Aerodynamic Design of VTOL MAV
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1 Aerodynamic Design of VTOL MAV Sergey Shkarayev The University of Arizona, Tucson, AZ, USA Jean-Marc Moschetta and Boris Bataille SUPAERO, Toulouse, France This work is sponsored by AFRL, Eglin AFB and by EOARD, London September 17, 27
2 Outline Mission and performance requirements for VTOL MAV Teaming Propulsion system of two coaxial contra-rotating motors-propellers Propulsion evaluation Wind tunnel apparatus and test procedure Zimmermann wing testing at UA and SUPAERO Decoupling of aerodynamic and propulsive forces Zero-lift Drag VTOL MAV design and flight tests
3 Aerodynamic designing of VTOL MAVs Goals (overall three-year goal): Project brings together a team of experts from UA and SUPAERO Conduction of experimental and theoretical research studies on the most important aspects of aerodynamics, structure, stability and automatic controls of VTOL MAVs Mission Designing and flight testing of autonomous VTOL MAVs Research studies
4 Mission and Performance Requirements Urban operation scenario Rapid ingress/egress Vertical take-off and landing Hovering High maneuverability in tight space, flying into windows and inside of buildings
5 Previous Relevant Work SUPAERO Vertigo VTOL UAV System - Tail-Sitter Span 65 mm - In-line Propellers - Control obtained by flow deflection Hover: large diameter of propeller Fast forward flight: large surface of wing Conception and realization : Aerospace Laboratory, SUPAERO Aerodynamics characterization : Aerodynamic Laboratory, SUPAERO
6 Previous Relevant Work UA Autonomous MAV System Dragonfly - Endurance of 3 min mph - Operate in winds of 25 mph - Standard operational altitude of 3 ft AGL - Low noise and visual signature - GPS waypoint navigation system - Hand launch, autonomous climb, fly trough waypoints, return and land at last waypoint - Allow for between flight and in-flight reprogramming In March of 26, the Dragonfly UA MAV was delivered to the US Army
7 VTOL MAV Concepts to be Studied Single- and dual-propeller tilt-body MAV Concept Tilt-wing MAV Concept Thrust-vectoring MAV Concept Single propeller propulsive system drawbacks: propeller torque P-factor effect of the rotational airflow gyroscopic moments
8 Propulsion system of two coaxial contra-rotating motors-propellers two propeller-motor sets, one directly behind the other in the axial direction, spinning in opposite directions space inside a stator allows a cross shaft through a motor no gear box needed
9 T (N) Propulsion Evaluation tractor P (W) pusher single vs dual no gains, no losses pusher vs tractor a significant form drag on tractor configuration 1 times lesser torque
10 Hot Wire Measurements 8 8 S2 T= S1 S2 S3 7 6 S2 T=15 Tractor 5 5 z (mm) 4 z (mm) V (m/s) V (m/s) velocity distributions fuselage, wing, and controls design for vertical flight conditions
11 z (mm) z (mm) Propeller momentum theory R r Theory T = 1.47 N Theory T = 2.45 N Experiment T = 1.47 N Experiment T = 2.45 N Velocity at the distance s from the propeller disk 2 T s / R w( s).5 V 1 V R 1 ( s/ R) The radius of the streamtube V ( s) r V() R V (m/s) V (m/s)
12 Wind Tunnel Facilities SUPAERO Wind Tunnel UA Wind Tunnel suction-based, open circuit tunnel with a test section of.9 x 1.2 m is capable of speeds from 2 to 5 m/s 6 -component balance closed circuit tunnel with a test section of.45 x.45 m capable of speeds from 2 to 3 m/s 6-component high precision balance
13 T, N Wind Tunnel Testing of Propulsion % 65% 6% 55% Thrust Required.5 PWM V, m/s
14 Wind Tunnel Model of Zimmermann Wing Camber (%) 3 Wing Span, b (in) 1 Root Chord Length, c (in) Camber Height, h (in).27 Thickness, t (in).2 Max Reflex Position, d (in) Wing Area, S (in 2 ) 6 Inverse Camber, h i (in).94 t =.25%; h i / h = 1/3
15 Zimmermann Wing Testing at UA and SUPAERO Re = 1, Re = 1, Cd vs Alfa UA CD vs Alfa SUPAERO Cl vs Alfa UA CL vs Alfa SUPAERO
16 Effects of Motor-induced Flow on Aerodynamic Coefficients PWM = 55%, Re = 1, CL Wing Cl vs Alfa UA Wing+motor CL vs Alfa after AOA streamline corrections CD Wing Cd vs Alfa UA Wing+motor CD vs Alfa after streamline curvature corrections AOA (deg) AOA (deg)
17 D, N Zero-lift Drag due to Prop Wash and Free Stream % % 6% 55% PWM V, m/s
18 Zero-lift Drag due to Prop Wash and Free Stream Propeller induced velocity at the distance s from the propeller disk 2 T s / R w( s).5 V 1 V R 1 ( s/ R) Ultimate Velocity 2T wult w( s ) V V R 2 2 Total Drag D ult p D C S V w S S V Zero-lift drag coefficient C D.5 D 2 2 ult p S V w S S V
19 Zero-lift Drag Coefficient in the Presence of Prop Wash and Free Stream.8.6 C D.4.2 C D.35.24w ult w ult, m/s
20 T, N Designing VTOL MAV to Hovering and Vertical Flight Force balance in vertical direction T W D Thrust required 2 2T 2 2 2T 2 T W V V 2 S V S 2 S p V R R % 65% 6% 55% Thrust Required.5 PWM V, m/s
21 VTOL MAV Design and Flight Testing MAV specifications. Value Parameter Wingspan (cm) 3 Length (cm) 2 Wing area (cm 2 ) 488 Elevon area (cm 2 ) 6 Fin area (cm 2 ) 47 Rudder area (cm 2 ) 3 Weight (g) 185 Endurance (min) ~2 Speed (m/s) -2
22 Conclusions 1. In the present study, a tilt-body, tail-sitter concept for VTOL MAVs was analyzed and a novel design was proposed based on the contra-rotating propeller-motor electric propulsion system. 2. The maximum torque for the contra-rotating system was about 1 times lower than a torque measured on a single propeller-motor system. The pusher arrangement of the propeller generates 2-23% more thrust force than the tractor for the same inputted power. 3. The fluctuations in slipstream velocities in terms of a standard deviation were determined. They are indicative of non-stationary, pulsating flow behind the propellers. The results also explain the overall decrease of a thrust force for the tractor arrangement in comparison with the pusher one.
23 Conclusions (cont.) The aerodynamics of a wing-propeller combination was studied through wind tunnel measurements. The drag on the wing is generated from two mixing airflows: free stream and propeller slipstream. A simplified model for the flow similar to the one used in the classical propeller momentum theory is introduced in the present study, and a formula for the drag coefficient for the wing in the presence of a free stream and slipstream is derived. The drag coefficient increases three times, with induced speed increasing from to 15 m/sec. This result indicates the change of transition mechanism in the boundary layer from a laminar to a turbulent state, which deserves further study. The results obtained in the present study were realized in a design of a VTOL MAV prototype that was successfully flight tested.
24 Derivation of Aerodynamic Coefficients Recalculated wing aerodynamics: L D M wing wing wing L D c / 4 L T prop prop M M prop Wing aerodynamic coefficients: Propeller effects: L, T prop prop M prop d sin d T dyn a c tan 4 C L C D C M L wing qs D c/4 wing qs M wing c /4 qsc
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