CFD Simulation Calculation And Structural Optimization Of Traction Ventilation System Of Hybrid Electric Locomotive

With the deepening of human socialization,energy and environmental problems have become more and more prominent.In the context of advocating energy conservation and environmental protection around the world,hybrid locomotives have gradually developed in the rail transit industry.Hybrid locomotives have strong adaptability to lines,and multiple power sources are more environmentally friendly.However,multiple power sources also bring more components,making the original compact space of the locomotive even more stretched.With the high-speed and heavy-duty development of railway locomotives,the volume,power and electricity consumption of on-board equipment are increasing.How to ensure the cooling effect of the heating components within a limited volume and ensure that the electrical equipment can work normally is a big problem.The research object of this paper is the main air duct of the locomotive traction ventilation system,mainly how to design the air duct structure so that the cooling air discharged from the fan can be evenly distributed to each traction motor for heat dissipation,and the cooling type is forced air cooling.In this paper,a 1:1 physical model of the cooling air duct is established by the 3D modeling software Creo,the position and size of the baffles and openings in the air duct are measured,and the unnecessary small structures are reasonably simplified.Icepak is used under the ANSYS Workbench platform to create the calculation model and network.When modeling,the traction motor module is replaced by the damping load resistance curve,and the Fluent solver is used for simulation calculation,and finally the post-processing analysis is carried out.The simulation calculation shows that the initial scheme cannot make the forced air evenly distributed to the six traction motors,and the outlet flow of four traction motors cannot meet the cooling requirements.Through the analysis of the air volume,speed and pressure of the calculation results of the initial scheme,targeted structural optimization measures are proposed for the initial scheme.Both optimization schemes can meet the required value and the maximum difference in flow margin is 4% and3%,respectively.The feasibility of the simulation model optimization method is verified to ensure that the traction ventilation system has a good heat dissipation effect.After the final plan is determined,the optimal working point of the fan is calculated to ensure that the fan can provide enough flow for cooling when it is working normally.The pressure value of the working point after the simulation calculation is basically the same as the pressure value,which proves the feasibility of the method..Single-variable measures were taken to verify the effects of different schemes,different air volumes and different ambient temperatures on the overall temperature of the traction motor module.It is found that it is not that the larger the air volume of the fan,the better the cooling effect,but that the cooling effect grows slowly after the air volume increases to a certain extent.At the same time,the ambient temperature has a greater impact on the cooling effect.The lower the ambient temperature,the more heat can be taken away.,so choosing the right fan is the basis for the reliability and economy of the traction ventilation system.