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http://dx.doi.org/10.3795/KSME-B.2015.39.1.021

Effect of Reduced Valve Overlap on Emission Characteristics of Hydrogen-Compressed Natural Gas Engine  

Lee, Sungwon (Korea Institute of Machinery and Materials)
Lim, Gihun (Korea Institute of Machinery and Materials)
Park, Cheolwoong (Korea Institute of Machinery and Materials)
Choi, Young (Korea Institute of Machinery and Materials)
Kim, Changgi (Korea Institute of Machinery and Materials)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.39, no.1, 2015 , pp. 21-27 More about this Journal
Abstract
In order to meet the current emission regulations (EURO-6), it is necessary to significantly reduce $CH_4$ and $NO_X$ emissions. This study investigated the effect of a reduction in the valve overlap on the combustion and emission characteristics of a hydrogen-compressed natural gas engine under a part-load operating condition. The combustion and emission characteristics were analyzed for each fuel using the original camshaft and an altered camshaft with reduced valve overlap. The results showed that the thermal efficiency was decreased and the fuel flow was increased when using the altered camshaft. The $CO_2$ and $CH_4$ emissions were increased as a result of the reduced thermal efficiency. Under lean operating conditions, the $NO_X$ emission was decreased compared with one of the conventional camshaft. Thus, under the same fuels and operating conditions, it had a harmful influence on the emission characteristics and thermal efficiency.
Keywords
Hydrogen-compressed Natural Gas Blends; Camshaft; Valve Overlap; Emission Characteristics; Thermal Efficiency; Excess Air Ratio;
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Times Cited By KSCI : 1  (Citation Analysis)
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