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

By Th. Von Kármán

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

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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. Il est naturellement difficile d'interpréter ce schéma; peut-être le comportement asymptotique de l'onde de choc qu'elle prédit: π ν + 2 = Cx, où la constante C dépend de la forme du nez, a-t-il quelque rapport avec le comportement asymptotique de l'onde de choc loin du nez d'un obstacle à nez émoussé (v = 0 pour le cas plan).

They also use a turbine and an electrical (or mechanical) drive. But they intend to use a regenerative helium cycle inserted in the process, with a heat sink at liquid hydrogen temperature. This closed-cycle machine would truly give the utmost of Carnot-efficiency, the temperature ratio being something like 50 to 1. With both arrangements some 700-8000 m/sec may be produced at reactor (gas-) temperatures in the region of 1200° to 1500°K. If reactor gas-temperatures of 2000° or even 2500°K are possible, the direct heating will of course be more practical.

The entropy as well as the tempera- The Role of Entropy in the Aero-space Sciences 770°C FIG. 18. Resonance tube. 1 atmospheres absolute and with a stagnation temperature of 20°C flows as a small jet against the opening of a straight circular platinum tube closed at the other end. Shock waves are running into the tube and are reflected at the closed end. Depending on pressure several shocks may be simultaneously in the tube. The tube is thermally insulated by an evacuated bulb and glows. Surface temperatures are about 1000°K, and the light emitted is quite appreciable.

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