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Manufacturing Constant Volume Combustion Chamber and Simulation and Analysis of the Flame front Development

Rezaei, Foad | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44154 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Kazemzadeh Hannani, Siamak
  7. Abstract:
  8. The application of internal combustion engine is vast in different context, such as transportation and power generation. Therefore to investigation of these objects and the importance of flame front development, a combustion chamber with constant volume is designed and manufactured. The chamber designing is based on the experimental knowledge and numerical simulation of chamber and glasses. The combustion chamber made of stainless steel and contained transparent quartz glasses in both side of it to provide the ability of using schlieren photography method and investigation of flame. The great advantage of present chamber is the capability of different type of combustion, including fuel and air premixed combustion and stratified combustion with direct injection, that are prepared by different situation of spark plug electrode. Another advantage of this chamber is possibility of usage of different injector. Thus to experiment different kind of injectors, there is a housing in the top of the chamber to exchange injector simply.
    Some experiments have studied the properties of gas jet in combustion chamber with constant volume. The experiment is done for Helium gas in 2-8 bar of the injection pressure and 1-4bar of chamber pressure. The gas jet photos are saved with schlieren photography method and are analyzed by image processing in Matlab software. These photos have good agreement with Boyan and Furuyama model. The results show, the penetration depth will be increased by injection pressure growth and decreased by chamber pressure growth. Also the maximum of jet cone angle is not depended on injection pressure. Finally, the multidimensional simulation and numerical fluid mechanics (CFD) is used to investigate engine. Applying complicated model to CFD codes has been resulted to achieve obvious comprehension of physical and chemical process in the cylindrical combustion chamber. For this purpose, the AVL-Fire software has been used to fuel jet simulation. The motion governing equations, species transport and turbulency models are represented briefly according to AVL-Fire to explain this software. The simulation results are validated with experimental results. The results indicate that under expansion and shock wave are inevitable inside the chamber. Also gas fuel injection with high pressure decreases thermal efficiency of the direct injection spark ignition (DISI)
  9. Keywords:
  10. Combustion Chamber ; Numerical Simulation ; Direct Injection Spark Ignition (DISI)Engine ; Schileren Optical Method ; AVL-Fire Software

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