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Blade Element Theory (1/2) - Coggle Diagram
Blade Element Theory (1/2)
How increase
in momentum is made
Design of blades
matters
Blade produces forces
Lift and Drag
Efficiency
\( \eta= \dfrac{Lift}{Drag} \)
Depends on
Airfoil profile
Most used profile
NACA 66
Depends on
Angle of incidence
Results of tests show
Small angles
Lift coefficient varies
linearly with angle
Drag remains small
Large angle
Lift drops
Drag raises quick
Zero lift
not at zero angle
at negative angle
Highest ratio
Small Angles
