Study On Simulation Of Aluminum Plate-Fin Heat Exchanger For One Bus Based On CFD

In the automotive cooling system,the role of the radiator is very important.The radiator transfers heat from the radiator itself to the outside air through its own structure,so that the engine coolant can be kept within a certain temperature range,ensuring that the engine does not run.No accident due to high temperature.With the gradual progress of technology,the development direction of the engine tends to be towards high power and low emissions.Therefore,it is very important for car designers to design a compact cooling system with high reliability and low power consumption.Therefore,in the initial stage of radiator development,it is necessary to pay attention to the heat exchange capacity and air resistance of the radiator.The design of radiators also tends to develop in a small and compact structure.The application of computational fluid dynamics has greatly shortened the design and development cycle of radiators.In this paper,the CFD software FLUENT is used for numerical simulation to perform coupling calculations.The orifice-plate fin heat sinks are coupled to calculate the heat transfer and flow pressure loss performance of the plate-hole fin radiators.Different pore sizes(such as two times,four times and six times thickness of fin plate)are calculated at different flow rates(such as 3m/s,7m/s and 11m/s).The radiator model was used to analyze the effect of the aperture and cooling air flow rate on the performance of the radiator.Then the heat exchange and flow pressure loss performance of the louver fin radiator was studied.The research focused on finned oblique angles(such as 25°,30°and 35°),fin opening angles(such as 25°,30°and 35°)and fins(one point five times,two times,two point five times thickness of fin plate).The influence of the open angle on the overall performance of the heat exchanger,and the influence of the structural change on the performance of the louver fin radiator under the conditions of different cold air inflow speeds were studied.Finally,the heat transfer of the corrugated fin radiator was studied.With the flow pressure loss performance,the influence of the corrugated fin type on the overall performance of the heat exchanger is emphatically studied.The performance of the heat sink is compared by the classic triangular corrugated wing and the sine wave corrugated wing.At the same time,the influence of structural changes on the performance of corrugated fin radiators under different conditions of cold air flow velocity is also discussed,which will provide guidance for the selection of radiators for passenger cars.The research results show that the holes size of the aperture plate of the aperture plate radiator has little effect on the overall heat exchange efficiency of the radiator unit,and has little influence on the aerodynamic losses of the cold air flow.The oblique needle angle of the louver type fin radiator also influences the aerodynamic performance of the radiator.When the structure is constant,the flow speed of the cooling air has a significant influence on the aerodynamic performance and the heat transfer performance of the louver type fin radiator;at the same time,the same flow at the speed,the fin spacing of the louver radiator has little effect on the aerodynamic performance of the radiator.