A Study Of Rich Methane Flames By Molecular Beam Inlet Mass Spectrometry

Author : Mary N. Sandia National Labs Bui-Pham (Combustion Research Facility)
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (479 download)

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Download or read book Rich Methane/air Flames written by Mary N. Sandia National Labs Bui-Pham (Combustion Research Facility) and published by . This book was released on 1994 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: A theoretical investigation has been conducted to establish a reliable chemical kinetic mechanism that can determine the extinction limit of opposed-flow, strained, rich premixed methane-air flames. In the process of developing this kinetic representation for rich methane-air flames, we found that the heat of formation of [sup 1]CH[sub 2]=102.5 kcal/mole, which is 1 kcal/mole higher than the currently available thermochemical data, gives the best agreement with experimental data on burning velocities for equivalence ratios between 0.5 and 1.7. Employing this value for [Delta]H[sub f[sup 1]CH[sub 2]] in our calculations, the extinction stretch rate, K[sub ex], was found to be K[sub ex]=2250 sec [sup [minus]1] for [phi]=1.0, K[sub ex]=2000 sec[sup [minus]1] for [phi]=1.1, and K[sub ex]=1400 sec[sup [minus]1] for [phi]=1.2. These results agree better with experiments than those using a lower heat of formation of singlet methylene. In comparison with previous calculations made by Kee et al., our predictions are basically the same except that our extinction stretch rate is slightly higher at [phi]=1.0 and that our location of the maximum extinction stretch rate is closer to that found in experiments. In addition, we establish the rich flammability limit using two different criteria to be approximately between [phi]=1.61 and [phi]=1.68, which agrees very well with an experimental value of [phi]=1.67.