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Analytical and Numerical Investigation of Fuel Spray Characteristics in a Direct Injection Engine

Farajimoghaddam, Farhad | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48224 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saeedi, Mohammad Hassan
  7. Abstract:
  8. With the increasing number of applications in internal combustion engines, environmental impact and air pollution caused by emissions has been much attention. Natural gas is a promising fuel for limiting pollution laws in many countries. The use of fuel with a higher ratio of hydrogen gas to carbon pollution reduction motor. In this context and with regard to development policy and also due to the diversity basket NGV fuel, fuel injection, has been modeled analytically and numerically in a direct injection engine. In this study, an analytical model for spray injection fuel delivery and is dissolved. The resolution of the method of separation of variables is taken. The effect of the nozzle exit, Mach number and also the effects of gas pressure on the axial velocity spray has been studied. Then using Fluent software to numerical methods and flow jet nozzle output has been modeled. Mach effect at the nozzle exit, the pressure and the distance from the centerline of the jet is shown on the pressure profile and results verified by the expermental. The results show an increase in Mach and pressure ratio increases the length of the potential core of the jet. The turbulent viscosity decreases faster speed jet is centered on the center line. In the case of the pressure profile of the center line of the jet away from the amplitude decreases but does not change the shock cells. Mach number at the nozzle outlet pressure increased with increasing amplitude of the shock cells are formed farther toward the nozzle outlet. Increase pressure nozzle at a local shock cells did not change, but the amplitude increases
  9. Keywords:
  10. Analytical Solution ; Natural Gas ; Variable Separation Method ; Underexpanded Jet ; Fuel Injection ; Underexpanded Supersonic Jet

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