Engineering flowfield method with angle-of-attack applications

An approximate inviscid flowfield method has been extended to include heat-transfer predictions and a technique to account for the effect of variable-entr opy edge conditions on the heat transfer. Results of the approximate code have been validated by comparison with experimental data and results of detailed predictions. The engineering code computes the inviscid tlowfield and convective heating over hyperboloids, ellipsoids, paraboloids, and sphere-cones at zero deg angle of attack (AOA). An application to angle-of-atta ck conditions is included in the present method by using existing approximations to: 1) account for the streamline-spreading effects on the heat transfer along the windward and leeward rays of sphere-cones and 2) to compute the corresponding circumferential heating. Present results of the engineering calculations are shown to be in good agreement with existing pressure and heating data over sphere-cones, even at high incidence values, with the restriction that the sonic-line location remain on the spherical cap. The present technique has been demonstrated to provide a rapid but reliable method for predicting surface-measurable quantities and flow properties through the shock layer. The code represents a versatile engineering method for parametric or preliminary thermal design studies.

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