Effect of Flatness and Roughness of Sealant Contact Surfaces on Diesel Injectors Performance

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Fozi, Mostafa | 2015

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 47983 (45)
University: Sharif University of Technology
Department: Aerospace Engineering
Advisor(s): Adib Nazari, Saeed
Abstract:
Surface roughness has an enormous influence on many important physical phenomena such as contact mechanics, sealing, adhesion and friction. Contact mechanics was studied as an important topic for long years in order to realize the friction phenomena, contact fatigue and fluid leaking between rough surfaces. Therefore, the contact of rough surfaces has been widely invistageted by engineers for different purposes like rejouvination, prevention of environmental pollution and stress analysis. Failure modes have been studied in this research for a specific type of injector by experimental methods. After that, injector's rough surfaces were modeled. Firstly the proper point cloud was modeled by MATLABtm and after being pre-treated in SolidWorkstm software, these surfaces were analyzed by finite element software ABAQUS. Finally, by comparing these results with experimental results, leakage of surface roughness possibility was discussed and it was defined that if the roughness of the surface is more than 0.03 micrometers the possibility of leakage between the contact surface is very high
Keywords:
Finite Element Method ; Roughness ; Contact Mechanics ; Leakage ; Seals ; Diesel Injectors

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