Characterization of Environmental Disturbances on Hypersonic Crossflow Instability on the HIFiRE-5 Elliptic Cone
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2018, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved. Crossflow instabilities on a 2:1 elliptic cone in hypersonic flow have been investigated in the M6QT and ACE wind tunnels at the Texas A&M National Aerothermochemistry and Hypersonics Laboratory. Experiments on a PEEK 38.1% scale model of the HIFiRE-5 flight test article have been conducted to investigate the development of the crossflow instabilities as well as to characterize the freestream and surface conditions responsible for their initial amplitudes. The freestream environment was varied not only by running the model in both quiet and conventional tunnels but also by regulating the fluctuation levels experienced in the conventional facility through systematic model placement. ACE freestream measurements, using a Kulite pressure transducer mounted in a pitot probe configuration and a hot-wire anemometer, indicated that fluctuation levels at the upstream model station were half those at the downstream stations. Additional surface measurements were made in both facilities using IR thermography and fast-response PCB and Kulite surface mounted pressure transducers. These measurements were compared to previous data for the same run conditions and demonstrated excellent repeatability. Surface pressure data collected for this campaign allowed for analysis of instability growth through observation of waterfall power spectral density plots, and the IR data was further reduced to provide comparisons in terms of Stanton number.
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22nd AIAA International Space Planes and Hypersonics Systems and Technologies Conference
