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EXPLORATORY STUDIES OF A LOW GAMMA, HIGH MACH NUMBER WIND TUNNEL USING FREON 14 AS THE WORKING FLUID
DAVID SARNOFF RESEARCH CENTER PRINCETON N J
The design of a low gamma, high Mach number wind tunnel was studied as a possible facility in which to obtain knowledge of gamma effects on hypersonic flow fields. The impetus for this study stems from an interest in low gamma effects for the extrapolation of helium wind tunnel dataAND BECAUSE OF THE FUNDAMENTAL GAMMA INFLUENCES IN HYPERSONIC FLOW THEORY. The inherent problems in designing such a wind tunnel were investigated and a particular practical design outline presented for a system using heated Freon 14. It would operate with gamma near 1.1, maximum Mach numbers from 7 to 9, at low Reynolds numbers, and with mean free paths from 0.002 to 1.2 inches at the design point. The feasibility of the unorthodox design features have been demonstrated in exploratory experiments but substantial engineering development is still required. Author
AF49 638 465