Double wedge aerofoil section

Example 6.12 Using Ackeret’s theory obtain expressions for the lift and drag coefficients of the cambered double-wedge aerofoil shown in Fig. 6.52. Hence show that the minimum lift-drag ratio for the uncambered double-wedge aerofoil is y/2 times that for a cambered one with h = tjl. Sketch the flow patterns and pressure distributions around both aerofoils at the incidence for (LjD)max. (U of L)

Double wedge aerofoil section

No camber

Double wedge aerofoil section

Double wedge aerofoil section

Fig. 6.53 Flow patterns and pressure distributions around both aerofoils at incidence of [L/D]max

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