Comparison of velocity and temperature measurements with simulations in a hypersonic wake flow |
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Authors: | Email author" target="_blank">Robert?HruschkaEmail author Sean?O’Byrne Harald?Kleine |
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Institution: | (1) School of Engineering and Information Technology, University of New South Wales, Australian Defence Force Academy, Canberra, ACT, 2600, Australia |
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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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