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�������պ����ѧѧ�� 2009, Vol. 35 Issue (6) :737-740    DOI:
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Effect and mechanism of lift-enhancement of the co-flow jet technology
Liu Peiqing, Kuang Jianmin, Qu Qiulin*
School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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Abstract�� The effect and mechanism of lift-enhancement of the co-flow jet technology was investigated by numerically simulating the flow around a co-flow jet airfoil. The Farve-averaged Navier-Stokes equation of unsteady compressible flow and the S-A turbulence model were solved by Fluent software. The results show that the co-flow jet technology remarkably reduces the zero-lift angle of attack of the airfoil, and increases the maximum lift coefficient and the stall angle of attack. The mechanism of lift-enhancement of the co-flow jet technology is analyzed theoretically. Firstly, it increases the circulation around the airfoil by accelerating the speed of the flow on its upper surface. Secondly, it decays the flow separation at the airfoil tail at high angles of attack through the injection of energy inside the boundary layer.
Keywords�� co-flow jet   flow control   effect of lift-enhancement   mechanism of lift-enhancement   numerical simulation     
Received 2008-05-07;
About author: ������(1960��),��,ɽ��������,����,lpq@buaa.edu.cn.
������, ������, ������.�����������Ƽ���������Ч���ͻ���[J]  �������պ����ѧѧ��, 2009,V35(6): 737-740
Liu Peiqing, Kuang Jianmin, Qu Qiulin.Effect and mechanism of lift-enhancement of the co-flow jet technology[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2009,V35(6): 737-740
http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2009/V35/I6/737
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