Engine structure modifications effect on the flow behavior, combustion, and performance characteristics of DI diesel engine

The simulation was carried out based on 1.8 L Ford diesel engine and the geometrical modification in structure of piston were considered in terms of bowl movement and the bowl size in four equal increments. Two major conflicting parameters in combustion and engine efficiency were taken into account and visualized in contour plots as the bowl geometry was varied: (1) the air/fuel mixing process demonstrated by Homogeneity Factor and equivalence ratio, (2) combustion initiation and work delivery by heat release rate, pressure curves, and indicated thermal efficiency. A new version of Coherent Flame Model’s sub-model (ECFM-3Z) was adopted during the calculations to shed light into the combustion chemistry and reaction rate in detail. It was found that the bowl displacement toward the cylinder wall, increases the mixture uniformity (higher HF) thus higher pressure and heat release rate peak were obtained with the penalty of combustion delay which substantially reduces the effective in-cylinder pressure. Furthermore, it was demonstrated that smaller bowl size induces better squish and vortex formation in the chamber, although lesser spray penetration and flame quenching owing to the spraywall impingement reduces ignition delay
 

مقالات
حجم فایل4327 کیلوبایت
زبان مقالهENGLISH
سال انتشار2014
محل انتشارEnergy Conversion and Management
مشخصات کلی
تعداد صفحات13
تعداد صفحات محصول1-20

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Engine structure modifications effect on the flow behavior, combustion, and performance characteristics of DI diesel engine

  • تولید کننده: Hadi Taghavifar
  • شناسنامه: MC2-1154-paper3
  • موجودی: در انبار
  • تاریخ چاپ: 2016-10-23
  • نویسنده: Hadi Taghavifar, Shahram Khalilarya, Samad Jafarmadar
  • ژورنال: Energy Conversion and Management
  • رایگان

برچسب ها: Bowl radius, CFD simulation, DI diesel engine, Engine modification, Homogeneity Factor