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Compressible infinite swept wing
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For the compressible infinite swept wing, the PG transformation gives the following modified geometry,
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Figure 8.17: Prandtl-Glauert transformation of infinite swept wing.
Applying the previously-derived incompressible solution (8.97) we have
Cl = Cta a cos Л
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and the compressible Cl is then obtained using Gothert’s Rule and the reverse PG transformations.
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dCL да |
~ Р ’ |
Л |
х0° (2D) |
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dCL |
cea cos Л |
Л – |
>90° |
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да |
sin Л ’ |
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so that large sweep angles mitigate compressibility effects, as can be seen by the coalescence of the incompressible and compressible curves in Figure 8.18. |
