Viscous Hypersonic Flow by William H. Dorrance

Author:William H. Dorrance
Language: eng
Format: epub
Publisher: Dover Publications
Published: 2017-04-15T04:00:00+00:00

Thus, it appears that the vorticity number Ωe is independent of s in the strong-interaction region. For air, the value of Ωe is about 0.11 for an insulated plate. According to the results of Ting, this would represent an increase in skin friction for a constant-density boundary layer of about 250 per cent over values given by the theory of a flat-plate constant-density boundary layer with vorticity absent.

6-5. Conclusions. The region where the leading-edge shock wave and the boundary layer strongly interact was investigated in Sec. 6-2. It was found that the proper similarity parameter for this region is and that the interaction effects are significant when . The interaction effect at any value of was reduced by heat transfer to the surface because heat transfer results in a cooler gas layer and hence higher density in the layer. The effects of strong interaction on heat transfer vary as and thus can be quite significant for , other factors being equal.

Leading-edge blunting and vorticity effects were investigated in Secs. 6-3 and 6-4, respectively. Some conclusions which can be drawn from the analysis presented in these sections include the following :

1. Leading-edge bluntness creates a region of high pressure aft of the leading edge which overshadows the strong-interaction effect. This region is bounded by the inequality

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