Simulation and Analysis of Aerodynamic External Flow Field Environment for the Scramjet-Propelled Hypersonic Vehicle
This study addresses the current gap in predicting the aerodynamic environment encountered by scramjet-propelled hypersonic vehicles during flight. Correlation analyses between key simulation parameters and numerical accuracy were conducted based on wind tunnel date. Based on these insights, an optimized aerodynamic environment simulation scheme is proposed. The predicted aero-acoustic, vibrational, and thermal conditions are shown to be extreme, with values reaching 147 dB, 182 g, and 2130 K, respectively. During structural design, the airfoil leading edge directly faces more intense aerodynamic heating and therefore requires materials with excellent heat resistance. Vibration-resistant design should prioritize the airfoil trailing edge. Adopting new high-performance materials like Inconel alloys significantly enhances structural reliability and durability. In environmental testing, the test scope must comprehensively cover the extreme limits of the aforementioned aerodynamic conditions, with thermal tests requiring a rapid temperature rise rate of 83°C/s to simulate thermal stresses under extreme flight conditions. Furthermore, as flow velocity increases, the impact of aerodynamic heating on structural vibrations becomes more pronounced, further validating the critical importance of combined thermal-vibration testing.