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�������պ����ѧѧ�� 2005, Vol. 31 Issue (02) :167-171    DOI:
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Structure evolution of the steady and symmetric vortex pattern around a slender
Li Guohui, Deng Xueying, Ma Yu*
School of Aeronautic Science and Technology, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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Abstract�� The structure evolution of flow pattern around a slender was calculated by numerical method. It was pointed that the development of slender vortices leads to the change of topological structure about cross flow, and a critical flow pattern will appear. A high-order singular point in this flowfield was analysed by differential equation qualitative theory. The index of the high-order singular is -3/2. The topological structure of this singular point is instable, so bifurcation will be occurred and the topological structure of flowfield will be changed by little disturbance. The 3-dimensional flow structure of the steady and symmetric vortices pattern around a slender was gained.
Keywords�� slender   topology   high-order singular point   bifurcation   structure stability     
Received 2004-06-20;

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About author: �����(1966-),��,����������,��ʿ��, ghleebh0368@sina.com.cn.
�����, ��ѧ��, ����.�����ԳƱ�����̬��ϸ���������ṹ���ݱ�[J]  �������պ����ѧѧ��, 2005,V31(02): 167-171
Li Guohui, Deng Xueying, Ma Yu.Structure evolution of the steady and symmetric vortex pattern around a slender[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2005,V31(02): 167-171
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