Abstract
The influence of high-temperature effects on the stability of the wake behind a cuboidal roughness element is presented. Different flow assumptions are considered, including a calorically perfect gas, a thermally perfect gas and a mixture of gases in chemical non-equilibrium. Two-dimensional linear stability (2D-LST) computations are performed along the roughness wake for each of the different flow models and compared. The results show that, in the vicinity of the roughness element, the sinuous perturbation is stabilized by the excitation of the vibrational energy mode, whereas the varicose disturbance presents a strong destabilization. Further downstream, the sinuous instability is found to decay at a slower rate when accounting for vibrational excitation in its modeling, yielding a higher integrated amplification factor than with a calorically perfect gas assumption.
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Acknowledgements
This work is part of a project that has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 675008. It was also partially funded by the Belgian National Fund for Scientific Research (FNRS) through the FRIA fellowship.
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Padilla Montero, I., Miró Miró, F., Pinna, F. (2022). Influence of High-Temperature Effects on the Stability of the Wake Behind an Isolated Roughness Element in Hypersonic Flow. In: Sherwin, S., Schmid, P., Wu, X. (eds) IUTAM Laminar-Turbulent Transition. IUTAM Bookseries, vol 38. Springer, Cham. https://doi.org/10.1007/978-3-030-67902-6_55
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