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http://dx.doi.org/10.3795/KSME-B.2008.32.3.190

Study of Hydrogen Turbulent Non-premixed Flame Stabilization in Coaxial Air Flow  

Oh, Jeong-Seog (서울대학교 대학원 기계항공공학부)
Kim, Mun-Ki (서울대학교 대학원 기계항공공학부)
Choi, Yeong-Il (서울대학교 대학원 기계항공공학부)
Yoon, Young-Bin (서울대학교 기계항공공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.32, no.3, 2008 , pp. 190-197 More about this Journal
Abstract
It was experimentally studied that the stabilization mechanism of turbulent, lifted jet flames in a non-premixed condition to reveal the newly found liftoff height behavior of hydrogen jet. The objectives are to report the phenomenon of a liftoff height decreasing as increasing fuel velocity, to analyse the flame structure and behavior of the lifted jet, and to explain the mechanisms of flame stability in hydrogen turbulent non-premixed jet flames. The hydrogen jet velocity was changed from 100 to 300m/s and a coaxial air velocity was fixed at 16m/s with a coflow air less than 0.1m/s. For the simultaneous measurement of velocity field and reaction zone, PIV and OH PLIF technique was used with two Nd:Yag lasers and CCD cameras. As a result, it was found that the stabilization of lifted hydrogen diffusion flames is correlated with a turbulent intensity and Karlovitz number.
Keywords
Hydrogen; Liftoff Flame; OH PLIF; PIV;
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