Team 5 Propulsion PDR
description
Transcript of Team 5 Propulsion PDR
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
012345678
0 1 2 3 4 5 6 7
Weight (lbs)
Pow
er O
utpu
t (hp
)