Airframe Design Of Hypersonic Integrated Vehicle

The design method of hypersonic vehicle airframe was built based on theoretical analysis, numerical simulation and optimization.Flow field structure and feature of two-dimensional flow path were discussed by using theoretical and numerical analysis thus design principles of forebody/inlet and aftbody/nozzle integrated configurations were obtained. A parametric model of two-dimensional airframe was built and influences of parameters were discussed. The performance of inlet starting, nozzle thrust, pitch moment and aerodynamic forces during the flight were analysed and a response surface method (RSM) was introduced for optimization of the airframe..A three dimensional integrated vehicle configuration was developed based on the dimensional airframe design. To avoid the spillage at side edges of forebody, wedge shaped side edges were added on the side of the vehicle central flow path to make a basic integrated vehicle configuration. The aerodynamic characteristics of the vehicle were discussed by numerical simulation and a RSM is built for optimization. A design environment was made up involving modules of airframe generation, visualization, aerodynamic analysis and optimization.Waverider shaped side edges were designed to be integrated with the central flow path. Cone derived waveriders designed at variable Mach numbers are proved efficient to avoid side spillage of the central flow path. A aerodynamic prediction method was used for optimization. Waverider configurations with blunt nose were developed to avoid the aerothermal challenge at the sharp edges. Blunt edges greatly changed the structures of flow fields and the lift to drag ratio decreased when the blunt edges scale increased. A waverider configuration with partly blunt edges was developed and proved to be better at lift to drag ratio.A powered integrated vehicle model was designed for aerodynamic tests in a hypersonic wind tunnel. A series tests were conducted to measure the aerodynamic characteristics of the model during the progress from inlet close to the ignition of the engine. The basic aerodynamic performance and were obtained by the tests. To improve the performance of the vehicle, a waverider shaped side edges were designed to form a new model. Results of the tests showed that the new model create higher lift to drag ratio and the longitudinal static-stability.