Generation and characteristics of internal fire whirl in a shaft model with two corner slits under microgravity conditions

Y. Huo, Wan Ki Chow, C. L. Chow

Research output: Journal article publicationJournal articleAcademic researchpeer-review


The shaft model has two diagonally opposite corner slits with an open roof and a 10-cm diameter heptane pool fire inside. Acceleration due to gravity is varied from normal value of g to 0.0125g. Numerical simulation indicates that even under low gravity of 0.0125g, circular air motion would still bring fuel to a high level to give a larger flame height in the shaft model, compared with that in free space under the same gravity environment, the ratio in flame height being about 1.5 except at very low gravity value. For IFW generated in the shaft model, the heat release rate, the maximum tangential velocity and the maximum axial velocity decrease slowly as gravity decreases when gravity is above 0.1g. Below 0.1g, these quantities decrease rapidly as gravity decreases. Reduction in gravity also changes the flame shape of IFW.
Original languageEnglish
Pages (from-to)3058-3069
Number of pages12
JournalAdvances in Space Research
Issue number12
Publication statusPublished - 15 Jun 2017


  • Internal fire whirl
  • Microgravity environment
  • Shaft model
  • Simulation

ASJC Scopus subject areas

  • Aerospace Engineering
  • Space and Planetary Science

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