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The influence of yaw on the unsteady surface pressures over a two-wheeled landing-gear model

Published version
Peer-reviewed

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Abstract

Landing-gear noise is an increasing issue for transport aircraft. A key determinant of the phenomenon is the surface pressure field. Previous studies have described this field when the oncoming flow is perfectly aligned with the gear. In practice, there may be a cross-flow component; here its influence is investigated experimentally for a generic, two-wheel, landing-gear model. It is found that yaw angles as small as 5{\deg} cause significant changes in both overall flow topology and unsteady surface pressures. Most notably, on the outboard face of the leeward wheel, large-scale separation replaces predominantly attached flow behind a leading-edge separation bubble. The effect on unsteady surface pressures includes marked shifts in the content at frequencies in the audible range, implying that yaw is an important parameter for landing-gear noise, and that purely unyawed studies may not be fully representative of the problem.

Description

Keywords

unsteady flow, surface pressure, landing-gear flow, landing-gear noise, bluff-body

Journal Title

Conference Name

Journal ISSN

0954-4100
2041-3025

Volume Title

Publisher

SAGE Publications