Unsteady Aerodynamic Response of Rigid Wings in Gust Encounters
Abstract
Many modern air vehicle operations are currently limited by operational envelopes restricted to ensure vehicle safety and performance in highly unsteady aerodynamic environments. Surveillance, reconnaissance, pickups and deliveries, and search and rescue may all take place in complex terrain, airwakes, and severe weather, and are currently restricted to benign flow disturbances and conservative operational envelopes. AVT-282 aimed to extent the state of the art in unsteady lift modeling and prediction in support of the development of robust flight vehicle performance where wind gusts are of the same order of magnitude as the vehicles flight speed, and where disturbance rejection may be achieved via closed-loop flow control. Several types of canonical large-amplitude gusts were studied, and similar lift responses were found for transverse, vortex, and streamwise gust encounters. Lift was found to be a direct result of flow separation and the subsequent formation of strong vortices, with an additional contribution from the free vorticity in the gust flow itself. Linear inviscid theories were found to provide reasonable predictions of lift response for gusts much larger than intended but failed in extreme cases. Stronger gusts resulted in stronger force transients and longer recovery times.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 2020
- Accession Number
- AD1183649
Entities
People
- Albert Medina
- Alex Moushegian
- Amanda Grubb
- Amanda Smyth
- Anna Young
- Anya R. Jones
- Arif C Gozukara
- Berk Zaloglu
- Cameron Smith
- Daniel Heathcote
- David E. Rival
- David R. Williams
- Girguis Sedky
- Guosheng He
- Holger Babinsky
- Huansheng Chen
- Hulya Biler
- Ignacio Andreu-angulo
- Johannes Pohl
- Juhi Chowdhury
- Julian Deparday
- Justin W Jaworski
- Karen Mulleners
- M Moriche
- Manuel Garcia-villalba
- Marilyn Smith
- Matthew Marzanek
- Matthew Ringuette
- Murat Saritas
- O. Flores
- Oksan Cetiner-yildirim
- Pascal Gehlert
- Richard Semaan
- Sabrina Henne
Organizations
- Istanbul Technical University
- NATO Science and Technology Organization
- University of Maryland