Correlations of unsteady vortex burst point and dynamic stability over a pitching double-delta wing
| Autor: | Xianyao He, Yang Zhang, Zhixiang Xiao, Jianqiang Chen, Huaixun Ren, Jian Liu |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
0209 industrial biotechnology Wing Delta wing Angle of attack Aerospace Engineering Stall (fluid mechanics) 02 engineering and technology Aerodynamics Mechanics 01 natural sciences 010305 fluids & plasmas Vortex 020901 industrial engineering & automation Computer Science::Sound Condensed Matter::Superconductivity 0103 physical sciences Detached eddy simulation Pitching moment |
| Zdroj: | Aerospace Science and Technology. 107:106256 |
| ISSN: | 1270-9638 |
| DOI: | 10.1016/j.ast.2020.106256 |
| Popis: | Pitching dynamic stability is significant for the aerodynamic performance of an aircraft at a large angle of attack (AoA). Commonly, the dynamic behaviour of vortex breakdown flows over an aircraft with a delta or double-delta wing (DW or DDW) configuration is closely related to the pitching dynamic stability. An 80°/65° DDW subjected to sinusoidal pitching motions around the stall AoA was numerically investigated using the delayed detached eddy simulation method [1] . This study is focused on the correlation between the unsteady behaviour of the vortex burst point (BP) and pitching dynamic stability. The reverse of the pitching dynamic stability is closely related to the inconsistent movement of the BP during the upstroke and downstroke in one pitching period. When the upstream speed of the BP is higher than the downstream speed, the variation in the pitching moment is ahead of the AoA, which leads to dynamic instability. Conversely, when the downstream speed is higher than the upstream speed, the DDW is dynamically stable. This correlation can be interpreted through the energy transfer relationship between the vortex breakdown flows and DDW model. |
| Databáze: | OpenAIRE |
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