| As a kind of transportation tool which integrates the manned aircraft and the automobile,the flying automobile has developed for hundreds of years.The research and development of flying car in Europe and America started early,and has formed initial productization.Domestic research and development of flying vehicles started late,most of them stay in the experimental stage.In this paper,a new structure of flying vehicle which can realize vertical take-off and landing is proposed based on the advantages of the existing mature design of flying vehicle at home and abroad.First of all,through scheme demonstration,demand analysis,and comparison of advantages and disadvantages,this paper studies the existing design scheme of domestic and foreign flying vehicles,so as to determine the aerodynamic layout of a new flying vehicle which combines the tilting culvert fan and the folding fixed wing.Through the aerodynamic performance analysis of airfoil,the design of the tilting mechanism of ducted fan and the exterior design of the body,the aerodynamic layout design of the new flying car is completed.Secondly,on the basis of understanding the knowledge of numerical simulation method to solve the hydrodynamics problem,through the blade element theory derivation and CFD numerical simulation,this paper analyzes the aerodynamic performance of the coaxial two blade ducted fan,and compares it with the aerodynamic performance of the isolated two blade ducted fan,and confirms that compared with the isolated two blade,the aerodynamic performance of the coaxial two blade ducted fan has obvious advantages.Then,the numerical simulation of the external flow field of the flying car wing at different angles of attack is carried out,and the pressure distribution of the wing at the maximum speed of the flying car is determined,and the favorable angle of attack of the flying car is preliminarily determined.Then,the whole flow field of the flying car is simulated and analyzed.Based on the analysis of the pressure nephogram of the flow field outside the vehicle body at different angles of attack,the outflow field characteristics of the flying car body at different attitudes are understood,and the overall flying angle of attack of the flying car is determined,which is also consistent with the favorable angle of attack of the wing mentioned above.Finally,the finite element analysis of the wing structure of the flying car is carried out by using workbench.Through the design of the wing structure and the simplification of the model,the static strength of the wing is calculated based on the pressure distribution data of the wing structure.The strength of the skin connection of the wing was checked by riveting test.The results show that the strength of wing skin structure can meet the maximum stress-strain requirements.The modal analysis of the wing structure is carried out to determine the natural vibration mode and frequency of the wing of the flying car.Through the above research,the flow field characteristics of the new flying vehicle in the forward flight state are preliminarily determined,which is conducive to improving its overall control stability.At the same time,the safety of the wing structure of the flying vehicle under the corresponding working conditions is mastered to a certain extent,which provides a reference for further research and optimization of the wing structure. |
