Research On Performance Of New Energy Vehicle Cooling System Based On Virtual Wind Tunnel

With the continuous consumption of world energy,the new energy industry develops rapidly.The new energy engineering vehicles have obvious advantages in energy saving and emission reduction.Taking a new energy engineering vehicle loader as the research object,the cooling process of the power cabin cooling system of the new energy loader is studied by using the method of computational fluid dynamics(CFD).Firstly,the theoretical heat exchange and pressure loss of cold fluid under different conditions are calculated by the numerical model of radiator.When air flow is the same,heat transfer increases with the decrease of air temperature,and pressure loss increases with the increase of cooling air temperature.When air temperature is the same,heat transfer increases with the increase of air flow,pressure loss increases with the increase of air flow.Under the same air condition,the change of heat exchange is opposite to the change of pressure loss.Secondly,the virtual wind tunnel model of the power cabin was established.After setting boundary conditions,CFD simulation was carried out to obtain the air flow state inside and outside the power cabin under different working conditions.The smoke trail test was carried out in the power cabin in the enclosed workshop and the whole vehicle test of the loader was carried out in the test field.The phenomena in the smoke trail test results are consistent with the phenomena analyzed in the simulation results,the temperature data of the vehicle test results are in good agreement with the temperature data of the simulation results,and the two tests verify the correctness and feasibility of the virtual wind tunnel model simulation of the power cabin from different aspects.Finally,with the goal of increasing the air intake,an improvement scheme was proposed and simulated.The simulation results showed that the heat dissipation performance of each improvement scheme was improved,the heat dissipation effect of the dual-cooling fan speed combination 1 in the improvement scheme 2 was the best,the heat dissipation performance was improved by 6%.The entropy production evaluation model of power cabin was established,the entropy production number of the improved scheme was calculated.By comparing the calculation results,that the smaller the entropy production number,the lower the temperature of the hot fluid outlet of the radiator,the higher the heat dissipation performance.The change rule conforms to the principle of entropy generation minimization,which verifies the correctness of the established entropy generation evaluation model.Figure 50;Table 17;Reference 80...