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An experimental investigation of the engine operating limit and combustion characteristics of the RI-CNG engine

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Abstract

In this paper, the radical induced (RI) ignition method was applied into a compressed natural gas (CNG) engine to achieve rapid bulk combustion. The experimental RI-CNG engine was modified from a diesel engine. The combustion chamber of the modified diesel engine was divided into a sub-chamber and a main-chamber. The sub-chamber is physically separated from the main-chamber above the piston and is connected to the main-chamber via several passage holes. CNG is injected into the sub-chamber during the intake stroke and then ignited before the top dead center (TDC) by a spark plug. As the ignition occurs in the sub-chamber, the pressure rises, forcing the gases which contain a number of active radicals out into the main-chamber to ignite the unburned mixture. The purpose of this paper is to study the engine operating limit and the combustion characteristics of the RI-CNG engine. The engine operating limit was accessed with different engine speeds and injection timings. The obtained data including the coefficient of variation (COV), brake specific fuel consumption (BSFC), mass fraction burned and emissions were analyzed.

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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

    Yong Dong, J. K. Yeom & S. S. Chung

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

Correspondence to S. S. Chung.

Additional information

Recommended by Associate Editor Kyoung Dong Min

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., Dong, Y., Yeom, J.K. et al. An experimental investigation of the engine operating limit and combustion characteristics of the RI-CNG engine. J Mech Sci Technol 26, 3673–3679 (2012). https://doi.org/10.1007/s12206-012-0849-x

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  • DOI: https://doi.org/10.1007/s12206-012-0849-x

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