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Thermal Analysis of Tiba Engine Cylinder Head

Eftekharian, Hamid | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43977 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Afshin, Hossein; Hosseini, Vahid
  7. Abstract:
  8. These days, the heat transfer phenomena is an important issue in internal combustion engines design because of direct effects on the performance, efficiency and emission of engine. One of the main parts is cylinder head which contacts with hot gases in combustion chamber and expose high heat flux. In this thesis, cylinder head of Tiba engine modeled by three dimensional and transient thermal analysis. In this modeling in order to consideration the effect of fluid flow, different domain of cylinder head (water jacket, intake/exhaust ports) has been simulated and appended to the model. Also combustion phenomena modeled separately, and then the heat transfer coefficient in the surface of combustion chamber has been determined using the derived results of combustion modeling and Woschni correlation. It should be noted that, the procedure of opening/closing of the valves is modeled in order to simulate the real conditions as far as possible. The results are validated against the experimental results of the manufacture Company; there is a good agreement between them. The results show that the mean temperature of cylinder head increases gently with an enhance in engine speed. The temperature distribution indicated that the critical aria with maximum temperature is between the exhaust valve and spark plug bridge. The distribution of heat flux in the combustion chamber and heat transfer coefficient in the intake/exhaust port versus crank angle has also been reported. In order to study the effectives parameter variation in engine heat transfer, cylinder head material as structural parameter, the water temperature at water jacket inlet and ignition angle as operating parameters is been considered. A sensitive analysis results show that the most effective parameter on the mean temperature of cylinder head is the water temperature at water jacket inlet
  9. Keywords:
  10. Heat Transfer Coefficient ; Thermal Analysis ; Cylinder Head ; Convection Heat Transfer ; Combustion Chamber ; Computational Fluid Dynamics (CFD) ; Combustion Simulation ; Tiba Vehicle

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