Abstract
A probe is described which measures mass flow per unit area in a hypersonic shock tunnel and therefore, in combination with the pitot pressure, provides a measurement of local velocity and density. Gas is entrained from a stream tube of known cross-sectional area, cooled to ambient temperature by passage through a bed of small glass spheres, and ejected through a choked orifice of known size. A measurement of pressure ahead of the orifice is then used to deduce the mass flow without reference to the high temperature properties of the gas. Characteristics of the probe and experimental results are discussed.
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