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

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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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Acknowledgments

This work was funded by the Australian Research Council under discovery project DP0666941. We thank G. Foppoli and P. Walsh for their technical support. The contributions of G. Park, S. Gai and K. Watts are appreciated. Furthermore, we would like to acknowledge the courtesy of G. A. Bird for letting us use his DS2V (V4.5) DSMC code.

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  1. School of Engineering and Information Technology, University of New South Wales, Australian Defence Force Academy, Canberra, ACT, 2600, Australia

    Robert Hruschka, Sean O’Byrne & Harald Kleine

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  1. Robert Hruschka
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Correspondence to Robert Hruschka.

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Hruschka, R., O’Byrne, S. & Kleine, H. Comparison of velocity and temperature measurements with simulations in a hypersonic wake flow. Exp Fluids 51, 407–421 (2011). https://doi.org/10.1007/s00348-011-1039-9

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