Integration of experimental propulsion systems in micro air vehicles
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Transcript of Integration of experimental propulsion systems in micro air vehicles
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INTEGRATION OF EXPERIMENTAL
PROPULSION SYSTEMS IN
MICRO AIR VEHICLES
Deliverable: Interim DesignNovember 9, 2010
Team # 3Erica CosmuttoHunter Metzger
Joel WareKristina De Armas
Michael IsazaSantiago Baus
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OVERVIEW Introduction EDF vs Propeller Final Component Selection IE Update Calculated Values Designs Center of Gravity Cost and Weight Analysis Conclusion Future Work
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INTRODUCTION Integrate an electric ducted fan into the
fuselage of a Micro Air Vehicle (MAV) Focus on:
Fuselage designAir Flow Inlet/Duct design Integrating electronics and fan into the
fuselage Constraints:
10 lb max6 in diameter32 in length
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EDF VS PROPELLER FAN Duct reduces losses in thrust caused by
tip vortices The Ducted fan operated at higher
velocity EDF has a smaller diameter EDFs are quieter and safer
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FINAL COMPONENT SELECTION
76mm ID, 80mm OD22.2V391g55A
$129.50
TP8000-6S4PL22.2V8000mAh16C
$509.99
Smart Guide ESCUp to 44.4V100A
$120.00
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IE UPDATE Lean Six Sigma Methodology
DMAIC process Define Phase Complete Measure Phase due November 30th
Define performance standardsEstablish data collection planValidate the measurement systemCollect necessary data from existing system
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VALUES CALCULATED Maximum Thrust of 2.2 kg =21.6 N Ideal Inlet Area= 5.643 in2 (FSA, Fan Sweep
Area) Ideal Exit Area=4.3 in2 (75% of FSA) Maximum Velocity Exiting Fan=52.478 m/s
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DESIGN 1
Design specified by sponsor Intake from the bottom of the MAV
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DESIGN 2
Intake on top and bottom Laminar flow off top surface
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DESIGN 3
Maximize flow intake Simple design
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DESIGN 4
Uses two side ducts Smooth intake of air
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CENTER OF GRAVITY
ESC110g Battery
932gFuselage3084g
Fan391g
Desired
CG
CurrentCG
1.92 in
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COST AND WEIGHT ANALYSISComponent Cost WeightEDF $129.95 .862 lbsBattery $509.99 2.05 lbsBattery Charger $109.98Woodworks LipoSack (Storage)
$34.99
ESC $120.00 .242 lbsTransmitter/ Receiver
$179.97 .033 lbs
Industrial Strength Velcro
$7.00
TOTAL $1091.88 3.187 lbs
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CONCLUSION Four fuselage designs Initial Calculations and Analysis Calculated Ideal Inlet and Outlet Areas Center of Gravity Analysis Final Component Selection The team has started work at HPMI
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FUTURE WORK Continue work at HPMI Produce the first mold Receive Components Testing in Comsol and wind tunnels Measurement of Existing Model
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REFERENCES Hobbypartz.com Thunderpowerrc.com Hobbytown.com “The Calculation and Design of Ducted
Fans”.Wattflyer.com www2.nlr.nl/public/facilities/AVET-Info/
Content/UK/PropBlades.html www.sterndrive.info/
400_800_cobra_propellers.html
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Calculations:
Given Thrust of 2.2kgThrust 2.2kg g
Thrust 21.575N
Power calculations:
I 60A Volt 22.2V Assuming 100% efficient
P I Volt P 1.332 103 W
Velocity Calculations:
Thrust mdot Vel
P Thrust Vel
VelP
Thrust Vel 61.739
ms
Ideal Velocity capable from fan
electric 0.85 electric power to shaft output
Vexit electric Vel
Vexit 52.478ms
Velocity of air leaving fan
Exit Area Calculations:
As a rule when working with EDFs the exit area of the flow needs to be 70-85% of the FanSwept Area(FSA). For these calculation we use 75%.
Dfan 76mm Dhub 33.77mm
AfanDfan2
2
AhubDhub2
2
FSA Afan Ahub
FSA 3.641 10 3 m2 FSA 5.643in2
Aexit FSA 0.75
Aexit 2.731 10 3 m2 Aexit 4.232in2
Dexit 4Aexit
Dexit 2.321in Dexit mm
Calculations:
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Inlet Area Calculations:
Ideally the inlet area would equal the Fan swept area. An ellipse would be the best intake areabecause it is very aerodynamic shape. Aellipse FSA
Aellipse Aw Bl
Bl 2 Aw
Aellipse 2 Aw2
AwAellipse2
Aw 0.948in Bl 2 Aw Bl 1.895in
need an ellipse with a major axis of 3.79 in and a minor axis of 1.895 in, giving us 99.96% ofFSA for an inlet area.
Velocity Exiting Duct*:
To find the velocity at the end of this duct use mass conservation:
A1=area right after fan A2=exit areaA2 AexitD1 76mm
V1 VexitA1D12
2
A1 7.032in2 A1 4.536 10 3 m2
V1 A1 V2 A2
V2V1 A1
A2
V2 87.185ms
*Velocity of air leaving fuselage with this geometry, if in a vaccum, at fullpower, neglecting all friction and resistance.
More Realistically Closer to V.exit.
Vexit 52.478ms