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NOx emission characteristics in turbulent hydrogen jet flames with coaxial air

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Abstract

The characteristics of NOx emissions in pure hydrogen nonpremixed jet flames with coaxial air are analyzed numerically for a wide range of coaxial air conditions. Among the models tested in simple nonpremixed jet flame, the one-half power scaling law could be reproduced only by the Model C using the HO2/H2O2 reaction, implying the importance of chemical nonequilibrium effect. The flame length is reduced significantly by augmenting coaxial air, and could be represented as a function of the ratio of coaxial air to fuel velocity. Predicted EINOx scaling showed a good concordance with experimental data, and the overall one-half power scaling was observed in coaxial flames with Model C when flame residence time was defined with flame volume instead of a cubic of the flame length. Different level of oxygen mass fraction at the stoichiometric surface was observed as coaxial air was increased. These different levels imply that the coaxial air strengthens the nonequilibrium effect.

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Authors and Affiliations

  1. School of Aerospace and Mechanical Engineering, Korea Aerospace University, 200-1 Hwajeon-dong, Duckyang-gu, Koyang-shi, Kyungki-do, 412-791, Korea

    Hee-Jang Moon, Yang-Ho Park & Youngbin Yoon

  2. Graduate School, School of Mechanical and Aerospace Engineering, Seoul National University College of Engineering Seoul National Univ., Daehak-dong, Gwanak-gu, Seoul, 151-744, Korea

    Hee-Jang Moon, Yang-Ho Park & Youngbin Yoon

  3. School of Mechanical and Aerospace Engineering, Seoul National University College of Engineering Seoul National Univ., Daehak-dong, Gwanak-gu, Seoul, 151-744, Korea

    Hee-Jang Moon, Yang-Ho Park & Youngbin Yoon

Authors
  1. Hee-Jang Moon
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  2. Yang-Ho Park
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  3. Youngbin Yoon
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Correspondence to Hee-Jang Moon.

Additional information

This paper was recommended for publication in revised form by Associate Editor Haecheon Choi

Hee-Jang Moon received his B.S. degree in Aeronautical Engineering from Inha University, Korea in 1986. He then received his M.S. and Doctoral degrees from Universite de Rouen, France in 1988 and 1991, respectively. Dr. Moon is currently a Professor at the School of Aerospace and Mechanical Engineering at Korea Aerospace University in Koyang, Korea. He serves on the Editorial Board of the Korean Society of Propulsion Engineers. His research interests are in the area of turbulent combustion, hybrid rocket combustion and nanofluids.

Youngbin Yoon received his B.S. and M.S. degrees in Aerospace Engineering from Seoul National University, Korea in 1985 and 1987, respectively. He received a Ph.D. degree from the University of Michigan in 1994. Dr. Yoon is currently a professor at the School of Mechanical and Aerospace Engineering in Seoul National University, Korea. He is currently on the Editorial board and executive of ILASS-KOREA. The research areas of Dr. Yoon are liquid rocket injectors, combustion instability and control, ram and gas turbine combustor and laser diagnostics.

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Moon, HJ., Park, YH. & Yoon, Y. NOx emission characteristics in turbulent hydrogen jet flames with coaxial air. J Mech Sci Technol 23, 1751–1759 (2009). https://doi.org/10.1007/s12206-009-0409-1

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  • DOI: https://doi.org/10.1007/s12206-009-0409-1

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