Effects of buoyancy on premixed flame stabilization

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The stabilization limits of v-flame and conical flames are investigated in normal gravity (+g) and reversed gravity (up-side-down burner, -g) to compare with observations of flame stabilization during microgravity experiments. The results show that buoyancy has most influence on the stabilization of laminar V-flames. Under turbulent conditions, the effects are less significant. For conical flames stabilized with a ring, the stabilization domain of the +g and -g cases are not significantly different. Under reversed gravity, both laminar v-flames and conical flames show flame behaviors that were also found in microgravity. The v-flames reattached to the rim and the conical flame ... continued below

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15 p.

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Bedat, B. & Cheng, R.K. October 1, 1995.

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Description

The stabilization limits of v-flame and conical flames are investigated in normal gravity (+g) and reversed gravity (up-side-down burner, -g) to compare with observations of flame stabilization during microgravity experiments. The results show that buoyancy has most influence on the stabilization of laminar V-flames. Under turbulent conditions, the effects are less significant. For conical flames stabilized with a ring, the stabilization domain of the +g and -g cases are not significantly different. Under reversed gravity, both laminar v-flames and conical flames show flame behaviors that were also found in microgravity. The v-flames reattached to the rim and the conical flame assumed a top-hat shape. One of the special cases of -g conical flame is the buoyancy stabilized laminar flat flame that is detached from the burner. These flame implies a balance between the flow momentum and buoyant forces. The stretch rates of these flames are sufficiently low (< 20 s{sup -1}) such that the displacement speeds S{sub L} are almost equal to the laminar burning speed S{sub L}{sup 0}. An analysis based on evaluating the Richardson number is used to determine the relevant parameters that describe the buoyancy/momentum balance. A perfect balance i.e. Ri = l can be attained when the effect of heat loss from the flame zone is low. For the weaker lean cases, our assumption of adiabaticity tends to overestimate the real flame temperature. This interesting low stretch laminar flame configuration can be useful for fundamental studies of combustion chemistry.

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15 p.

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OSTI as DE96002552

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  • Fall meeting of the Western States Section of the Combustion Institute, Stanford, CA (United States), 30-31 Oct 1995

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  • Other: DE96002552
  • Report No.: LBL--37833
  • Report No.: CONF-9510145--3
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 135168
  • Archival Resource Key: ark:/67531/metadc625854

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • October 1, 1995

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • Aug. 8, 2016, 8:45 p.m.

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Bedat, B. & Cheng, R.K. Effects of buoyancy on premixed flame stabilization, article, October 1, 1995; California. (digital.library.unt.edu/ark:/67531/metadc625854/: accessed December 15, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.