- Author
- Hamins, A. | Yang, J. C. | Kashiwagi, T.
- Title
- Experimental Investigation of the Pulsation Frequency of Flames.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
- Book or Conf
- Combustion Institute, Symposium (International) on Combustion, 24th. July 5-10, 1992, Combustion Institute, Pittsburgh, PA, Sydney, Australia, 1695-1702 p., 1992
- Keywords
- combustion | flame spread | heat release rate | stability | flow visulation | flow visualization
- Identifiers
- fuel exit velocity; burner diameter; pulsation frequency
- Abstract
- Measurements of the pulsation frequency in non-premixed flames were conducted for gaseous and liquid fuels. Measurements were performed over a wide range of Froude number, Reynolds number and burner diameter. The fuel velocity at the burner exit has a weak influence on the pulsation frequency for some diamters. The Strouhal number plotted as a function of the inverse Froude number was shown to correlate the measurements determined here as well as measurements reported in the literature for pulsations in flames burning gaseous, liquid and solid fuels over 14 orders of magnitude in Froude number. Previous measurements of the effect of enhanced gravitational level on the pulsation frequency were also interpreted in terms of the Strouhal number--Froude number relationship. Stability limits in flames were investigated. The critical fuel velocity needed to initiate pulsations was measured as a function of burner diameter for methane and propane flames. Flow visualization was used to measure the pulsation frequency of an isothermal buoyant gas stream over a range of Froude number. A plot of the Strouhal number as a function of the inverse Froude number also correlated the measurements, but yielded a different power law exponent than the reacting flow case.