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Evaluation of a Function for Estimating Fuel/Air Equivalence Ratio Distribution Inside Combustion Chamber of Spark Ignition Engine for Pollution Minimization and Maximum Efficiency in Stratified Combustion

Nasseri Oskouie, Shahin | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41881 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Kazemzadeh Hannani, Siamak
  7. Abstract:
  8. The purpose of this study is to determine a function which estimate fuel/air equivalence ratio distribution inside combustion chamber of spark ignition engine for pollution minimization and maximum efficiency. To do this, we developed a code by which, we are able to model one SI engine cycle.
    Seven distributions for fuel/air equivalence ratio were examined which include: Homogeneous, linearly decreasing, linearly increasing, sinusoidal increasing and decreasing, sinusoidal decreasing and increasing, cosinusodal decreasing, and cosinusodal increasing. The average fuel/air equivalence ratio for all of these distributions was 0.85.
    The results for indicated power showed that, sinusoidal increasing and decreasing function produce 2% more power than homogeneous one. By comparing the NOx emission of the seven distributions, it was demonstrated that cosinusodal decreasing reduces NOx emission 43% relative to homogeneous one.
    To investigate the effect of NOx emission and output power simultaneously, the specific NOx emission was studied. This parameter is difined by the ratio of NOx emission to output power.The results for this parameter showed that cosinusodal decreasing distribution has less specific NOx emission than any other distributions. This reduction in specific NOx emission was reported 41% relative to homogeneous distribution.
    The comparision of the emission level for other distribution showed that: If fuel/air mixture is rich near the spark plug and lean for far away mixture, then we will have optimum distribution for specific NOx emission
  9. Keywords:
  10. Internal Combustion Engines ; Quasi Dimentional Simulation ; Multi-Zone Method ; Spark Ignition Engines ; Stratified Combustion ; Fuel/Air Equivalence Ratio

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