Effects of dilution on blowout limits of turbulent jet flames

Yei Chin Chao, Chih Yung Wu, Kuo Yuan Lee, Yueh Heng Li, Ruey Hung Chen, Tsarng Sheng Cheng

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

An extended database on blowout velocities of inert-diluted methane, propane, and hydrogen jet flames in the turbulent regime was experimentally established and used to examine and verify existing theories of blowout velocity estimation. Helium, argon, nitrogen, and carbon dioxide were used as the inert diluents to generate different initial properties at the jet exit. The theories of blowout velocity estimation by Kalghatgi (Combust. Sci. Technol., vol. 26, pp. 233-239, 1981) and Broadwell et al. (Proc. Combust. Instit., vol. 20, pp. 303-310, 1984) in the highly diluted regime were carefully examined using jet flames of different fuels diluted with inerts of different gas properties. The results showed that among the theories the blowout velocity estimation of Kalghatgi is more reliable in the extended region. On the other hand, the blowout velocity estimation of Broadwell et al. can do as well after proper modification by including the Reynolds number effect Ref. Based on the experimental results, modifications to the theories are proposed to accommodate for the deviation when they are used in the diluted regime. In addition, different from laminar jet flames, diffusive properties in terms of mass and thermal diffusivities are not the dominant parameters of blowout velocity in turbulent jet flames.

Original languageEnglish
Pages (from-to)1735-1753
Number of pages19
JournalCombustion science and technology
Volume176
Issue number10
DOIs
Publication statusPublished - 2004 Oct 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Physics and Astronomy(all)

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