Development of specific structures occurring from hyper-breakable vorticity

DOI PDF 被引用文献1件 参考文献23件
  • Toshihiko Hiejima
    Department of Aerospace Engineering, Osaka Prefecture University , 1-1 Gakuen-cho, Nakaku, Sakai, Osaka 599-8531, Japan

書誌事項

公開日
2019-07-01
資源種別
journal article
DOI
  • 10.1063/1.5100643
公開者
AIP Publishing

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説明

<jats:p>The spatial development of hyperbreakable vorticity in a supersonic coaxial flow with an annular swirl is investigated using direct numerical simulation at Mach number 1.5. The results show that the unstable modes originate from inside and outside the vortex depending on the ratio of vorticity thicknesses and then specific structures develop with small scales as distinct from conventional shear flows; furthermore, the evolutions lead to generate a number of fine scales due to the secondary instability. The mechanism is caused by the instability due to the helicity profile in addition to the barotropic instability based on the inflection point of the inner vorticity. This study strongly indicates that rapid evolutions on a plane perpendicular to the streamwise direction are insensitive to compressibility effects in supersonic flows. Therefore, the novel vorticity is found to undergo a breakdown at a short distance.</jats:p>

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