Subsonic and Supersonic Boundary-Layer Flow past a Wavy Wall

Abstract

Steady two-dimensional compressible turbulent boundary-layer flow past a slightly wavy wall is studied both analytically and experimentally in the Mach number range 0.8 ^ M e ^ 1.8 at unit Reynolds numbers on the order of 10 6 per inch. The measured and predicted wall pressure distributions are in good agreement and indicate that the nonuniform flow in the boundary layer can produce essentially a subsonic type of wall pressure signature (p max in valleys) in the presence of moderately supersonic inviscid flows. An interesting cusping of the pressure is also observed in the transonic regime. Measurements of the wall temperature perturbations are also made; the results agree with theory in showing a strong correlation between 7^a x and P max .

Three-Dimensional Heat-Transfer and Ablation Disturbances in High-speed Flows

“…12 A typical comparison of the resulting pressure data with the predictions of the present theory is given in Fig. 4.…”

“…17 A detailed analysis of this case has been worked out for the particular example of a solid surface ablating strongly in pure sublimation.f The resulting boundary-layer disturbance solution is analogous to the foregoing wavy wall problem except that it is now intimately coupled to a corresponding spatially periodic solution of the wall thermal perturbation problem [Eqs. (12) and (13)], which is readily obtained in closed form. Further analytical details may be found in Ref.…”