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http://dx.doi.org/10.3795/KSME-B.2009.33.9.699

Flame Structure of a Liftoff Non-Premixed Turbulent Hydrogen Jet with Coaxial Air  

Oh, Jeong-Seog (서울대학교 대학원 기계항공공학부)
Yoon, Young-Bin (서울대학교 기계항공공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.33, no.9, 2009 , pp. 699-708 More about this Journal
Abstract
To understand hydrogen jet liftoff height, the stabilization mechanism of turbulent lifted jet flames under non-premixed conditions was studied. The objectives were to determine flame stability mechanisms, to analyze coexistence of two different flame structure, and to characterize the lifted jet at the flame stabilization point. Hydrogen flow velocity varied from 100 to 300 m/s. Coaxial air velocity was changed from 12 to 20 m/s. Simultaneous velocity field and reaction zone measurements used, PIV/OH PLIF techniques with Nd:YAG lasers and CCD/ICCD cameras. Liftoff height decreased with the increase of fuel velocity. The flame stabilized in a lower velocity region next to the faster fuel jet due to the mixing effects of the coaxial air flow. The flame stabilization was related to turbulent intensity and strain rate assuming that combustion occurs where local flow velocity and turbulent flame propagation velocity are balanced. At the flame base, two different flame structures were found that was the partial premixed flames and premixed flame.
Keywords
Liftoff Flame; Turbulent Non-Premixed Flame; Flame Stabilization Mechanism; Hydrogen Jet;
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