The Woodruff School

SUMMARY

Variable aerodynamic load distributions that would be effected in flight by interactions between wing surfaces and the embedding flow by surface-integrated and regulated distributed active bleed driven through the wing by pressure differences between its pressure and suction surfaces can enable adaptive, lightweight, and agile deformable wings. The use of bleed actuation for aeroelastic control for morphing the wing shape is new and represents a significant departure from earlier approaches that have relied on either internal mechanical deformation or external control surfaces. Thereby, the distributed bleed approach obviates the need for complex mechanical or electromechanical actuators that suffer from significant limitations in terms of power, weight, and response time.

In the present investigations, the aerodynamic loads effected by controlled interactions between active distributed aerodynamic bleed on a 3-D flexible wing model and the embedding cross flow are explored in wind tunnel investigations for realizing tunable aeroelastic characteristics. These investigations have demonstrated controlled regulation of the wing’s aerodynamic loads and its structural characteristics and that feedback-controlled, bleed-induced loads can be used for effective suppression of structural vibrations. The effects of the bleed on spanwise distributions of the sectional circulation and aerodynamic loads during vibration control are assessed using time-dependent measurements of the flow evolution in the wing’s near-wake by high-speed stereo PIV. These measurements demonstrated that the control effectiveness of the actuation stems from rapid changes (within 3-4 convective time scales) in the bleed-induced sectional circulation and thereby in the distributed loads.

Teams Meeting link:
https://teams.microsoft.com/l/meetup-join/19%3ameeting_YzM3NmU3YjctYTg3ZC00NGI5LTliNTgtNzk4YmU4YjE3MDNk%40thread.v2/0?context=%7b%22Tid%22%3a%22482198bb-ae7b-4b25-8b7a-6d7f32faa083%22%2c%22Oid%22%3a%22bb73a3da-0d3e-40f2-9ab1-f666ce3a5f9c%22%7d

SUBJECT:	Ph.D. Proposal Presentation

BY:	Gabriel Peyredieu Du Charlat

TIME:	Friday, June 30, 2023, 10:00 a.m.

PLACE:	Love Building, 295

TITLE:	Flow-Interactive Control of a Flexible Wing using Distributed Bleed Actuation

COMMITTEE:	Prof. Ari Glezer, Chair (ME) Prof. Alexander Alexeev (ME) Dr. Bojan Vukasinovic (ME) Prof. Mark Francis Costello (AE) Prof. Massimo Ruzzene (ME (University of Colorado Boulder))

SUMMARY Variable aerodynamic load distributions that would be effected in flight by interactions between wing surfaces and the embedding flow by surface-integrated and regulated distributed active bleed driven through the wing by pressure differences between its pressure and suction surfaces can enable adaptive, lightweight, and agile deformable wings. The use of bleed actuation for aeroelastic control for morphing the wing shape is new and represents a significant departure from earlier approaches that have relied on either internal mechanical deformation or external control surfaces. Thereby, the distributed bleed approach obviates the need for complex mechanical or electromechanical actuators that suffer from significant limitations in terms of power, weight, and response time. In the present investigations, the aerodynamic loads effected by controlled interactions between active distributed aerodynamic bleed on a 3-D flexible wing model and the embedding cross flow are explored in wind tunnel investigations for realizing tunable aeroelastic characteristics. These investigations have demonstrated controlled regulation of the wing’s aerodynamic loads and its structural characteristics and that feedback-controlled, bleed-induced loads can be used for effective suppression of structural vibrations. The effects of the bleed on spanwise distributions of the sectional circulation and aerodynamic loads during vibration control are assessed using time-dependent measurements of the flow evolution in the wing’s near-wake by high-speed stereo PIV. These measurements demonstrated that the control effectiveness of the actuation stems from rapid changes (within 3-4 convective time scales) in the bleed-induced sectional circulation and thereby in the distributed loads. Teams Meeting link: https://teams.microsoft.com/l/meetup-join/19%3ameeting_YzM3NmU3YjctYTg3ZC00NGI5LTliNTgtNzk4YmU4YjE3MDNk%40thread.v2/0?context=%7b%22Tid%22%3a%22482198bb-ae7b-4b25-8b7a-6d7f32faa083%22%2c%22Oid%22%3a%22bb73a3da-0d3e-40f2-9ab1-f666ce3a5f9c%22%7d