Effect of compressed natural gas mixing on the engine performance and emissions

Yusaf, T. and Baker, P. and Hamawand, I. and Noor, M. M. (2013) Effect of compressed natural gas mixing on the engine performance and emissions. International Journal of Automotive and Mechanical Engineering, 8 (1). pp. 1416-1429. ISSN 2229-8649

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Cleaner air quality is becoming a global concern, thus to improve the fuel and combustion process is vital. In this paper, computational fluid dynamics (CFD) analysis software CFD-ACE is used to investigate the flow behavior of methane and air in a compressed natural gas (CNG)–air mixer to be implemented in a CNG–diesel dual-fuel stationary engine. The effect of the number of mixer holes on the mixture quality was evaluated. The results of the 3D CFD simulation showed that the 8-hole Venturi mixer gave superior performance compared to the 4-hole mixer. Further analysis was carried out on the 8-hole Venturi mixer to investigate the effect of engine speed on the mass flow rate of CNG and the equivalence air to fuel ratio (1/). The second half of the paper presents comparative performance results between a single cylinder research compression ignition (CI) engine fueled with a CNG–diesel system and a conventional CI engine fueled by conventional diesel. The engine was equipped with the simulated 8-hole Venturi mixer. The result showed a significant reduction in exhaust gas emission components (NOx, CO and CO2) from the CNG–diesel engine compared to the conventional diesel engine, i.e. the reduction rates were on average of 54%, 59% and 31% respectively. The average power output developed by the dual-fuel engine was 10% higher than the diesel over the power curve.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © Universiti Malaysia Pahang - open access journal - Published Version able to be made available to the public.
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering
Date Deposited: 24 Mar 2014 04:51
Last Modified: 10 Apr 2017 02:52
Uncontrolled Keywords: Compressed natural gas; gas-mixer; computational fluid dynamics; dual-fuel engine; gas emission
Fields of Research : 09 Engineering > 0913 Mechanical Engineering > 091305 Energy Generation, Conversion and Storage Engineering
02 Physical Sciences > 0299 Other Physical Sciences > 029999 Physical Sciences not elsewhere classified
10 Technology > 1099 Other Technology > 109999 Technology not elsewhere classified
09 Engineering > 0913 Mechanical Engineering > 091307 Numerical Modelling and Mechanical Characterisation
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
E Expanding Knowledge > 97 Expanding Knowledge > 970110 Expanding Knowledge in Technology
URI: http://eprints.usq.edu.au/id/eprint/24982

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