| Autor: |
Qi, Zhongyang, Zong, Siyu, Wang, Yankui |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 7/14/2021, Vol. 130 Issue 2, p1-14, 14p |
| Abstrakt: |
The repeatable and determinate pattern of asymmetric vortices at a regular state can be obtained by manually setting an artificial micro-perturbation (AMP) on the nose tip of a pointed-nosed slender body at a high angle of attack (AoA). Wind tunnel experiments and numerical simulations were conducted to investigate the predominant role of AMP in an asymmetric flow at α = 50°. The bi-stable asymmetric flow structures are presented when AMP rotates around the body axis. Thus, the corresponding side force acting on the slender body is shown as a square wave with two periods. The shear layer separation is presented as the separation lines to investigate the bi-stable asymmetry induced by the AMP. Results show that the AMP restricts the flow separation on the same side of the model with itself when it is located at windward. The separation location on the same side of the AMP moves to the leeward of the model (or the separation angle on the same side of the AMP increases); hence, the vortex rolls up from this side later than the other side. When the AMP is located at leeward of the slender body, it promotes the separation of flow on the same side of the model with itself. Thus, the separation location on the same side of the AMP moves to the windward of the model (or the separation angle on the same side of the AMP decreases) and the vortex rolls up from this side earlier the other side. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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