Calculation of the structure and extinction limit of a methane-air counterflow diffusion flame in the forward stagnation region of a porous cylinder

Some Unresolved Fire Chemistry Problems

“…Unfortunately, however, this model is in disagreement with predictions of complex numerical models by Miller and others (14,15) which take into account the kinetics of more than 100 individual reaction steps as well as transport properties. These various models are tested by comparing with measured concentration profiles within a diffusion flame; they all predict that ultimately the CO is consumed.…”

“…Furthermore, CF 4 is much less effective than CF 3Br, suggesting that removal of H atoms by HF formation is not too important.) The next step in more sophisticated understanding of extinguishment by bromine compounds might be to extend a computer-modeling approach, which DixonLewis et al (15) have applied to the strain-rate-induced extinction of a counterflow diffusion flame in the forward stagnation region of a porous cylinder, by including HBr in the kinetics. Further progress could also be made by quantifying the radiative heat loss stimulated by halogen addition to a hydrocarbon flame.…”

Modeling and calculation of turbulent lifted diffusion flames

“…5 and 11 or the strain rate s. The quenching value tlq is determined from laminar diffusion flamelet calculations [13][14][15] or from experiments [10]. The form of the pdfs P(12) are a lognormal distribution for the scalar dissipation [5] and a quasi Gaussian pdf for the strain rate [16].…”

Computational and experimental study of ammonium perchlorate/ethylene counterflow diffusion flames

“…While counterflow diffusion flames have been studied in recent years using experimental, theoretical, and numerical techniques [4][5][6][7][8][9][10], there has been little work in which these tools have been applied to the study of solid propellants in this configuration. While some preliminary studies of AP counterflow flames were made by Friedman [11], Ablow and Wise [12], Inami and Wise [13], Wiersma and Wise [14], and Mitani and Niioka [15], the first work that combined a detailed transport/finite-rate chemistry model of AP counterflow diffusion flames with experimental measurements was by Tanoff et al [16].…”