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Implementation of Active Implementation of Active Flow Control using Microjets Flow Control using Microjets on an RC Aircrafton an RC Aircraft
Dan DrakePhil KrethHussein NabulsiMatt Tubtim
Faculty Advisor: Dr. Farrukh AlviSponsor: Dr. Gregg Abate (Eglin AFB)
04.03.2008
BackgroundBackgroundFlow Separation
04.03.2008
Flow separated ~16° AOA Reattached flow ~ 5 psig @ microjets
MotivationMotivation
04.03.2008
Baseline flow
• ONERA D Airfoil• Span = 1 m, Chord = 0.35• U= 45 m/s, = 14 • Control applied to 40% of span
Flow with Control
*Conducted at the Université de Poitiers, France
Images & Video Courtesy of Dr. Farrukh Alvi
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-5 0 5 10 15 20 25 (°)
CL Unforced FlowMicrojets Pressure 0.3 barMicrojets Pressure 1.1 barMicrojets Pressure 1.5 bar
MotivationMotivation
04.03.2008
Images Courtesy of Dr. Farrukh Alvi
20-30% gain in CL
Control applied to 40% of span
Needs AssessmentNeeds AssessmentImplement microjets on RC AirplaneRemotely activate each wingRun time should be 30 secs or moreDelay stall and improve liftUse off-the-shelf items onlyBudget = $1,50000
04.03.2008
Wind Tunnel TestingWind Tunnel Testing
04.03.2008
Paint Testing◦ Uncertainty in interpretation
Smoke Wire◦ Minimum WT speed too high
Tuft Testing◦ Success
Flow Reattachment VideoFlow Reattachment Video
04.03.2008
Air Supply Method
Air Supply Method
Performance Measurements
Final Design Schematic
04.03.2008
Actual Design
04.03.2008
Final Design ComponentsFinal Design ComponentsOverhead View
Close-up view:
Tank
Regulator
Valves
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High Pressure Tank Location
04.03.2008
Shielding for High Pressure Cylinder
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Pressure Manifolds and Microjets in Wing
to microjets
from valves04.03.2008
Added Weight: 10 lbsTotal Weight: 14 lbs
Budget & WeightBudget & Weight
04.03.2008
Test PlanTest PlanVideo aircraft on ground
◦Show all systems in working orderFlight testing, no controlFlight testing, with control
◦Acquire video from on-board camera
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Flight Test GoalsFlight Test GoalsDon’t crash!Demonstrate reattachment
04.03.2008
Flight Test VideoFlight Test Video
04.03.2008
Outcomes & ConclusionsOutcomes & ConclusionsSystem was successful
◦ No “bad landings”◦ Microjets remotely activated◦ Reattached flow demonstrated
Proposed Future Work◦ Demonstrate Roll Control◦ Measure CL and CD improvements
04.03.2008
Special ThanksSpecial ThanksEglin Air Force Base
◦ Dr. Gregg AbateAAPL – FAMU-FSU
◦ Dr. Farrukh AlviMechanical Engineering Dept
◦ Dr. Cesar Luongo◦ Mr. Jon Cloos
04.03.2008
Questions and CommentsQuestions and Comments
04.03.2008
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