Study On Flow And Heat Transfer Performance Of Plate Fin Heat Exchanger For Engine Of Construction Vehicle

Engineering vehicles are widely used in the background of infrastructure construction,radiator is the key component of the cooling system of engineering vehicles,and plate fin radiator is used in engineering fields,especially engineering vehicles because of its advantages of compact structure,large heat transfer area,etc.Therefore,the design of low resistance,high efficiency plate fin radiator will have far-reaching significance for cost reduction,energy saving and consumption reduction.At the same time,with the rapid progress of computer hardware,computational fluid dynamics(CFD)technology is rapidly developing,CFD technology has the advantages of low input costs,small site constraints,short design and development cycle,so that it is applied to the design,development,optimization of plate fin radiator,which has become an important part of engineering applications.Therefore,in this paper,the theoretical design calculation and computer-aided numerical simulation methods are adopted to investigate the flow and heat transfer performance of different fins of plate fin radiators,so as to finally design an efficient and low resistance excellent plate fin radiator.This paper focuses on the composition,classification and working principle of the plate fin radiator.The core size of the flat fin andcorrugated fin plate fin heat exchanger is obtained by theoretical calculation.The three-dimensional modeling software UG was used to establish the model of the flat fin and corrugated fin,and the embedded disturbance fluid scheme was proposed to achieve enhanced heat transfer.ICEM software was used to mesh the internal watershed and solid domain with an unstructured grid,and ANSYS FLUENT software was used to numerically simulate the designed unit model with low Reynolds number and other models,with velocity inlet and pressure outlet as boundary conditions,and the j heat transfer factor and f drag factor at different Reynolds numbers were calculated,and the CFD-POST software was used to derive the Velocity,pressure,and temperature cloud diagrams are used to investigate the inner mechanism of the influence of the embedded perturbed fluid flat fins and corrugated fins on the heat transfer and pressure distribution inside the heat sink.The research results for the flat straight fins show that(1)the improved triangular,rhombic,and rectangular embedded perturbed fluid flat straight fins have achieved 1.28 times,1.12 times,and 1.04 times of the non-perturbed fins,and exhibit good overall performance;(2)through cloud diagram analysis,it is found that the improved flat straight fin model,by increasing the secondary heat transfer surface area and destroying the boundary layer,achieves the The goal of improving the heat transfer efficiency within the range of reasonable pressure drop;(3)Fit and derive the heat transfer and resistance performance characteristic curves of the perturbed straight fins according to the simulation results.The results of the study on the corrugated fins show that:(1)the temperature in the center area of the corrugated fins is the lowest compared with other areas,so it is necessary to consider the influence of the longitudinal heat transfer of the corrugated fins on the fluid heat transfer;(2)the influence of different geometrical parameters of the fins on the fin performance is differentiated;(3)among the fin length,wing thickness and fin height,the wing length has the greatest influence on the fin performance,the wing thickness has the second,and the fin height has the least influence.