The simplified radiator model is more suitable for engineering calculations

In the actual design of automobile radiators, it is necessary to comprehensively consider heat transfer performance, resistance performance, economy and reliability. The model simplification simplifies the heat dissipation belt with louvered fins into multiple rectangular parallelepiped porous media regions. Due to the thin wall and large area of ​​the radiator tube studied, the radiator tube wall is simplified into a double side wall surface of corresponding thickness to reduce the number of solid meshes and reduce the coupling heat transfer in the cold and hot sides of the radiator. Calculate the workload. The simplified radiator model is more suitable for engineering calculations. The creation and meshing of the watershed structure is used to complete the meshing of the radiator calculation model. After the simplified radiator core part and the air flow area structure are relatively regular, the hexahedral structured grid is generated by the division method.

The water chamber part of the radiator uses a division method. Setting of boundary conditions. Inlet boundary conditions: According to the control method of the entrance test conditions in the heat transfer wind tunnel test of the automobile radiator, the air inlet and the water inlet adopt the speed entrance, and the speed direction is perpendicular to the entrance plane. According to the entrance measured by the test The data is set for speed and temperature. Outlet boundary conditions: pressure outlet boundary conditions are used for both the water outlet and the air outlet. The static pressure and “backflow” conditions need to be defined on the pressure outlet boundary. The “backflow” condition is the boundary condition used when a backflow occurs at the pressure outlet boundary. Wall boundary conditions: Because all the walls of the studied radiator are static, there is no surface chemical reaction, and radiation is ignored, so this article mainly sets the thermodynamic boundary conditions on the wall. Because strict thermal insulation is carried out in the heat transfer wind tunnel test, it is assumed that the outer wall of the air channel and the outer wall of the water are adiabatic walls, that is, the heat flux is set to be. According to the simplification of the radiator model, the wall of the water pipe becomes a double-sided wall surface with corresponding wall thickness. Only by coupling the front and back sides in the calculation, the solver can directly use the flow field variables of the adjacent grid to calculate the wall surface. The heat exchange.

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