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Good Wind HuntingFinal Presentation: The Two-Bladed HAWT
Engineers:Andrew Fountain
Shadae Boakye-YiadomMarshall Gordon
Joe Moss
April 16, 2015
Prepared for Oor, Dean, and Airy
Overview● Lack of an established electrical grid in Guatemala● We were asked to design a small-scale wind turbine by ODA
Objectives:● Produce consistent power● Low cost● Durable● Easy to assemble● Safe
Agenda● Discuss prototype design● Describe design changes● Outline budget● Analyze performance● Recommend improvements for future designs
BladesInitial:● One piece● No hub● 6 cm chord length
Final:● 2 separate blades● Central hub● 10 cm chord
length
Preliminary BudgetItem Cost/
Item $Quantity Total Cost $
4in Lazy Susan 4.48 1 4.48
4in steel hose ties 1.39 3 4.17
2.5ft Steel rod shaft 5/8ths inch 5.77 1 5.77
1 meter long by 0.12 meter diameter PVC pipe 16.67 1 16.67
3”x3” Large timber rod, at least 1.5 meter long 3.97 1 3.97
Gear set 15.00 1 15.00
1 inch phillips head screws 4.37 1 4.37
Total (including 6% tax) 62.81
ItemCost/Item ($) Quantity Total Cost ($)
4in Lazy Susan 4.48 1 4.48
4in steel hose ties 1.39 3 4.17
2.5ft Steel rod shaft 1/2 inch bore 5.77 1 5.77
0.12 meter diameter PVC pipe 6.67 1 6.67
3”x3” Large timber rod (1.5m long) 3.97 1 3.97
Gear set and hubs 22.45 1 22.45
½ inch Bearings* 5.00 2 10.00
Plywood* 10.00 1 10.00
Wiring and Resistors* 1.00 1 1.00
Total Expenditure 47.51
Total* (including 6% tax) 68.71
Final Budget● Goal was < $100● We were well under
this goal● Final budget was $6
more than initial, due to gear set
● Items with * were found in the lab and not purchased
Performance Analysis
● Objectives:o Produce consistent power- inconclusiveo Low cost- meto Durable- meto Easy to assemble- meto Safe- met
Performance Analysis
● Average Voltage: 0.567 Volts● Resistance: 20 Ohms● Average Power: 0.0167 Watts
● Average Wind Speed: 2.84m/s ● Average Efficiency: 0.164%● Cut-in Speed: ~1m/s ● Tip speed ratio: 14.2
Technical Recommendations ● Optimize blades
o Use one piece for blades instead of two o Make the blades as thin as possible o Increase width of the bladeso Test to find optimal pitch angle
● Increase electrical resistance● Decrease bearing resistance● Increase sturdiness
Conclusion ● Implemented the 2-Bladed HAWT
design● Our design worked!● Met most of our objectives● Future designs should:
o Optimize bladeso Increase electrical resistanceo Use improved bearingso Increase sturdiness
“I was raised to be charming, not sincere”