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An experimental study on the effects of impingement-walls on the spray and combustion characteristics of SIDI CNG

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Abstract

Compressed natural gas (CNG) is regarded as one of the most promising alternative fuels, and maybe the cleanest fuel for the sparkignition (SI) engine. In the SI engine, direct injection (DI) technology can significantly increase the engine volumetric efficiency and decrease the need of throttle valve. During low load and speed conditions, DI allows engine operation with the stratified charge, and the use of extremely lean fuel-air mixture enables relatively higher combustion efficiency. In this study, a combustion chamber with a visualization system is designed. The spray development and combustion propagation processes SIDI CNG were digital recorded. It was found that high injection pressure reduced the ignition probability significantly because of quenching of flame kernel. To improve the ignition probability, three kinds of impingement-walls were designed to help the mixture preparation. It was found that the CNG-air mixture can be easily formed after spray-wall impingement and the ignition probability was also improved. The results of this study can contribute important data for the design and optimization of spark-ignition direct injection (SIDI) CNG engine.

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Authors and Affiliations

  1. Faculty of Aerospace Engineering, Shenyang Aerospace University, Liaoning Shenyang, 110136, China

    Yu Liu

  2. Department of Mechanical Engineering, Dong-A University, Busan, 604-714, Korea

    J. K. Yeom & S. S. Chung

Authors
  1. Yu Liu
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  2. J. K. Yeom
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  3. S. S. Chung
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Corresponding author

Correspondence to S. S. Chung.

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Recommended by Associate Editor Oh Chae Kwon

Yu Liu received his Ph.D in Mechanical Engineering from Dong-A University, Busan, Korea in 2011. He is currently a lecturer at Shenyang Aerospace University in China. He is interested in engine combustion mechanism, combustion simulation and engine substitute fuel.

Jeong Kuk Yeom received his Ph.D in Mechanical Engineering from Doshisha University, Kyoto, Japan in 2001. In 2006, he joined the Department of Mechanical Engineering, Dong-A University, Busan, Korea, where he is currently a professor in the Department of Mechanical Engineering. He is interested in diesel spray and biodiesel fuels.

Sung Sik Chung received his Ph.D in Mechanical Engineering from Keio University, Tokyo, Japan in 1995. In 1984, he joined the Department of Mechanical Engineering, Dong-A University, Busan, Korea, where he is currently a professor in the Department of Mechanical Engineering. He is interested in engine combustion analysis and alternative fuel.

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Liu, Y., Yeom, J.K. & Chung, S.S. An experimental study on the effects of impingement-walls on the spray and combustion characteristics of SIDI CNG. J Mech Sci Technol 26, 2239–2246 (2012). https://doi.org/10.1007/s12206-012-0604-3

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  • DOI: https://doi.org/10.1007/s12206-012-0604-3

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