning velocity of cellular flames changed drastically with time, which was due mainly to the combination and division of cells. At low Lewis numbers, the burning velocity of the cellular flame with radiative loss was somewhat small compared with the adiabatic cellular flame. This was due to the decrease of the burning velocity of a planar flame and to the increase of surface area of a cellular flame. In addition, the average burning velocity became larger monotonically as the computational-domain length increased.