Numerical Research On Aeroforce And Aerothermal Characteristic Of Mechanical Deployable Reentry Vehicle

Setting mechanical deployable reentry vehicle as study object,this paper studies the aeroforce and aerothermal characteristic by using numerical simulation methods.The purpose is to acquire a deeper understanding of this newly proposed reentry scheme and provide technical support for its future design and analysis.Firstly,the numerical simulation methods are introduced,which include CFD(Computational fluid dynamics)and DSMC(Direct Simulation Monte Carlo)methods.The software used in this paper is also discussed,in which way lay the foundation for next aeroforce and aerothermal calculation.Secondly,the geometry of the reentry vehicle is explained and the depression of flexible fabric under maximum dynamic pressure condition is studied.Comparison between origin and depressed model are made and the simplified model used in calculation is established.Furthermore,critical technics of hypersonic calculation are discussed and the thermo-chemical non-equilibrium model used in simulation is made clear.Then the flow field under different altitude and angle-of attack in continuum regime is analyzed,as well as lift-to-drag and trim properties by using CFD method.These properties of the vehicle in the rarefied regime are also studied with DSMC method.Drag coefficients of the vehicle range from continuum flow to rarefied regime are discussed based on the above analysis.At last,main factors that influence the heat flux of the vehicle are discussed and thermo-chemical non-equilibrium phenomenon is analyzed,the heat flux and total heat addition of main parts of the vehicle are presented.