On the accurate determination of flame speeds at normal and elevated pressures by using a spherical bomb: The effects of compression and stretch

Zheng Chen, Yiguang Ju

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


The effects of compression wave and flame stretch on the determination of flame speeds using spherical bombs under constant pressure and constant volume conditions are studied theoretically and numerically. A time accurate and front adaptive numerical algorithm is developed to simulate the outwardly propagating spherical flame in a closed chamber in a broad range of pressures and equivalence ratios. The results show that both compression wave and flame stretch have significant impacts on the accuracy of measured flame speeds. For the constant pressure method, a new correlation to obtain compression corrected flame speed (CCFS) in nearly constant pressure spherical bomb experiments is presented. For the constant volume spherical bomb experiments, a method to obtain stretch corrected flame speed (SCFS) at elevated pressures and temperatures is also presented. The results show that the present methods can dramatically increase the reliability of the measured flame speeds and the pressure range of flame speed measurements in experiments.

Original languageAmerican English
Title of host publicationCollection of Technical Papers - 45th AIAA Aerospace Sciences Meeting
Number of pages9
StatePublished - 2007
Event45th AIAA Aerospace Sciences Meeting 2007 - Reno, NV, United States
Duration: Jan 8 2007Jan 11 2007

Publication series

NameCollection of Technical Papers - 45th AIAA Aerospace Sciences Meeting


Conference45th AIAA Aerospace Sciences Meeting 2007
Country/TerritoryUnited States
CityReno, NV

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering

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