An investigation of the effects of surface mass transfer on the viscous hypersonic shock layer of a blunt body. Cheng's theory of the Newtonian shock layer is modified to include both suction and injection, and extensive numerical results are obtained for the injection of air into air. Results indicate that the heat-transfer and skin-friction reductions due to injection formula for all but extreme low-density flows. As the Reynolds number decreases, however, mass transfer becomes ineffective in reducing heating rates and skin friction, especially for a very cold wall. The effect of nonzero wall temperature is to increase the shock-layer thickness dramatically, and there are also indications that the wall-temperature level determines whether the asymptotic inviscid-shock-layer thickness is approached from above or below.
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