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Comparison of experimental and predicted atomization characteristics of high-pressure diesel spray under various fuel and ambient temperature

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Abstract

The aim of this study is to investigate the effects of the fuel temperature and the ambient gas temperature on the overall spray characteristics. Also, based on the experimental results, a numerical study is performed at more detailed and critical conditions in a high pressure diesel spray using a computational fluid dynamics (CFD) code (AVL, FIRE ver. 2008). Spray tip penetration and spray cone angle are experimentally measured from spray images obtained using a spray visualization system composed of a high speed camera and fuel supply system. To calculate and predict the high pressure diesel spray behavior and atomization characteristics, a hybrid breakup model combining KH (Kelvin-Helmholtz) and RT (Rayleigh-Taylor) breakup theories is used. It was found that an increase in fuel temperature induces a decrease in spray tip penetration due to a reduction in the spray momentum. The increase of the ambient gas temperature causes the increase of the spray tip penetration, and the reduction of the spray cone angle. In calculation, when the ambient gas temperature increases above the boiling point, the overall SMD shows the increasing trend. Above the boiling temperature, the diesel droplets rapidly evaporate immediately after the injection from calculation results. From results and discussions, the KH-RT hybrid breakup model well describes the effects of the fuel temperature and ambient gas temperature on the overall spray characteristics, although there is a partial difference between the experimental and the calculation results of the spray tip penetration by the secondary breakup model.

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Authors and Affiliations

  1. Graduate School of Hanyang University, Department of Mechanical Engineering, Hanyang University, 17 Haengdang-dong, Sungdong-gu, Seoul, 133-791, Republic of Korea

    Su Han Park

  2. Department of Mechanical Engineering, Hanyang University, 17 Haengdang-dong, Sungdong-gu, Seoul, 133-791, Republic of Korea

    Hyung Jun Kim & Chang Sik Lee

Authors
  1. Su Han Park
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  2. Hyung Jun Kim
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  3. Chang Sik Lee
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Corresponding author

Correspondence to Chang Sik Lee.

Additional information

This paper was recommended for publication in revised form by Associate Editor Kyoung Doug Min

Su Han Park received his B. S and M. S. degrees from the department of Mechanical Engineering, Hanyang University in 2006 and 2008, respectively. He is currently a Ph. D. candidate. His research interests are the exhaust emission reduction related to spray-atomization characteristics of alternative fuels (biodiesel, DME, bioethanol etc.)

Hyung Jun Kim received Ph. D degree from Hanyang University in 2010. Also, he received B. S. and M. S. degrees from Hanyang University in 2001 and 2003, respectively. Dr. Kim is currently a Post Doctorate at BK21 innovation design working group in Hanyang University. His research interests are on spray and combustion analysis using KIVA-3V as numerical method.

Chang Sik Lee received the Ph. D degree from Hanyang University in 1980. Also, he received B. S. and M. S. degrees from Hanyang University in 1967 and 1974, respectively. Dr. Lee is currently a professor at the Department of Mechanical Engineering in Hanyang University, Seoul, Korea. His research interests are on the development of the alternative fueled vehicle and the improvement of the combustion and emission characteristics in the internal combustion engine.

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Park, S.H., Kim, H.J. & Lee, C.S. Comparison of experimental and predicted atomization characteristics of high-pressure diesel spray under various fuel and ambient temperature. J Mech Sci Technol 24, 1491–1499 (2010). https://doi.org/10.1007/s12206-010-0417-1

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  • DOI: https://doi.org/10.1007/s12206-010-0417-1

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