The addition of CNG fuel in conventional diesel engines has increased the efficiency of engines and reduces diesel fuel consumption. The CNG fuel injected into the combustion chamber through inlet air system. The objective of this paper is to investigate of how airflows and CNG fuels are mixed and enter to the engine cylinder. This paper method is based on CFD simulation. The simulation of incoming airflow and CNG fuel on modified diesel engines that are developed with the addition of an inlet valve opening are expected to provide an overview of the effect of inlet valve lift on a dual fuel engine. The structural stress approach by varying the opening of the inlet valve during the default condition of 7.28 mm, 3.64 mm, 10.92 mm, and 14.56 mm. The investigation results shown that at the time of opening at 14.56 indicates the average increase air speed and increase the mass of airflow and fuel. Result shown that the power from the valve opening 14.56 mm has been increase.

Original languageEnglish
Pages (from-to)1301-1318
Number of pages18
JournalInternational Journal of Mechanical Engineering and Technology
Issue number2
Publication statusPublished - Feb 2019


  • Air fuel mixing
  • Compressed natural gas
  • Dual fuel engine
  • Valve lift


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