Advances in Aeronautical Sciences. Proceedings of the Second by Th. Von Kármán

By Th. Von Kármán

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By Th. Von Kármán

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Extra info for Advances in Aeronautical Sciences. Proceedings of the Second International Congress in the Aeronautical Sciences, Zürich, 12–16 September 1960

Sample text

Il est également possible — et cela est plus sûr—de chercher à construire une seconde approximation donnant une indication sur l'importance de l'erreur commise. L'étude systématique des anomalies de l'écoulement newtonien a été poussée fort loin dans le livre de Hayes et Probstein(37), mais l'interprétation en est malaisée. Nous nous contenterons ici de mentionner le concept de couche libre de Lighthill-Hayes d'après lequel l'onde de choc décolle de l'obstacle à partir du point où la formule de Newton-Busemann prédit une pression nulle.

The application of shock tubes for the study of supersonic and hypersonic gas flow is well known. Here I shall consider only a simple case of shock reflexion, the so-called resonance tube(23). A cyUndrical tube completely or nearly closed at one end and open at the other end is used. A super- 2ö DANIEL AND FLORENCE GUGGENHEIM MEMORIAL LECTURE sonic air jet is directed towards the open end. Long ago Hartmann found that this device produces a periodic in-and-out flow of gas and outside intense ultrasonic waves*2**.

An infinite number of shocks with vanishing strength gives as a limit isentropic compression, but even a very limited multiplicity shows a considerable gain, as exemplified in the case of a (plane) The Role of Entropy in the Aero-space Sciences 23 ramjet where the propulsive efficiency is improved (Fig. 14). Well designed intake diffusors are of great importance for the realization of economic supersonic airliners. The structure of shock waves Shock waves are not real discontinuities, though they are sometimes very thin.

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