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Numerical Evaluation of Engine Performance and Emission Characteristics of Rapeseed Oil and its Blends in Diesel Engines

Saeedan, Mohammad | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49513 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saeedi, Mohammad Hassan
  7. Abstract:
  8. Today, the importance of transportation and motor vehicles is crystal clear for everyone. On the other hand, energy crisis and the emissions of these vehicles are two fundamental problems of internal combustion motors. On account of this, the diesel vehicles have absorbed researchers’ attentions due to their higher efficiency and low fuel consumption.Due to high diesel vehicle efficiency, it is tried to substitute gasoline vehicles with these vehicles. In addition, the unrecyclable nature of fossil fuels has led to more attention to renewable energies such as biofuels. A lot of kinds of herbal oils have identical characteristics with diesel fuel.In this research, the combustion of Rapeseed oil in National Diesel Engine (EFD) has been simulated and the effect of different parameters on performance and the emissions of this engine have been investigated.The results of simulations indicate that due to the low thermal value of biofuel combustion, the output power and torque of motor are reduced. However, the low released heat and the low temperature of gases in the cylinder have caused the reduction of NOx and the existence of Oxygen atoms in this fuel structure has caused the reduction of CO, soot and unburned hydrocarbons. The change in spraying angle leads to coincidence fuel with the cylinder enclose and weak mixing and consequently reduction of NOx and soot increment and low power generation.Another parameter investigated in this research is Increase of the percentage of recycling exhaust gases which is leading to reduction of CO2 in fuel leading to the reduction of NOx and power generation and the increment of soot. The last parameter investigated is the change of fuel spraying angle. By leading spraying angle, the mixture is uniformed and consequently soot and output power are increased and NOx is decreased. By lagging spraying angle, the expansion occurs, consequently leading to soot and output power increment and NOx decrement. Finally, by changing these parameters, optimized point could be found in which the motor is in its best operation and pollution emissions
  9. Keywords:
  10. Diesel Engines ; Nitrogen Oxides ; Soot ; Biofuel ; Numerical Investigation ; Rapeseed Oil

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