Research On Aerodynamic Modeling Optimization Design Of Vacuum Pipeline Vehicles

Based on the two-dimensional vehicle model,this paper analyses the basic aerodynamic characteristics of the vacuum pipeline vehicle,and compares the effects of two-dimensional vehicle model composed of different shapes of the head and tail on the aerodynamic drag.The basic conclusion between vehicle shape and aerodynamic performance is obtained.Based on this conclusion,an initial three-dimensional vehicle model with vacuum pipeline is established,and the aerodynamic characteristics of the initial model are obtained.Finally,the vehicle model with smaller aerodynamic drag is obtained by parameterizing the three-dimensional vehicle model and optimizing the initial vehicle model with the optimization method,which can provide reference for further research on the vehicle model with vacuum pipeline.Firstly,this paper establishes a relatively simple two-dimensional vehicle model and analyses the meshing of the vehicle.The head and tail of the vehicle have the greatest influence on its aerodynamic characteristics,so different two-dimensional vehicle models are divided into different combination of the head and tail.Then,the aerodynamic characteristics of these different two-dimensional models are further analyzed.Then,based on the two-dimensional vehicle of different head types,the aerodynamic characteristics of these two-dimensional vehicle models are analyzed.After comparing and analyzing the models and referring to some other vehicle models,this paper chooses the arc-shaped front and rear to build the initial three-dimensional vehicle model.The initial three-dimensional vehicle model is meshed and simulated numerically.The aerodynamic performance of the initial three-dimensional model under certain conditions is calculated.Through the parametric modeling method,the parameters are established.The numerical control point makes the shape of the front and rear of the car change with the change of the parameter control point.Then the paper uses Latin hypercube sampling method to extract samples.A total of 60 groups of samples are randomly selected,representing 60 different types of vacuum pipeline vehicles.The vehicle models are numerically simulated,and the approximate model is established after the results are obtained,and the fitting accuracy of the approximate model is tested.Then the three-dimensional vehicle model is optimized by using the optimization algorithm.Automatic optimizationdesign of pipeline vehicle aerodynamic modeling.Finally,the research results show that the pressure difference between the front and rear of the optimized three-dimensional vehicle model is smaller than that of the original model,and the aerodynamic drag coefficient is also smaller than that of the original model.The drag reduction rate reaches 5.52%.The critical speed of Kantrowitz limit phenomenon is delayed from 760 Km/h to 860 Km/h.The drag reduction effect is obvious,which provides a basis for the future design of vacuum pipeline vehicles.Fixed reference.