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Experiments in Fluids

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01.08.2011 | Research Article

Comparison of velocity and temperature measurements with simulations in a hypersonic wake flow

verfasst von: Robert Hruschka, Sean O’Byrne, Harald Kleine

Erschienen in: Experiments in Fluids | Ausgabe 2/2011

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Abstract

A hypersonic shock-tunnel flow around an axisymmetric model of a planetary entry probe is analyzed. Planar laser-induced fluorescence is applied to measure both the velocity and the rotational temperature everywhere in the central plane of the flow field. The experimental test case is compared to simulations using the direct simulation Monte Carlo (DSMC) method. While the Mach 9.7 flow at a freestream Reynolds number based on the model diameter of 35,000 is chemically frozen, effects of thermal non-equilibrium and localized rarefaction cannot be neglected. DSMC and measurements agree well within the outer wake, but disagree close to the centerline, where in particular the measured velocity is higher than values predicted by the simulations. The experimental results indicated a shorter recirculation region and increased local fluctuations in the free shear layer upstream of the wake recompression shock when compared to the simulation. These effects are attributed to incipient transition, which is not observed in the simulations, as the simulations did not model the effects of freestream fluctuations. Furthermore, measured and simulated vorticities are compared with theoretical predictions.

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Titel: Comparison of velocity and temperature measurements with simulations in a hypersonic wake flow
verfasst von: Robert Hruschka
Sean O’Byrne
Harald Kleine
Publikationsdatum: 01.08.2011
Verlag: Springer-Verlag
Erschienen in: Experiments in Fluids / Ausgabe 2/2011
Print ISSN: 0723-4864
Elektronische ISSN: 1432-1114
DOI: https://doi.org/10.1007/s00348-011-1039-9

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