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Numerical Modeling of Ethanol & Gasoline Direct Injection Spary in an Combustion Chamber

Naghizadeh, Mohammad Mehdi | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46642 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saidi, Mohammad Hassan; Mozafari, Ali Asghar
  7. Abstract:
  8. First studies in internal combustion engines have focused on increasing engine power and efficiency, reducing engine volume and improving fuel quality. However, nowadays most studies are concentrated on decreasing exhaust emissions and usage of regenerative fuels while maintaining engine size, efficiency and power. Surveying fuel type in direct injection engines, requires investigation of microscopic and macroscopic spray characteristics including spray tip penetration, spray cone angle, spray area and sauter mean diameter, since these parameters determine air-fuel mixture quality. In this study, spray of ethanol as a regenerative fuel that reduces emissions such as NOx and CO is investigated in a combustion chamber and compared to its different blends with gasoline. Variation in spray characteristics of these fuels versus ambient pressure, ambient temperature and injection pressure are modeled using Fire 2013 and results are discussed and analyzed comprehensively. It is concluded that in an equivalent injection pressure, ethanol and gasoline spray tip penetration are roughly the same. But spray cone angle, spray area and sauter mean diameter of ethanol are larger than gasoline. However, if the energy content and time of injection of ethanol and gasoline are equivalent, ethanol has a larger spray tip penetration and spray area, and smaller spray cone angle and sauter mean diameter compared to gasoline
  9. Keywords:
  10. Gasoline ; Bioethanol ; Spray Characteristics ; Gasoline Direct Injection Engine ; Combustion Chamber ; Fire Software

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