Double flame and multiple solution computations for a wetted porous sphere vaporizing in reactive flows

T. L. Jiang, W. S. Chen, M. J. Tsai, H. H. Chiu

研究成果: Article同行評審

11 引文 斯高帕斯(Scopus)

摘要

The flame and vaporization characteristics of an n-octane droplet burning in reactive flows are investigated through numerical analyses of a convective, reactive flow over a wetted porous sphere under various flow temperatures, Reynolds numbers, and ambient equivalence ratios. The liquid fuel is assumed to come through the porous sphere and vaporize at the sphere's surface. The gas flow field is predicted by solving the quasi-steady conservation equations of mass, momentum, and energy, in which gas-phase combustion is modeled by a one-step global finite-rate chemical reaction. Numerical results reveal that multiple solutions for flame configurations and vaporization rates exist under certain flow conditions for both r., rely oxidizing and reactive flows. Reactive flows increase the vaporization rate slightly at low ambient temperatures, while significantly at high ambient temperatures. Double flames occur in both the upper and lower branch solutions. In the upper branch situation, both the premixed and nonpremixed flames merge at relatively low ambient temperatures, low ambient equivalence ratios, or high Reynolds numbers. In the lower branch solution, however, double flames do not exist at sufficiently low ambient temperatures or high Reynolds numbers where the envelope flame does not appear.

原文English
頁(從 - 到)115-143
頁數29
期刊Combustion science and technology
102
發行號1-6
DOIs
出版狀態Published - 1994 十二月 1

All Science Journal Classification (ASJC) codes

  • 化學 (全部)
  • 化學工程 (全部)
  • 燃料技術
  • 能源工程與電力技術
  • 物理與天文學 (全部)

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