Analysis And Optimization Of The Aerodynamic Characteristics Of The Front And Rear Wings Of The FSAE Race Car Based On ISIGHT

With the rapid development of Formula SAE(FSAE),the aerodynamic performance of racing car becomes a focus of lots of university FSAE teams.Due to the characters of the FSAE race track such as narrow width,many turns and short straight path,an excellent carbody design of racing car with good negative lift can greatly improve the maximum cornering speed,braking performance and stability under critical conditions,which makes the car much more competitive.Therefore,it is of great significance to carry out research on the aerodynamics of FSAE racing car.This paper takes the Yang Zhou University FSAE racing car as the research object.By studying the relevant literatures,the research work can be divided into the following sections.Firstly,this paper introduces the basic theories of aerodynamics and CFD.On this basis,the influences of aerodynamics on the power,economy and handling stability of racing cars are explored.The evaluation procedures of the racing car aerodynamic characteristics including:establishing the initial 3D model of FSAE racing car with CATIA,meshing the model by importing 3D model into ICEM and running numerical simulation analysis by Fluent.Secondly,aiming at the problem of insufficient negative lift of car,this paper increases the negative lift of racing car by adding front and rear wings.Based on the fully study of the basic parameters of airfoil and its aerodynamic characteristics,combining with the requirements of FSAE rules and the matching of negative lift of front and rear wings,several airfoils commonly used in racing cars are compared and its aerodynamic characteristics are analyzed by Profili.Then,the initial front and rear wing model of the car is created by CATIA.In the end,the aerodynamic characteristics of the racing model incorporating the front and rear wings are further studied.Finally,due to the strict restrictions on the size and installation position of the aerodynamic device,which limited the obtainment of negative lift in defined design space.To solve this problem,a parametric model is established in order to optimize the structural parameters of the front and rear wing.Using ISIGHT to build a simulation(DOE,Design of Experiments)test design platform,CATIA,ICEM,and Fluent are integrated for co-simulation,by using the Approximation model for multi-objective optimization of wing angle of attack and inter-wing clearance.According to the optimization results,the model is updated,and the CFD numerical simulation analysis of the vehicle is carried out to improve the shortage of the external flow field through aerodynamic characteristics of optimization.Using the lap speed simulation software Optimum Lap,the track model was established based on the FSAE competition track in Hubei Xiangyang to simulate the vehicle performance.Overall,the negative lift of the racing car has been improved after adding pneumatic kits After multi-objective optimization of the angle of attack and clearances of the front and rear wing by ISIGHT software,the lift-drag ratio and the handling stability and the design efficiency are improved.Meanwhile,the optimization workload is greatly reduced.Therefore,this method has instructive significance for the optimization design of aerodynamic suite of FSAE racing car.