Aerodynamic modeling for hypersonic flight vehicles with account of scramjet effects

摘要

This paper focused on the aerodynamic modeling for hypersonic flight vehicles, taking into account the scramjet effects on aerodynamics. A methodology was proposed for aerodynamic modeling in this case. First, aerodynamic models were identified at each Mach number with the scramjet engine off. Then, the differences between aerodynamics with engine on and those with engine off were modeled to describe the scramjet effects on aerodynamics. Stepwise regression was applied to determine model structures and model parameters were estimated by using the least squares method. The flight simulation platform was constructed by applying the aerodynamic database to conduct flight tests. Multi-sine and multi-step inputs were designed for control surface perturbations to perform specific maneuvers to excite the hypersonic vehicle sufficiently. Simulation results were presented to demonstrate the validity of the proposed aerodynamic models.