Closed-loop flow control of the roll and yaw oscillations of a free‑suspended cylinder at low reynolds numbers

A. Hillier, O. Friedland, A. Seifert

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Helicopters carrying slung loads are plagued by problems in flight stability at moderate speeds due to slung load oscillations. The unstable oscillations translate to mission trade-offs and therefore are of interest to overcome. Active flow control technology presents a unique ability to create the necessary aerodynamic stability at low cost, weight, complexity, energy and size. This study is focused on reducing the natural oscillations of a scaled model of a cylindrical slung load suspended in a wind tunnel with fixed anchor point. The research employs Fluidic-piezo-electric actuators to accomplish the stated objective. Previous, recent research in this area by our group has focused on characterizing slung load dynamics and reducing the yaw oscillations. The current follow on study expands this to encompass both yaw and roll swinging motion. The oscillation characteristics are compared with a spectrum of closed-loop control configurations. Each configuration commands the actuators to induce fluidic excitation through two miniature openings at the cylinder summit near the side-edges of the finite span cylinder as well as four additional opening near the leading and trailing edge of the cylinder side-caps. The experiments demonstrate the feasibility of the current flow control approach presents detailed data and discusses the utility of the technology to solve real world challenges. Future research and application path are also discussed.

Original languageEnglish
Title of host publication8th AIAA Flow Control Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624104329
StatePublished - 2016
Event8th AIAA Flow Control Conference, 2016 - Washington, United States
Duration: 13 Jun 201617 Jun 2016

Publication series

Name8th AIAA Flow Control Conference


Conference8th AIAA Flow Control Conference, 2016
Country/TerritoryUnited States


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