Research On Development Of Aerodynamics Performance Based On An Electric Truck

With the rise of electric vehicles,the aerodynamic characteristics of the vehicle and the heat dissipation performance of the electric system have got more and more focus.To reduce aerodynamic drag,aerodynamic lift,optimize the lift coefficient of front and rear axles and improve the heat dissipation performance of a electric truck,a CFD method is been used to simulate the aerodynamic drag,lift and the complicated bottom flow field of an electric truck at a high speed,and the heat dissipation performance of its electric system is also been analyzed.And the analysis results have been successfully applied to the development of this vehicle.The main contents of this paper are as follows:Firstly,the researches of automotive aerodynamics are briefly discussed.Then the surface data of the studied electric truck is extracted based on the basic aerodynamics theory and the characteristics of the external flow field.Based on the internal modeling specification of the enterprise,the CFD model of the vehicle’s external flow field is built.After setting operating conditions,its aerodynamic is simulated in Star CCM + software,from which the flow field characteristics of the outer surface and bottom space of the vehicle is studied,and the drag coefficient,the lift coefficient of the vehicle and the lift coefficient of the front and rear axle are obtained.And then a slip test is carried out,from which the vehicle speed and its resistance value could be obtained,and compared which the simulation results.Secondly,in this paper,the heat dissipation of the electric system is simulated.Based on the solution of the external flow field of the vehicle,the heat balance condition of the vehicle is set up,the heat flow field of the electric system is simulated,and the heat dissipation performance of the electric system’s main parts are discussed.Then combined with the flow field characteristics,the influencing factors are analyzed,and the improvement measures are put forward.the optimized results show that the improvement is effective.The research results of this paper have important guiding significance for the development of the aerodynamic performance of an electric truck,and it provide technical support and theoretical guidance for improving the heat dissipation performance of the vehicle’s electric system.