Abstract
STUDY of the local normal-force ratio around an expansion corner of a lifting body reveals that, for certain Mach numbers and body shapes, completely isentropic calculations may differ considerably from rotational-flow results. In as suming isentropic flow, the effects of the entropy gradient around the body due to an axially asymmetrical shock wave are neglected. These effects can be considerable even for small angles of attack. A solution is presented here which considers rotational flow and assumes an entropy distribution described by Ferri, 2 for small angles of attack. This entropy distribution is valid only outside the vortical layer but is quite satisfactory for the normal-force calculations since there is no pressure gradient across the vortical
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