高超声速运载器宽速域气动/推进耦合建模与分析

The further investigation was required to meet the wide speed range model requirement of the airbreathing hypersonic vehicle in preliminary design phase. A wide speed range aerodynamic model for distributions of pressure and friction on the surface of vehicle, which was independent of the vehicle concept, was established based on the streamline tracing technique and the hypersonic aerodynamic theories. A wide speed range dual-mode scramjet model including boundary layer and transonic characteristics was established on the basis of quasi-one-dimensional flow theory. The errors between models and experiments less than 2% and 3% were achieved for the typical cases, respectively. The coupling/decoupling strategies of forebody/inlet and after body/nozzle forces were presented and a wide speed range aerodynamics/propulsion integrated coupling model and platform was built, based on the established models. An analysis of wide speed range aerodynamics/propulsion coupling characteristics of a typical airbreathing hypersonic vehicle was carried out, and severe nonlinear aerodynamics/propulsion coupling characteristics were observed for the integrated designed airbreathing hypersonic vehicle. The results of analysis agreed that the coupling model established could be used to evaluate the aerodynamics/propulsion coupling characteristics, qualitatively and quantitatively, under a satisfying accuracy requirement, and also helpful for the design, simulation and control research of airbreathing hypersonic vehicle.