Transcript Product Design Review

Concept Design Review
Group C4: Turbinator Technologies
April 22nd and 24th, 2008
Bryan Delaney, Robert Herzog, John Larson,
Michael O’Brien, and Alex Vossler
Turbinator Technologies
Purpose

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Portable source of power
(20 W at 12 V for an
average wind of 15 mph)
Disaster relief
– Power a radio, phone and/or
light
– Reusable
– Inexpensive

Other Applications
Turbinator Technologies
Concept Design Requirements
Requirement
Performance
Size (Travel Size)
Weight
Cost
Package Drop Height
Number of Tools for Assembly
Time for Assembly (2 people)
Number of People to Assemble
Quantity
20 W at 12 V for an average wind
speed of 15mph
4 ft x 2 ft x 2 ft
50 lbs
$500
20 ft
2
1 hour
2
Turbinator Technologies
Concept
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3 Blade Horizontal
Wind Turbine
– 50% more efficient
than vertical wind
turbine
– Smaller and more
portable than a
vertical wind turbine
Turbinator Technologies
Weight
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Rationale: One person can carry on
back
Entire system weighs 47.8 lbs
Turbinator Technologies
Size
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4 Primary
Subsystems
–
–
–
–
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Nacelle
Blades
Poles
Base
No piece longer
than 30”
Turbinator Technologies
Turbinator Technologies
Tip-Over Prevention
 Trade Study Results
 User-supplied weight

Two 60 lbs sandbags
 Withstand > 28 lbf


Expected at 30 mph
Trade Study Results
 Prototype - Withstood 28 mph gusts
 Ratchet straps for triangulation
Turbinator Technologies
Electrodynamic Brake
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User-operated “kill” switch
Shorts generator across terminals
Prevents potential injury and device
failure
Turbinator Technologies
Mechanical Brake
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Band brake actuated by DC motor
Prototype – push button activated
Generator limited to 3A continuous duty
– Turbine limited to
900 RPM

Ensures safety
Turbinator Technologies
Band Brake Operation
Turbinator Technologies
Blade Design
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Modified Blade Element Theory
– Assumes axial induction
factors to be negligible
Power:
Thrust:
Blade Element Geometry
Turbinator Technologies
Power vs. Blade Radius @ 15 mph wind
Turbinator Technologies
Blade Design Decisions
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E387 Airfoil profile
24” radius Blades
Twist 16.7o
from root to tip
Cord taper from
4” at root to 1” at tip
Source: National Renewable
Energy Laboratory
Turbinator Technologies
Blade Development
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PVC
Foam and
Fiberglass
Outsource Air-X
Carbon Fiber Blades
Turbinator Technologies
Performance Testing
Turbinator Technologies
Prototype Performance
P = ½ηρV3
Turbinator Technologies
Prototype Goals
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Power Extraction
Efficiency: 6%
Tip over force: > 28 lbs
Weight: < 50 lbs
Assembly Time: < 60 min
Embedded Intelligence:
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– RPM with Microcontroller
– Voltage/Current Displayed
– Display RPM
– Display Voltage
– Display Current
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BONUS: Brake
17% Average Measured
Tested over full range.
47.8 lbs
22 minutes
Intelligence:

Electrical and Mechanical
Brake Installed
Turbinator Technologies
Conclusion

Feasible Design
– Prototype met all of the performance
requirements

Final Product Improvements
– Weatherproof nacelle
– Automated mechanical brake
– Lighter weight materials
– Packaging
– Mold Blades or Outsource
Turbinator Technologies
Questions ?
Turbinator Technologies
Blade Twist
Power vs. Blade Radius
Pitch Angle vs. Blade Radius
Turbinator Technologies