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Activity title

Large-Amplitude Gust Mitigation Strategies for Rigid Wings

Activity Reference

AVT-347

Panel

Applied Vehicle Technology

Security Classification

NATO UNCLASSIFIED

Status

Proposed

Activity type

RTG

Start date

2021

End date

2023

Keywords

airwakes, control, fluid dynamics, gusts, Unsteady aerodynamics

Background

Previous work under several AVT groups has provided a basic understanding of unsteady aerodynamics in the context of a manoeuvring air vehicle. Most recently, AVT-282 formulated a working definition and categorization of large-amplitude gusts, defined as an unsteady variation in the local flow velocity of the same order of magnitude as the flight speed. New types of experiments, numerical methods, and analytical models were established to study the effect of gusts on the fundamental aerodynamics, handling, and control of an air vehicle in unsteady flight environments. Results of this work have shown that while there are some similarities between the manoeuvring aircraft problem and the gust encounter problem, there are also important fundamental differences in the flow physics and therefore in the aerodynamic response and likely in the most suitable gust mitigation strategies.

Objectives

The Technical Team’s work plan consists of: - Application and extension of classical theories and analytical models to highly separated flows. - Determination of the most promising control methods for large-amplitude gust encounters. - Integration of flow models into closed-loop control algorithms for the mitigation of undesirable aerodynamic responses in gust encounters. The expected deliverable is an archival Final Report as well as an array of journal and conference publications authored by group members. The Technical Team will serve for the usual 3-year duration of RTO Task Groups.

Topics

The proposed Task Group will study fluid mechanics, mechanisms of flow control, closed-loop control, and fluid-structure interaction towards the development of new gust mitigation strategies.

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