| Hypersonic vehicles refer to aircraft,missiles,shells and other winged or wingless vehicles with a flight speed of more than five times the speed of sound.Because of their fast flight speed,strong mobility,long range and strong penetration ability,hypersonic vehicles have become the focus of the strategic and tactical competition of the world’s aerospace powers.This paper takes the aerodynamic shape of American AHW boost gliding hypersonic vehicle as the research object.The main work is as follows:Firstly,the geometric shape related to the optimal design of AHW hypersonic vehicle is modeled parametrically.According to the third-order Bezier curve,the shape curves of different control section positions of the projectile are generated,and then the three-dimensional shape of the projectile is obtained by the method of die line design.For the three-dimensional modeling of AHW strake wing and flap,according to the relevant data,the three-dimensional shape is generated by die line design.Finally,the three-dimensional shape of the vehicle with flap is generated by the combination of the missile body,strake wing and flap,that is,AHW analog boost gliding vehicle.Secondly,in the preliminary analysis of AHW analog boost gliding hypersonic vehicle,firstly,the orthogonal experiment is used to analyze the key design variables of the vehicle,and the influence degree of different design variables on the key aerodynamic characteristics of the vehicle is obtained.The influence of key design variables on the aerodynamic characteristics of the vehicle is further optimized and analyzed by multi-objective genetic algorithm,and several kinds of better missile shapes are selected.Then,the hypersonic vehicle is arranged according to the circular section of the United States.The key aerodynamic characteristics such as lift drag ratio and pressure center are analyzed.For the vehicle with flap,this paper gives the cross layout and × layout.There are two layout modes of word layout,focusing on the trim efficiency of pitch and yaw direction under the condition of setting the position of center of mass and the size of flap surface.The rolling torque characteristics of circular section layout under the condition of pitch control rudder differential are given.The torque characteristics of rudder surface hinge of different position control rudders under cross layout are given.Finally,the way to further improve the aerodynamic performance of American AHW boost gliding vehicle is explored.The effective way to further improve the aerodynamic performance of AHW boost gliding vehicle is to use non-circular section missile body.According to the optimized shell shape,the aerodynamic characteristics such as lift drag ratio and pressure center of non-circular section shell are analyzed.The cross layout of non-circular section vehicle with flap,the trim efficiency of full moving flap and trailing edge flap in pitch direction and yaw direction at a given center of mass and surface size are analyzed.we also analyze The aerodynamic characteristics of the elliptical cross-section ×layout full-motion rudder aircraft.Compared with the analysis results of circular section vehicle with flap,AHW analog non-circular section missile body layout can achieve high trim lift drag ratio,and a reasonable combination of centroid position and flap surface size can achieve better handling requirements than circular section layout.The key to improving performance is non-circular section design. |
