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http://dx.doi.org/10.3795/KSME-B.2013.37.4.387

Study of Performance and Knock Characteristics with Compression Ratio Change in HCNG Engine  

Lim, Gi Hun (Dept. of Environment & Energy Mechanical Engineering, Univ. of Science and technology)
Lee, Sung Won (Korea Institute of Machinery and Materials)
Park, Cheol Woong (Korea Institute of Machinery and Materials)
Choi, Young (Korea Institute of Machinery and Materials)
Kim, Chang Gi (Korea Institute of Machinery and Materials)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.37, no.4, 2013 , pp. 387-394 More about this Journal
Abstract
Hydrogen-compressed natural gas (HCNG) blend has attracted attention as a fuel that can reduce $CO_2$ emissions because it has low carbon content and burns efficiently. An increase in the compression ratio of HCNG engines was considered as one of the methods to improve their efficiency and reduce $CO_2$ emissions. However, a high combustion rate and flame temperature cause abnormal combustion such as pre-ignition or knocks, which in turn can cause damage to the engine components and decrease the engine power. In this study, the performance and knock characteristics with a change in the compression ratio of an HCNG engine were analyzed. The combustion characteristics of HCNG fuel were evaluated as a function of the excess air ratio using a conventional CNG engine. The effects of the compression ratio on the engine performance were evaluated through the same experimental procedures.
Keywords
CNG; HCNG; Compression Ratio; Thermal Efficiency; Knock;
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