Three-Dimensional Computational Fluid Dynamics Simulation and Mesh Size Effect of the Conversion of a Heavy-Duty Diesel Engine to Spark-Ignition Natural Gas Engine


Aktaş F.

Journal Of Engineering For Gas Turbines And Power-Transactions Of The Asme, vol.144, no.6, pp.1-12, 2022 (Peer-Reviewed Journal) identifier

  • Publication Type: Article / Article
  • Volume: 144 Issue: 6
  • Publication Date: 2022
  • Doi Number: 10.1115/1.4053717
  • Journal Name: Journal Of Engineering For Gas Turbines And Power-Transactions Of The Asme
  • Journal Indexes: Science Citation Index Expanded, Scopus, Academic Search Premier, PASCAL, Aerospace Database, Applied Science & Technology Source, Communication Abstracts, Compendex, Computer & Applied Sciences, Metadex, Pollution Abstracts, Civil Engineering Abstracts
  • Page Numbers: pp.1-12
  • Keywords: internal combustion engines, computational fluid dynamics, emissions, modeling, natural gas technology, COMBUSTION, METHANE, FLAME

Abstract

Abstract With developing in computer technology, 3D CFD IC engine simulations, which generally use reduced chemical kinetic mechanisms and simplified combustion models, can provide more accurate results along with less initial investment and calculation costs compared to experimental setup. In this study, a heavy-duty diesel engine effects on performance, combustion and emission characteristics by spraying natural gas from the intake port and transforming it into a spark-ignition engine were investigated through 3D ANSYS Forte CFD program. The spark time was accepted as 0.5 °CA bTDC, which was the start of injection time for the diesel injector. Analyzes were carried out at 2300 rpm, full load, 17.5: 1 of high compression ratio, constant air/fuel ratio. Six different global mesh sizes were used in the converted engine model. Performance, in-cylinder combustion, and emission values were examined for these six different global mesh sizes and the most suitable one was tried to be found. As a result of the global mesh size study, it was concluded that the most suitable size was 2.25 mm. In terms of performance, when the data obtained with usage of natural gas were compared to that of diesel fuel, the GIP, IMEP and ITE values were increased by 12.02%, 8.93%, and 8.7%, respectively, while the GISFC value was decreased by 9.78%. When the emission values were examined, it was seen that the engine met the Stage IIIB norms without usage of SCR, DPF and DOC under the conditions.