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�������պ����ѧѧ�� 2002, Vol. 28 Issue (5) :543-546    DOI:
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Effect of Apex Flap Length on Leading Edge Vortex Breakdown over Delta Wings
XU Yan, WANG Jin-jun*
Beijing University of Aeronautics and Astronautics, Dept. of Flight Vehicle Design and Applied Mechanics

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ժҪ Ϊ������������ǰԵ�����ѵķ���,�о��˴󹥽���(30°~50°)�ⶥ�����70°������ǰԵ�����ѵ�Ӱ��.�ھ�̬ʵ�������,�ⶥ���۶�������ǰԵ������Ӱ��IJ�����2��:�ⶥ�������۵ĽǶȼ��䳤��.ȾɫҺ��̬��ʾ�������:�ⶥ������������ۼ�С�˿��������������Ч����,�Ӷ��Ƴ���ǰԵ�����ѵķ���,������λ�������۽ǵı仯�ʷ����Ա仯�����۽���Խ��Ч��Խ��,��α��=35°ʱ����������ϵ�Ч��Ҫ�ȵ������۵ĺ�.
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Abstract�� The effectiveness of the apex flaps to control the vortex breakdown on a 70° sweep angle delta wings was studied experimentally. The angle of attack was in a range of 30°~50°. The flap angles and its length were found to be two important factors in determining the position of vortex breakdown in steady flow. Flow visualization results reveal that a drooping apex flap, effectively lowering the angle of attack of the portion of the wing closest to the apex can delay vortex breakdown. The variation in the flap angle produces a nonlinear effect on the vortex breakdown location, and it can be seen that the biggest flap produces the most significant effectiveness. The effect of the combination of the two apex flaps is better than that of single flap at ��α��=35°.
Keywords�� delta wings   flow visualization   experiment   apex flap   vortex breakdown     
Received 2001-01-15;
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����, ������.�ⶥ�����ȶ�������ǰԵ�����ѵ�Ӱ��[J]  �������պ����ѧѧ��, 2002,V28(5): 543-546
XU Yan, WANG Jin-jun.Effect of Apex Flap Length on Leading Edge Vortex Breakdown over Delta Wings[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2002,V28(5): 543-546
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