| At present,China’s production and sales of new energy vehicles have come out on top in the world,and their cumulative production and sales have already exceeded 1.8 million.New energy vehicle industry is the peak of the development,at the same time,thermal comfort performance in the new energy vehicle research requirements more stringent.In order to study the thermal comfort of the driver in the cab,the numerical simulation of the study of the new energy cab can effectively improve the comfort of the cab of the new energy vehicle.In this paper,the thermal environment inside the cab of a new energy light truck sponsored by Guangdong Lijia Co.,Ltd.is taken as the research object.Firstly,the heat transfer process of the cab is theoretically analyzed,and then the flow field and temperature field inside the cab are studied by combining simulation and experiment.The research content is generally developed from the following aspects:1.Theoretical analysis was adopted to explore the theory of heat transfer process of cab,the Computational Fluid Dynamic(CFD)simulation theory of thermal comfort,and the calculation process of cooling and heating load,laying a theoretical foundation for the experimental research and simulation calculation of the paper.2.Design the cooling condition of the air conditioner in the cab of the test truck I in summer and the heating condition in winter,and analyze the reasons for the cooling difference according to the cooling curve of the main measuring point of the driver and the return air outlet measured in the test.3.A 3d model of the cab was built according to the 1:1 ratio and a human body model was added to the cab.The temperature field of the cab was simulated according to the boundary conditions measured in the test.4.On the basis of numerical simulation,analyze the distribution rules and influences of different air supply temperatures,air supply speeds and air supply angles on the temperature field and speed field of the cab,and use the thermal comfort evaluation index EQT to analyze the thermal comfort of the driver in the second operating condition.According to the situation,combined with theoretical experience,the improvement of partial thermal comfort of cab is suggested.Some improvement suggestions are put forward for local overheating.By analyzing the cloud image results obtained by Fluent simulation,the following conclusions can be deduced:The size of the supply air velocity affects the driving indoor temperature field and velocity field distribution,as each outlet speed 0.5 m/s main section about fell by 1.1℃,the average temperature and the increase of the supply air velocity can effectively improve the driver body temperature uniformity,its minimum limit should ensure that the whole driving indoor air flow can completely,In this way,the thermal comfort of the cab can be satisfied.The air supply temperature has a significant influence on the temperature value of the cab,but it has little influence on the speed distribution and speed value.The air supply Angle has little influence on temperature field and velocity field,and the comfort is better when the Angle is 20° than 0° and 40°.Figure[54]Table[14]Reference[83]... |
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