City Research Online

Abstract

This work investigates the aerodynamic and pressure sealing performance of the ALFA seal, a novel fixed-leading-edge to main wing-box seal that is designed to maintain laminar flow over the leading edge of a transonic wing. The seal also offers benefits beyond aerodynamics, by simplifying assembly and maintenance through its snap-fit design which eliminates the need for sealants and bonding applications. Wind tunnel experiments were conducted using Laser Doppler Anemometry (LDA) and Schlieren imaging to assess the seal’s impact on the boundary layer and its pressure sealing capabilities. LDA measurements suggest minimal influence of the seal on the flow velocity profile, with consistent turbulence intensity across various Mach numbers. Schlieren visualizations revealed flow disturbances originating from the seal’s leading edge, potentially impacting the downstream flow. This discrepancy highlights the need for further investigation using an extended LDA measurement range and single-plane focused Schlieren imaging techniques. Pressure sealing tests demonstrated the seal’s ability to maintain pressure differentials across the wing, replicating those experienced during flight. Overall, the results are promising for the ALFA seal’s potential as a laminar flow enabler and sealing device for commercial aircraft wings. Further investigation are necessary to fully understand its impact on the boundary layer and optimize its design.

Publication Type:	Conference or Workshop Item (Paper)
Additional Information:	© AIAA 2024.
Subjects:	T Technology > TJ Mechanical engineering and machinery T Technology > TL Motor vehicles. Aeronautics. Astronautics
Departments:	School of Science & Technology School of Science & Technology > Engineering
SWORD Depositor:	Symplectic Administrator

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