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Numerical Study of the Effects of a Counterflow Jet on the Drag Reduction of a Blunt Body in a Hypersonic Flow

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Abstract

A numerical investigation has been conducted for the drag reduction of a counterflow jet with a blunt body at Mach 6. The computational study was carried out by solving two-dimensional axisymmetric Reynolds-averaged Navier–Stokes (RANS) equations. The Spalart–Allmaras one-equation turbulence model was used in this study. The jet flow of exit Mach number 2.86 interacts with the free stream and changes the single shock structure to a multiple shock structure. The purpose of this study was to investigate the influence of the stagnation pressure based on a parameter, the momentum parameter ratio (MPR), which can characterize the jet. The result shows that the flow field can be categorized as being in a long penetration mode (LPM) or short penetration mode (SPM) depending on the penetration length of the free-stream flow. In the LPM, under overexpanded jet conditions, the shock structure fluctuates continuously, so the flow field is unstable. On the other hand, in the SPM, the shock structure is nearly fixed, and the entire flow field is stable. For this reason, even if the penetration length of the flow field in the SPM is less than that in the LPM, the aerodynamic drag can be reduced by up to 40%. Therefore, it becomes clear that jet pressure conditions can significantly improve aerodynamic performance by reducing the drag applied to the blunt body.

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Acknowledgements

This work was conducted at the High-Speed Vehicle Research Center of KAIST with the support of the Defense Acquisition Program Administration (DAPA) and the Agency for Defense Development (ADD). This work was supported by the Advanced Research Center Program (NRF-2013R1A5A1073861) through the NRF Grant funded by the Korea Government (MSIP) contracted through Advanced Space Propulsion Research Center at Seoul National University.

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  1. Hee Yoon

    Present address: Agency for Defense Development, Daejeon, 34186, Republic of Korea

Authors and Affiliations

  1. Department of Aerospace Engineering, Inha University, Incheon, 22212, Republic of Korea

    Hyoung Jin Lee

  2. School of Mechanical Engineering, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea

    Bok Jik Lee

  3. Department of Mechanical and Aerospace Engineering, Institute of Advanced Aerospace Technology, Seoul National University, Seoul, 08826, Republic of Korea

    Hee Yoon & In-Seuck Jeung

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  1. Hee Yoon
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  2. Hyoung Jin Lee
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Correspondence to Bok Jik Lee.

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Yoon, H., Lee, H.J., Lee, B.J. et al. Numerical Study of the Effects of a Counterflow Jet on the Drag Reduction of a Blunt Body in a Hypersonic Flow. Int. J. Aeronaut. Space Sci. 19, 828–835 (2018). https://doi.org/10.1007/s42405-018-0095-2

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  • DOI: https://doi.org/10.1007/s42405-018-0095-2

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