Freely propagating open premixed turbulent flames stabilized by swirl

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A novel means has been developed for using weak swirl to stabilize freely propagating open premixed turbulent flames (swirl numbers between 0.05 to 0.3). By injecting a small amount of air tangentially into the co-flow of a concentric burner, stationary flames can be maintained above the burner exit for a large range of mixture, turbulence and flow conditions. The absence of physical surfaces in the vicinity of the flame provides free access to laser diagnostics. Laser Doppler anemometry and laser Mie scattering measurements of four flames with and without incident turbulence show that their features are typical of wrinkled laminar ... continued below

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Pages: (17 p)

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Chan, C. K.; Lau, K. S.; Chin, W. K. (Hong Kong Polytechnic, Kowloon (Hong Kong)) & Cheng, R. K. (Lawrence Berkeley Lab., CA (United States)) December 1, 1991.

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Description

A novel means has been developed for using weak swirl to stabilize freely propagating open premixed turbulent flames (swirl numbers between 0.05 to 0.3). By injecting a small amount of air tangentially into the co-flow of a concentric burner, stationary flames can be maintained above the burner exit for a large range of mixture, turbulence and flow conditions. The absence of physical surfaces in the vicinity of the flame provides free access to laser diagnostics. Laser Doppler anemometry and laser Mie scattering measurements of four flames with and without incident turbulence show that their features are typical of wrinkled laminar flames. The most distinct characteristics is that flame stabilization does not rely on flow recirculation. Centrifugal force induced by swirl causes flow divergence, and the flame is maintained at where the local mass flux balances the burning rate. The flame speeds can be estimated based on the centerline velocity vector, which is locally normal to the flame brush. This flame geometry is the closest approximation to the 1-D planar flame for determining fundamental properties to advance turbulent combustion theories. 18 refs.

Physical Description

Pages: (17 p)

Notes

OSTI; NTIS; GPO Dep.

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  • 1992 Spring meeting of the Western States Section of the Combustion Institute, Corvallis, OR (United States), 23-24 Mar 1992

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  • Other: DE92017116
  • Report No.: LBL-31581
  • Report No.: CONF-9203140--3
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 7206972
  • Archival Resource Key: ark:/67531/metadc1450705

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Office of Scientific & Technical Information Technical Reports

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  • December 1, 1991

Added to The UNT Digital Library

  • Feb. 10, 2019, 8:45 p.m.

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  • March 18, 2019, 2:23 p.m.

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Chan, C. K.; Lau, K. S.; Chin, W. K. (Hong Kong Polytechnic, Kowloon (Hong Kong)) & Cheng, R. K. (Lawrence Berkeley Lab., CA (United States)). Freely propagating open premixed turbulent flames stabilized by swirl, article, December 1, 1991; United States. (https://digital.library.unt.edu/ark:/67531/metadc1450705/: accessed March 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.