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Provides information on a study in which a free-piston-driven expansion tubes are capable of generating flow conditions over a wide range of enthalpies ranging from orbital up to superorbital velocities. Identification of impurities using the emission studies; Determination of metallic contaminants at moderate enthalpies; Use of emission spectroscopy and a two-wavelength holographic interferometry.

Provides information on a study which investigates the supersonic flow around a cylindrical body using two optical techniques. Information on the apparatus setup; Employment of flow tagging by laser-enhanced ionization; Velocity measurements in the wake of a cylindrical body; Application of PLIF thermometry.

The article presents a study which examines an ablating surface in expansion tunnel flow. Researchers conducted a one-dimensional semi-finite analysis in order to examine whether the surface temperature would be enough to produce vaporization of the insulation. They created an ablating shock layer with an epoxy coating on an axisymmetric model during steady test flow in a high-enthalpy superorbital expansion tunnel. Chemical reactions between the epoxy ablation gases and the air test gas produced high levels of cyanogen.