Unsteady structures over delta wings
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摘要: 利用流动显示技术、片光技术及PIV技术,对三角翼面上的各种非定常特性做了研究.分别对涡层中的小涡结构,二次涡同主涡相互作用所引起的二次涡的喷射效应,螺旋破裂扰动的非定常特性,涡破裂点沿轴方向振动的非定常特性,以及完全分离流中的非定常特征进行了较为细致的研究,给出了不同扰动的频率特性.Abstract: Visualization with light sheet and PIV tests were performed to investigate some unsteady structures over delta wings. Discrete sub-vortices in the vortex sheet, interaction of the secondary vortex with main vortex, the frequency characteristics of the spiral form of vortex breakdown, the fluctuation of breakdown location, and vortex shedding at high angles of attack were studied respectively. Different frequency is given for unsteady structures.
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Key words:
- flow visualization /
- delta wings /
- vortex /
- particle image velocimetry /
- unsteady
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[1] Shih C, Ding Z. Unsteady structure of leading-edge vortex flow over a delta wing . AIAA paper 96-0664, 1996 [2] Gursul I, Xie W. Buffeting flow over delta wings[J]. AIAA J, 1999, 37(1):58~65 [3] Gad-el-Hak M, Blackwelder R F. The discrete vortices from a delta wing[J]. AIAA Journal, 1985, 23(6):961~963 [4] Payne F M, Ng T T, Nelson R C. Visualization and wake surveys of vortical flow over a delta wing [J]. AIAA J, 1988, 26(2):137~143 [5] Muller J, Hummel D. Time-accurate CFD analysis of the unsteady flow on a fixed delta wing . AIAA paper 2000-0138, 2000 -
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