Abstract
Aimed at determining the ground effect’s influence on the process of ultralow-altitude airdrop, this article studies the corresponding changes in aerodynamic characteristics caused by the ground effect. Through analyzing the longitudinal long- and short-period modes and the lateral mode, this work evaluates the impact that the ground effect has on the level-off and the traction stages during an airdrop mission, with reference to corresponding flight quality standards. Accordingly, these findings provide a reference for the design of flight control regarding airdrop capabilities and support a theory for corresponding ground experiments.
Highlights
Ultralow-altitude airdrop and its main utilization for precise delivery of heavy equipment to desired regions are a focus and a critical difficulty for the airdrop field.[1]
This article studies the influence of the ground effect on task performance, which is an important component in general airdrop theory
The result shows that the ground effect has significant influence on the longitudinal longperiod flight quality of the carrier
Summary
Ultralow-altitude airdrop and its main utilization for precise delivery of heavy equipment to desired regions are a focus and a critical difficulty for the airdrop field.[1]. International research on the ground effect has mainly concentrated on the theoretical calculation of aerodynamic forces[10,11,12] and flight stability analysis near the ground.[13,14,15] Ouyang and Liu and Yue et al studied the lateral flight quality and stability of the aircraft during the ultralow-altitude airdrop process, while considering the ground effect.[16,17] Lee clarifies that the ground effect mainly alters air flow at the wings and the horizontal tail, thereby changing the longitudinal dynamic stability of the carrier.[18] Sun and Dai studied the influence of wing tip sails on the flow fields and aerodynamics of a wing in ground effect.[19] He et al analyzed the aerodynamic characteristics of the. The change mechanism of aerodynamic characteristics of airdrop carrier under the influence of ground effect is studied and the flight quality index of height mode is proposed On this basis, this analysis reveals the ground effect’s impact on task performance during the level-off and traction stages of ultralow-altitude airdrop. During low-altitude flight, the influence of the ground effect on the aircraft’s longitudinal aerodynamic characteristics and moment is mainly composed of three parts: the change in the lift coefficient caused by the free- and boundvortexes, the lift of the horizontal tail, and the change in downwash angle
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