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Effect of fuel delivery ratio of Diesel-CNG dual fuel engine on performance and emissions

Ismail, Muammar Mukhsin (2017) Effect of fuel delivery ratio of Diesel-CNG dual fuel engine on performance and emissions. Masters thesis, Universiti Tun Hussein Onn Malaysia.


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Diesel fuel, which mainly used in transportation produces emission that contributes to global warming. Research advancement showed that the combination of Diesel-CNG fuel is able to reduce exhausts emissions. However, an uncontrolled dual fuel blending ratio with respect to operating load may cause poor engine performance with high hydrocarbon (HC) and carbon monoxide (CO) emissions compared to a diesel engine. The purpose of this study is to quantify the potential CNG fuel substitution at the specific engine load, to identify the blending limit of dual fuel ratio before the occurrence of knock, and to analyse the performance and emission between diesel engine and dual fuel engine. A 2.5 litre four cylinder diesel engine direct injection with common-rail was used as the experiment subject. The fuel ratio tested were 90 % DDF, 80 % DDF and 70 % DDF, which represents the diesel to CNG fuel mass ratio which are 90:10, 80:20 and 70:30 respectively. The result showed the performance of the dual fuel engine is lower than the diesel engine at 1500 rpm engine speed. At higher engine speed, 70 % DDF showed comparable performance as the diesel engine with a reduction of Nitrogen Oxide (NOX) emission but high HC emission and some occurrences of knock phenomenon. It suggested that the blending limit of CNG fuel ratio should not exceed more than 70:30, and it was found suitable for operation at engine speed higher than 1500 rpm without any knock occurrence.

Item Type: Thesis (Masters)
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ751-805 Miscellaneous motors and engines
Depositing User: Mr. Mohammad Shaifulrip Ithnin
Date Deposited: 01 Apr 2018 04:01
Last Modified: 01 Apr 2018 04:01
URI: http://eprints.uthm.edu.my/id/eprint/9934
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