HYPERSONIC FLOW STUDIES.
Final rept. Oct 63-Oct 68,
RENSSELAER POLYTECHNIC INST TROY N Y
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An experimental study of low-density hypersonic flow over a slender cone was conducted using air and helium as the test gases. The test flows spanned a range of free-stream Mach numbers from 12 to 24 in air, and from 36 to 80 in helium the range of Reynolds numbers extended from 200 to 100,000. A fundamental theoretical approach was sought to obtain guiding principles which will permit a unified determination of the equations of flux and equilibrium in fluid mechanics. The present approach is based on the principle of recent equilibrium and was applied to several simple situations, e.g., a collisionless gas expanding into an evacuated tube. The interaction of thermal-energy gas particles with a solid surface was analyzed using a simple model. Statistical methods were applied to the model to determine the velocity distribution function of reflected particles in terms of the parameters of the problem. Author
- Fluid Mechanics