Research On Heat Dissipation Performance Of Radiator In Wheel Loader Cooling System With Different Arrangement

With the rise of national infrastructure,loaders are more and more widely used in national defense,mines,roads,bridges and other infrastructure areas.These fields also require more power and performance for engineering vehicles.At present,the new loader adopts a number of energy-saving technologies,such as high pressure common rail,turbocharging and exhaust gas recycling,which improve the loading capacity and power performance of the loader,but also produce more heat.However,the traditional way of handling the cooling system of the loader is to increase some auxiliary heat dissipation devices or to increase the size of the radiator.These measures have little effect in the limited power cabin space,so the heat of the engineering vehicle is hot Management technology needs to be improved urgently.Based on the theory of hydrodynamics and heat transfer control equation,this paper uses computational fluid dynamics software Fluent simulate the arrangement of various heat dissipation modules,and analyzes the heat transfer characteristics of a 50 type wheel loader's power tank and heat dissipation assembly in combination with the whole vehicle heat balance test.(1)This paper introduces the principle of computational fluid dynamics(CFD)simulation technology and the arrangement of four heat dissipation modules of loader,establishes a simplified physical model of a 50 type loader with different heat dissipation module arrangement under virtual wind tunnel,sets Gambit boundary conditions according to the actual test conditions,and determines Fluent numerical simulation boundary and solution method.(2)By comparing and analyzing the distribution characteristics of air temperature,pressure and velocity in the loader's power tank(especially in the heat dissipation module part),it is found that arrangement mode IV has the advantages of double circulation cooling system and traditional cooling system,that is,greater power,smaller temperature field uniformity factor and lower pressure loss due to the use ofdouble circulation cooling circuit and the independence of water cooling intercooler and hydraulic oil radiator from large circulation circuit.(3)The accuracy of the numerical simulation results under the virtual wind tunnel is verified by the whole vehicle thermal balance test.It is found that the loader carrying the arrangement mode IV heat dissipation assembly has a large heat dissipation.The error between the temperature simulation value and the test value of each radiator inlet and outlet is less than 10%,and the average wind speed error of each measuring point of the heat dissipation assembly outlet is 8.17%,which meets the engineering field error requirements.(4)The variation of axial wind speed along fan hub and blade is analyzed,and it is found that the wind speed is the smallest at hub and increases gradually along blade.In order to study the effect of wind speed uniformity on heat dissipation characteristics of heat dissipation module B,scheme A is proposed.Study Pa;velocity characteristics of the two schemes found that the exit of the scheme B flat due to the small air velocity inhomogeneity factor in the scheme A average speed greater than programme A.