Numerical calculation of the two-dimensional unsteady laminar flame propagation in a confined H2/Air system
✍ Scribed by Shinji Kojima
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- English
- Weight
- 840 KB
- Volume
- 63
- Category
- Article
- ISSN
- 0010-2180
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✦ Synopsis
To ascertain the feasibility of multidimensional flame propagation computations with detailed chemical kinetics, a two-dimensional unsteady laminar H2/air flame in a disk-shaped chamber was calculated numerically. The flame stretching technique originally developed by Butler et al. was applied in order to overcome the computational difficulty inherent in multidimensional laminar flame propagation problems. The technique was modified to introduce a cutoff value of the temperature gradient below which the stretching procedure is not applied. Also the inverse transformation was devised to unstretch the results. To obtain the quantitative accuracy and reliability of the calculation, a simple and efficient formulation of the transport coefficients was determined from the sensitivity studies. By these studies it was clarified that the flame propagation is sensitive to the collision integrals, but not sensitive to the deviation of the Lennard-Jones potential parameters, and the correction for the polarity of HzO molecule is unnecessary. Using the deduced formulation of the transport coefficients and the flame stretching procedure, the calculation results agree well with the experiment and the computation time is acceptable.