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A hypersonic expansion tube facility was designed and constructed to primarily study supersonic combustion phenomena. This paper provides an overview of the range of conditions the facility is capable of generating along with a discussion on how well a number of parameters required to accurately replicate conditions for supersonic combustion are achievable. A series of experiments using three low-to-mid enthalpy conditions were used to characterize and assess the extent of impact that flow-nonidealities have on the final test gas properties. Aspects such as shot-to-shot repeatability, temporal and spatial test gas uniformity, boundary-layer properties, and the presence of flow disturbances are analyzed. The shot-to-shot variation in the measured shock speeds corresponded to acceptable bulk variations of the aerothermodynamic properties of the test gas flow. Temporally, both the static and total pressures increased over the test gas slug, offsetting each other in a manner that kept the inferred test gas Ma...

Flow Characterization of a Hypersonic Expansion Tube Facility for Supersonic Combustion Studies