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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2021, Vol. 42 ›› Issue (6): 124317-124317.doi: 10.7527/S1000-6893.2020.24317

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

Characteristics of flow field and boundary-layer stability of HyTRV

CHEN Jianqiang1,2, TU Guohua1, WAN Bingbing1, YUAN Xianxu1, YANG Qiang1, ZHUANG Yu3, XIANG Xinghao1   

  1. 1. State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang 621000, China;
    2. Computational Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China;
    3. Hypervelocity Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China
  • Received:2020-05-29 Revised:2020-07-27 Online:2021-06-15 Published:1900-01-01
  • Supported by:
    National Key Research and Development Program of China (2016YFA0401200); National Natural Science Foundation of China (11772350); National Numerical Wind Tunnel Project

Abstract: The Hypersonic Transition Research Vehicle (HyTRV) is a lifting body model with typical characteristics of a real aircraft designed for the study of boundary-layer transition on three-dimensional complex geometries. To support a more comprehensive and systematic study of hypersonic transition by means of theoretical analysis, numerical simulations, wind tunnel experiments and flight tests, the typical characteristics of the flow and the boundary-layer instability of the HyTRV model are analyzed with high-order numerical simulation, the Linear Stability Theory (LST) and the eN method. Results show that the HyTRV exhibits several relatively independent crossflow regions and streamwise vortices. The boundary layer of the HyTRV has common typical instability modes such as the crossflow mode, the second mode and the attachment line mode. The crossflow instability mode, which can lead to transition, appears in the crossflow region between the high- and low-pressure zones in the circumferential direction. Meanwhile, the second mode is also found in the crossflow region, though its N factor is generally smaller than that of the crossflow instability mode. The attachment line instability mode essentially belongs to the second mode, with a high frequency. The effects of the angle of attack and the unit Reynolds number on the boundary layer transition are also studied. The results show that with the increase of the angle of attack, the streamwise vortex structure along the centerline on the lower surface gradually disappears, and the crossflow Reynolds number gradually decreases; the original streamwise vortices on the upper surface gradually move from the side to the top and new streamwise vortices also appear. The N factors of all instability modes in general decrease gradually with the increase of the angle of attack, and increase significantly with the increase of the unit Reynolds number. Based on these results, advice on the typical instabilities including the streamwise vortex instability, the crossflow instability, the second mode and the attachment line instability are given.

Key words: lifting body, eN method, crossflow instability, attachment line instability, streamwise vortex

CLC Number: