• Effects of fuel injection strategies in a RCCI heavy-duty diesel engine

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      https://www.ias.ac.in/article/fulltext/sadh/046/0006

    • Keywords

       

      Combustion simulation; RCCI engine; fuel injection; syngas; emissions

    • Abstract

       

      The main goal of the present study was to explore the impacts of various fuel injection strategies in a heavy-duty Direct Injection (DI) diesel engine operating under diesel-syngas combustion conditions computationally using CONVERGE Computational Fluid Dynamic (CFD) code. The SAGE combustion model coupled with a chemical kinetic n-heptane/toluene/PAH (Poly-Aromatic Hydro-carbons) mechanism that consisted of 71 species and 360 reactions were used to simulate the diesel-syngas combustion process and the formation and oxidation of emissions, e.g., Nitrogen Oxides (NOx), Particulate Matter (PM), Carbon Monoxide (CO), and Unburnt Hydro-Carbons (UHC). The separate effects of main (8 to 18 Crank Angle (CA) Before Top Dead Center (BTDC) with 2 CA steps) and post-injection (35 to 55 CA (After Top Dead Center) ATDC with 5 CA steps) timing of diesel fuel on the combustion characteristics and exhaust gas emissions were investigated under diesel-syngas combustion conditions. The numerical achievements revealed that the substitution part of the diesel with a CO–H2 gaseous mixture led to a considerably lower PM and UHC emissions in the exhaust gases with a CO penalty rate. Maximum Combustion Temperature (MCT) and Heat Release Rate Peak Point (HRRPP) were increased as Main-Injection Timing (MIT) was advanced. Also, advancing MIT led to a considerably higher level of NOx emissions but lower PM formation. Moreover, compared to baseline engine operating conditions, post-injection of diesel at 35 CA ATDC reduced both PM and UHC emissions simultaneously by nearly 26.5 and 89%, respectively.

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    • Author Affiliations

       

      BAHRAM JAFARI1 MAHDI SEDDIQ2

      1. Faculty of Engineering Modern Technologies, Amol University of Special Modern Technologies (AUSMT),Amol, Iran
      2. Department of Mechanical Engineering, Faculty of Engineering, Ayatollah Boroujerdi University,P.O. Box 69199-69411, Borujerd, Iran
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