deliverable: interim design november 9, 2010 team # 3 erica cosmutto hunter metzger joel ware...
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INTEGRATION OF EXPERIMENTAL
PROPULSION SYSTEMS IN
MICRO AIR VEHICLES
Deliverable: Interim DesignNovember 9, 2010
Team # 3
Erica Cosmutto
Hunter Metzger
Joel Ware
Kristina De Armas
Michael Isaza
Santiago 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 Weight
EDF $129.95 .862 lbs
Battery $509.99 2.05 lbs
Battery Charger $109.98
Woodworks LipoSack (Storage)
$34.99
ESC $120.00 .242 lbs
Transmitter/ 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 2.2kg
Thrust 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
m
s Ideal Velocity capable from fan
electric 0.85 electric power to shaft output
Vexit electric Vel
Vexit 52.478m
s 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
Afan
Dfan
2
2
Ahub
Dhub
2
2
FSA Afan Ahub
FSA 3.641 103 m
2 FSA 5.643in2
Aexit FSA 0.75
Aexit 2.731 103 m
2 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
Aw
Aellipse
2
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 area
A2 AexitD1 76mm
V1 VexitA1
D1
2
2
A1 7.032in2
A1 4.536 103 m
2
V1 A1 V2 A2
V2
V1 A1
A2
V2 87.185m
s *Velocity of air leaving fuselage with this geometry, if in a vaccum, at full
power, neglecting all friction and resistance.
More Realistically Closer to V.exit.
Vexit 52.478m
s