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�������պ����ѧѧ�� 2003, Vol. 29 Issue (6) :501-504    DOI:
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����1, �����1, Yury S. Kachanov2, Vladimir I. Borodulin2*
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Developments and Evolutions of Three��Dimensional Perturbations in��Transitional Boundary Layer
Guo Hui1, Lian Qixiang1, Yury S. Kachanov2, Vladimir I. Borodulin2*
1. Dept. of Flight Vehicle Design and Applied Mechanics, Beijing University of Aeronautics and Astronautics;
2. Institute of Theoretical and Applied Mechanics, Novosibirsk,Russia

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Abstract�� Formations and developments of typical 3-D perturbations, typically shown as Λ structures, hairpin vortices and ring-like vortices, were observed by means of hydrogen-bubble method in a transitional flat-plate boundary-layer excited by a modulated 2-D artificial perturbation. Visual results show the relationships between a hairpin vortex and a spike structure, which convince the forming mechanisms of spike structures. Dark spots, often detected in turbulent boundary layer, are also observed during flow breakdown, and results show that the instability of local high-shear layer caused by dark spots is probably responsible for flow breakdown.
Keywords�� boundary layer transition   flow characteristics   flow visualization   artificial excitation     
Received 2002-03-28;
Fund:

������Ȼ��ѧ����������Ŀ(16972004)

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����, �����, Yury S. Kachanov, Vladimir I. Borodulin.�߽��ת�������ά�Ŷ��ķ�չ���ݻ�[J]  �������պ����ѧѧ��, 2003,V29(6): 501-504
Guo Hui, Lian Qixiang, Yury S. Kachanov, Vladimir I. Borodulin.Developments and Evolutions of Three��Dimensional Perturbations in��Transitional Boundary Layer[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2003,V29(6): 501-504
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