| 3D numerical simulation on working process of the Internal Combustion Engine(ICE)is a method to study the coupling effects of the intake and exhaust flow,spray and combustion in the cylinder,and it can be used to predict the output and emissions of the engine.Therefore it plays an important role in the research and design.Nowadays,most of the CFD software of ICE used is from abroad,it is impossible to develop our own software and affects the development of ICE industry in China.So it is very significant to develop the threedimensional simulation software with our own code.This thesis is based on an in-house general transport equation solver GTEA,which is developed by the Research Institute of Power Engineering Technology of Harbin Engineering University.The key technologies of 3D numerical simulation of ICE working process mainly consist of the moving mesh,spray and combustion model,and the flow solution method in the cylinder.Based on the unstructured dynamic grid model on GTEA software,it is put forward the algorithm and model of the dynamic layer mesh and sliding mesh,changed the way of variable evaluation when the mesh layer deleting or adding,and set up the 3D dynamic model of the TBD 620 diesel.The control equations for gas phase in the cylinder are solved with the Euler method and SIMPLEC algorithm is used for the pressure-velocity coupling.Dealing with the blocked cell specially when solve the equation,adding the coefficient of the equation set produced by sliding faces,and validating the program by pure compression cases.The control equations for liquid phase in the cylinder are solved by the Lagrangian method.For locating the particles of a fuel spray,the Face based Fast Particle Tracking Method is developed,and using the Particle-In-Cell method to realize the gas-liquid coupling.The 3D numerical simulation case of TBD 620 working process indicates that the developed software can be applied for the research and design of the ICE. |
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