Three-dimensional numerical simulations are conducted to investigate supersonic flow over capsule/canopy two-body configurations at a freestream Mach number of 2.0 and a freestream unit Reynolds number of 2.04×107  m−1. Four cases representing different flow modes with varying distances from the forebody (capsule) to the afterbody (canopy) are carried out with detached eddy simulations. The flow evolutions and aerodynamic properties of the configurations are investigated. The pressure fluctuations on the inner surface of the afterbody show a strong correlation with the position of critical shear layers (containing high turbulence kinetic energy) in the wake of the forebody. A large pressure fluctuation is observed when the shear layer acts on the inner surface and vice versa. The drag of the afterbody mainly contributed by the pressure forces first decreases and then increases as the distance between the two bodies is increased. In addition, by analyzing the lateral force of the afterbody, it is found that the proximity of the bodies only has a weak effect on the lateral stability performance.

    The present study can provide suggestions for the design of supersonic parachutes. By investigating the flow evolution of four cases with varied proximity of the capsule/canopy two-body configurations (X/d), it is found that only a configuration with a large enough X/d (Case D in the present study) can sustain a bow shock of the canopy, leading to a more stable flow dynamic in comparison with the other three cases. Besides, Case D also features good aerodynamic performance, as the case sustaining a bow shock can provide a large magnitude of inner-surface pressure of the canopy due to the subsisting upward step of pressure (The step occurs when fluids cross shocks). Thus, a well-design supersonic parachute should be characterized by a large enough X/d. Additionally, in Case D, there is a conical shear layer generated when the wakes of the capsule cross the bow shock of the canopy. The shear layer contains high turbulent kinetic energy, and a large pressure fluctuation is observed when the shear layer acts on the inner surface and vice versa. Therefore, “avoiding the shear layer acting on the inner surface of the canopy” may also be a useful suggestion for designs of supersonic parachutes.


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    Titel :

    Unsteady Supersonic Flows Past Two-Body Configurations with Different Separation Distances


    Weitere Titelangaben:

    J. Aerosp. Eng.


    Beteiligte:
    Fan, Jianhui (Autor:in) / Hao, Jiaao (Autor:in) / Wen, Chih-Yung (Autor:in) / Xue, Xiaopeng (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    01.01.2023




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch