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“Prediction of Stratified Charge Engine Performance Using HC Fuels”

Aliramezani, Masoud | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43445 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Mozafari, Ali Asghar
  7. Abstract:
  8. The partially stratified charge (PSC) approach involves micro-direct-injection of pure fuel or a fuel air mixture, to create a rich zone in the region around the spark plug. A theoretical model is presented in this research to predict ignition delay and combustion process in partially stratified charge engine. It considers flame progress through rich and lean regions. Step by step calculations will be carried out in both regions. The process continues to the point where all the fuel is burned. At each step for one degree rotation of the crank shaft, there is a change in cylinder volume and mole fraction burned due to burning of a fraction of the mixture. Considering heat transfer from the cylinder contents to its surrounding area and friction losses, some important operating parameters such as indicated and break values of mean effective pressure, power, thermal efficiency and specific fuel consumption, are predicted. Calculations will also provide in-cylinder pressure and temperature variation with the crank position as well as concentration of species existing in the combustion products. Predicted values obtained by the model for natural gas fuel are compared with the corresponding experimental values to evaluate the accuracy of the model. The comparison shows logical agreement between theoretical and measured values. Then prediction was generalized for other Hydrocarbon fuels such as gasoline and propane
  9. Keywords:
  10. Thermodynamic Model ; Computer Modeling ; Stratified Charge Engine ; Partial Stratified Charge (PSC) ; Nonspherical Flame Propagation

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