Abstract:During the landing phase of a carrier-based fixed-wing unmanned aerial vehicle (UAV), the aircraft must traverse a highly complex aerodynamic environment characterized by the intricate wind field over the sea surface and the turbulent flow field at the ship"s stern, the latter being significantly affected by the superposition of the ship"s multi-degree-of-freedom motion. A comprehensive evaluation of these aerodynamic and flow field characteristics is essential for the development and implementation of robust control strategies to ensure the safe and precise landing of carrier-based aircraft. In this paper, the complex ship/deck flow field and unsteady aerodynamic characteristics of carrier-based unmanned aerial vehicle (UAV) landing process under sea wind field are numerically simulated. A high-fidelity simulation model of the flow field/aerodynamic during the landing process of carrier-based UAV is established, which includes sea wind field, ship motion mode, landing trajectory of carrier-based UAV and dynamic overset grid technology. The dynamic flow field of ship/deck and unsteady aerodynamic characteristics of carrier-based UAV in stationary and moving state are analyzed. The results show that: The velocity distribution in the W direction on the landing trajectory of the carrier-based aircraft is typical "Rooster Wake", and the vertical cutting velocity is very obvious; the maximum vertical velocity variation of the flow field is close to 12m/s due to the coupled motion of ship pitch/heave mode; The aerodynamic characteristics of UAV in the process of landing are strongly unsteady, and the lift coefficient shows a trend of first increasing and then decreasing.
