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Developments of a 3-D CFD Model to Analyze the Gas Exchange Process in the Intake Manifold of an IVVT Engine Open Cycle

Morovatiyan, Mohammad Rasoul | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44912 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Hosseini, Vahid; Mozaffari, Ali Asghar
  7. Abstract:
  8. A 3-D CFD model was developed to study effects of early/late intake valves opening/closing on flow field characteristics in the Intake Manifold (IM) of a spark-ignited gasoline 1.5 Litre, 4-cylinder engine. The main task of IM is to prepare essential air for combustion process into cylinder which should distribute air to total runners of IM properly. In this modeling, combustion process and valve behaviors and how to pass fluid flows through intake valves are simulated separately and they are added to it.HyperMesh, Fluent, GT-Power, and MATLAB were used to create a mathematical model on the geometries of IM in TIBA engine, one National Engine of Iran, obtained from MEGA motor Company. The performance of the model was validated against experimental datum of TIBA engine test from the laboratory of company and also existent figures on main handbooks related to engine; there is a good agreement between them.
    The result of implementing EIVO/EIVC strategies on valve events show that the average of IM pressure has direct relation with the amount of throttle opening; it means that in constant amount of engine speed, with more opening throttle, IM pressure will increase. Also the average of IM pressure has reverse relation with engine speed; it means that in constant amount of throttle opening, with increasing engine speed, the average of IM pressure will reduce. In addition, with considering of early intake valve opening (EIVO) and early intake valve closing (EIVC), the volumetric efficiency will be increased
  9. Keywords:
  10. Intake Manifold ; Gas Exchange ; Variable Valuee Timing (VVT) Engine ; Computational Fluid Dynamics (CFD) ; Three Dimentional of Fluid Flow ; Gasoline Internal Combustion Engine

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