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Study of strut interference in high-speed flows

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Abstract

Strut-support interference effects were investigated at a nominal Mach number of 6. Cylinder and rhombus models are used; moreover, models called half shock-bump (SB) and SB applied to the front and both sides of the shock-bump shape are used. This is beneficial for free-stream flow recovery around the model surface by bumping the compression and expansion waves at a unit Reynolds number of approximately \(17.8 \times 10^{3}/\hbox {m}\) and a total enthalpy of approximately 1.9 MJ/kg. A quantitative density field analysis is conducted using the background-oriented schlieren technique, which is validated by measuring the shock stand-off distance and density increase rate on a hemisphere model. In this study, flow interference is divided into the measurements of the recompression shock zone thickness as a wake interference and the free-stream flow density recovery beyond the oblique shock as a strut interference. In the SB model, the thickness of the recompression shock zone is approximately 4.4 ± 0.2 mm, which is a reduction of approximately 53% compared with the cylinder model. In the oblique shock wave height measurements, defined by measuring the intersection of the increasing and decreasing points of density, the SB model shows a height of 16.4 mm, which is approximately 33.6% less than the 24.7 mm height of the cylinder model. In addition, the free-stream flow density beyond the oblique shock wave in the SB model is found to have an approximately 10% deviation from the free-stream density of 0.016 \(\hbox {kg/m}^{3}\), which is more effective than the 106% higher value in the cylinder model. Through such studies of flow interference, the effect of the SB shape on the strut-support is verified.

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Acknowledgements

This work was supported by the Korea Space Launch Vehicle (KSLV-II) funded by the Ministry of Science, Information and Communications Technology, and Future Planning (MSIP) (No. 2016M1A3A1A02021183), and by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (No. 2018R1A6A3A01010886).

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  1. Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology, Daehakro 291, Daejeon, 34141, Republic of Korea

    Sungmin Lee, Hakyoon Song & Gisu Park

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Sungmin Lee is currently Postdoctoral fellow at Korea Aerospace Research Institute (KARI).

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Lee, S., Song, H. & Park, G. Study of strut interference in high-speed flows. Exp Fluids 61, 105 (2020). https://doi.org/10.1007/s00348-020-2934-8

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