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Effect of Compressed Natural Gas Mixing on the Engine Performance and Emissions

M. M., Noor and Talal, Yusaf and Baker, P. and Hamawand, I. (2013) Effect of Compressed Natural Gas Mixing on the Engine Performance and Emissions. International Journal of Automotive and Mechanical Engineering (IJAME), 8. pp. 1416-1429. ISSN 1985-9325(Print); 2180-1606 (Online)

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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 8hole Venturi mixer. The result showed a significant reduction in exhaust gas emission components (NOx, CO and CO) 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.

Item Type: Article
Additional Information: Muhamad Mat Noor (M. M. Noor)
Uncontrolled Keywords: Compressed natural gas; Gas-mixer; Computational fluid dynamics; Dual-fuel engine; Gas emission
Subjects: T Technology > TS Manufactures
Faculty/Division: Faculty of Mechanical Engineering
Depositing User: Noorul Farina Arifin
Date Deposited: 11 Apr 2014 07:21
Last Modified: 03 Mar 2015 09:24
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