Generalized forms of Blasius’s well-known formulae for the lift and moment in incompressible flow are obtained for the tangent gas, and applied to the porous aerofoil problem. The assumptions made in the paper are ( a) that the ideal gas can be replaced by a Kármán-Tsien tangent gas, ( b) that the mass flow through the porous wall is linearly related to the pressure difference across the wall, and ( c) that the mass of air sucked into the aerofoil is relatively small no restrictions are placed on the magnitude of the aerofoil incidence or thickness. ![]() A theory is developed enabling the flow of an inviscid compressible gas at subsonic speeds past a porous aerofoil, with a given pressure on the inside of the porous surface, to be calculated.
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