propulsion qdr
DESCRIPTION
Propulsion QDR. Scott Bird Mike Downes Kelby Haase Grant Hile Cyrus Sigari Sarah Umberger Jen Watson. Preview. Choice of Engine Redesigning of Propeller Manufactured Choice Cruise Conditions. Constraining Conditions. SHP constraint = 4.08 SHP design =5.0. - PowerPoint PPT PresentationTRANSCRIPT
October 7, 2003 Propulsion PDR 1
Team 5 Propulsion PDRTeam 5 Propulsion PDR
• Scott Bird• Mike Downes• Kelby Haase• Grant Hile• Cyrus Sigari• Sarah Umberger• Jen Watson
October 7, 2003 Propulsion PDR 2
PreviewPreview
• Engine Selection
• Propeller Sizing
• Manufactured Choice
October 7, 2003 Propulsion PDR 3
Constraining ConditionsConstraining Conditions
• SHPconstraint = 4.08
• SHPdesign=5.0
October 7, 2003 Propulsion PDR 4
Preliminary Choice for EnginePreliminary Choice for Engine
• BME-50
• Power = 5.0hp
• RPM: 1200-10,000
• Weight = 3.25 lbs.
October 7, 2003 Propulsion PDR 5
Propeller SizingPropeller Sizing
• Used modified gold.m code
• Varied Pitch and Propeller Diameter
• Assume RPM = 7000
• Assume Velocity = 50 ft/s
http://www.danspropshop.com/pitch.html
October 7, 2003 Propulsion PDR 6
Propeller SizingPropeller Sizing
• Coefficient of Thrust vs. Advance Ratio
October 7, 2003 Propulsion PDR 7
Propeller SizingPropeller Sizing
• Coefficient of Power vs. Advance Ratio
October 7, 2003 Propulsion PDR 8
Propeller SizingPropeller Sizing
• Efficiency vs. Advance Ratio
October 7, 2003 Propulsion PDR 9
Propeller SizingPropeller Sizing
• Efficiency vs. Power Output
Blue: Increasing Pitch
Black: Increasing Diameter
October 7, 2003 Propulsion PDR 10
Propeller SizingPropeller Sizing
• Efficiency vs. Power Output
Diameter = 25”
Pitch = 6”
October 7, 2003 Propulsion PDR 11
Propeller SizingPropeller Sizing
• Efficiency vs. Power Output at 7000RPM
• Pitch = 6 in.• Diameter = 25 in.• J = 0.2057/rev• η = 51%• Power = 4.71 hp
• CT = 0.034
• CP = 0.0139
• Velocity = 50 ft/s
October 7, 2003 Propulsion PDR 12
Propeller SizingPropeller Sizing
• Used second modification of gold.m code
• Held Pitch constant at 6 inches and Diameter constant at 25 inches
• Assume Velocity = 50 ft/s
• Varied RPM
October 7, 2003 Propulsion PDR 13
Propeller SizingPropeller Sizing
• Efficiency vs. Advance Ratio
October 7, 2003 Propulsion PDR 14
Propeller SizingPropeller Sizing
• Coefficient of Thrust vs. Advance Ratio
October 7, 2003 Propulsion PDR 15
Propeller SizingPropeller Sizing
• Coefficient of Power vs. Advance Ratio
October 7, 2003 Propulsion PDR 16
Propeller SizingPropeller Sizing
• Maximum Efficiency at Cruise is 3800 RPM
• At Maximum Efficiency of Cruise – CT = 0. 0145
• At Maximum Efficiency – CP = 0.0078
October 7, 2003 Propulsion PDR 17
Propeller SelectionPropeller Selection
• Chose propeller from available stock at www.BMEengines.com
• Comparison of available propellers to Efficiency graph, chose a 22 in. X 8 in. propeller
October 7, 2003 Propulsion PDR 18
Propeller SelectionPropeller Selection
• New Propeller – 22 in. X 8 in.• At 7000 RPM
– J = 0.234
– CP = 0.022
– CT = 0.048
– η = 50%
• At Cruise, best RPM = 3300
October 7, 2003 Propulsion PDR 19
Summary Summary
• Diameter of propeller = 22 inches• Pitch of propeller = 8 inches• Efficiency of propeller = 50%
• Still to Come– Geometric Properties such as airfoil section, twist
distribution, chord distribution and shape
– Trade studies of effect of AR and CLmax on Power Loading
October 7, 2003 Propulsion PDR 20
QuestionsQuestions
• Questions??
October 7, 2003 Propulsion PDR 21
Engine StudyEngine Study
Power Output vs. Weight
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Weight (lbs)
Pow
er O
utpu
t (hp
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