Development of a Hot-Wire Anemometer for Hypersonic Turbulent Flows

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Abstract
A technique is described for constructing hot‐wire anemometer probes suitable for measuring turbulence in hypersonic wind tunnels. The main element of the technique is the use of liquid gold resinate for attaching extremely fine hot wires to the probe prongs. Probes mounting wires as small as ¼ μ diam have been built and tested successfully in flows of Mach numbers as high as 10, dynamic pressures of 370 mm Hg, and temperatures exceeding 540°C. The resistivity coefficients of these wires are normal, and their time constant has been measured to be as low as 5 μsec. At Reynolds numbers prevailing in typical flows the heat transfer and temperature recovery characteristics of these wires do not conform to the available theoretical predictions.

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