| The internal flow condition of intake/exhaust port and cylinder effect directly impulse coefficient,mixture formation and combustion. The fuel atomization gets more attention. Numerical simulation calculation method helps us to study the internal flow and engine fuel injection atomization.This paper investigated intake/exhaust process and the internal flow of the cylinder using professional CFD software-STAR-CD. Based on the Three-dimensional numerical simulation method, the research of the parameters impacting engine fuel jet and atomization was carried out.In order to get accurate initial and boundary conditions, the author made a work performance experiment on a diesel engine, with the Simulation software-BOOST to get the initial and boundary conditions. The simulation result agreed well with the experimental results, so the simulation result can be used for CFD simulation. Used the reverse engineering and combined with the three-dimensional modeling software, we can make the Three-dimensional model including Intake/exhaust port> Valve and Cylinder. Used the mesh tools, defined the moving grid event, and obtained the 3D grid which is adapted for cycle simulation. Through the simulation of the intake and exhaust process, the author analyzed the internal flow condition of port, and the influence factor such as port geometric shapes,valve overlapping angle and valve lift. Meanwhile, the Analysis for the Turbulent flow of the cylinder compression stroke was carried out. Through the simulation of the Diesel fuel injection and atomization process, we can visual the spray atomization process in detail, research oil beam angle,nozzle height how to influence the fuel atomization and mixture formation. |
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