Auto-ignition and stabilization mechanism of diluted H2 jet flame |
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| Authors: | Wei FENG Zhi-jun WU Jun DENG Li-guang LI |
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| Institution: | [1]Key Laboratory for Power Machinery and Engineering of Ministry of Education, Shanghai Jiao Tong University, Shanghai 200030, China [2]School of Automotive Studies, Tongji University, Shanghai 200092, China |
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| Abstract: | The controllable active thermo-atmosphere combustor (CATAC) has become a utilizable and effective facility because it benefits
the optical diagnostics and modeling. This paper presents the modeling research of the auto-ignition and flames of the H2/N2 (H2/CH4/N2, or H2/H2O2/N2) mixture on a CATAC, and shows curves varying with temperatures of auto-ignition delay, the height of the site of auto-ignition
of lifted flames, and flame lift-off height. The results of auto-ignition delay and the lift-off height are compared the experimental
results to validate the model. A turning point can be seen on each curve, identified with criterion temperature. It can be
concluded that when the co-flow temperature is higher than the criterion temperature, the auto-ignition and lifted flame of
the mixture are not stable. Conversely, below the criterion temperature, the mixture will auto-ignite in a stable fashion.
Stabilization mechanisms of auto-ignition and lifted flames are analyzed in terms of the criterion temperature. |
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