Lean-limit extinction of propane/air mixtures in the stagnation-point flow

Chung K. Law, Satoru Ishizuka, Masahiko Mizomoto

Research output: Contribution to journalArticlepeer-review

67 Scopus citations

Abstract

The extinction limits of lean propane/air mixtures in the stagnation-point flow of a flat surface were mapped as functions of the surface temperature and the mixture concentration, velocity, and temperature. The maximum flame temperatures and the flame locations were also measured. The results show that the extinction limits are extremely insensitive to the nature of the surface, which can be heated to 1000°C. On the other hand preheating the gas mixture increases the flame temperature by an almost equal amount and therefore significantly extends the extinction limits. It is also found that at extinction the maximum flame temperatures and the flame locations, which when scaled with the velocity gradient, assume almost constant values independent of the other system variables investigated. The present results provide useful insights on the flame location relative to the boundary layer, the importance of flame stretch relative to downstream heat loss in causing extinction, and the viability of the concept of limit temperature.

Original languageEnglish (US)
Pages (from-to)1791-1798
Number of pages8
JournalSymposium (International) on Combustion
Volume18
Issue number1
DOIs
StatePublished - 1981
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Mechanical Engineering
  • Physical and Theoretical Chemistry
  • Fluid Flow and Transfer Processes

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