Investigation of Burn Duration and NO Emission in Lean Mixture with CNG and Gasoline

Hüseyin Emre Doğan, Osman Akın Kutlar, Majid Javadzadehkalkhoran and Abdurrahman Demirci
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Hüseyin Emre Doğan: Graduate School of Science, Engineering and Technology, Istanbul Technical University, Istanbul 34469, Turkey
Osman Akın Kutlar: Faculty of Mechanical Engineering, Istanbul Technical University, Istanbul 34437, Turkey
Majid Javadzadehkalkhoran: Graduate School of Science, Engineering and Technology, Istanbul Technical University, Istanbul 34469, Turkey
Abdurrahman Demirci: Mechanical Engineering Department, Karamanoğlu Mehmetbey University, Karaman 70200, Turkey

Energies, 2019, vol. 12, issue 23, 1-18

Abstract: The results of experiments performed by gasoline and natural gas fuels in a single cylinder research engine were evaluated in this study. The main objective of this study is to compare exhaust gas emissions, efficiency, and burn durations for both fuels in stoichiometric and lean mixture. At the same time, cycle to cycle variation in these operating conditions should not exceed an acceptable value. In the ultra-lean mixture, gasoline fuel exceeded this determined limit before Compressed Natural Gas (CNG). Therefore, the reduction in NO was restricted by cyclic variations. In combustion analysis, although the burn duration of the gasoline in stoichiometric conditions was shorter than CNG, this situation reversed in favor of CNG in the ultra-lean mixtures. Contrary to some studies in the literature, the spark advance and ignition delay for CNG were the same or shorter than gasoline in this study. The primary reasons for this change are the high compression ratio and the different combustion chamber geometry. The increase in turbulence intensity has different effects on CNG and gasoline. As a result, it has been observed that NO emissions can meet the limits without a loss of efficiency for this engine operated with CNG under the ultra-lean mixture.

Keywords: natural gas; lean burn; nitrogen oxide emission; cyclic variations; burn duration (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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