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Numerical investigation on separation control for flow over a bump with synthetic jet
Chen Zhanjun, Ba Yulong, Wang Jinjun*
School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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ժҪ Ϊ���о��ϳ��������ƹİ����������������Ч��,��������������ѧ���FLUENT® 6.3���Reynoldsƽ��Navier-Stokes����,ͨ�������İ�����Ħ����ϵ���ֲ�����������ṹ�Լ������׿ڸ��������ṹ,��ʾ�˺ϳ������Է���㲻�̶�����������Ŀ��ƻ���.�������:�ڷ����ǰʩ�Ӻϳ���������Ч��С��������Χ,�����䱻ʩ�ӵļ���"����",�������Ƶ�ʵ��ںϳ�������Ƶ��.����,�ڱ��о������ǵ������,����ϵ��Խ��,����Ч��Խ��.��ʱ��Ч����,��ʩ�����������ϵ��Ϊ0.369 1%�ĺϳ�����ʱ,�����ݳ��ȼ�С��11%.
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Abstract�� Numerical simulation on the separation flow control over a bump was carried out with synthetic jet actuator before the separation point. The Reynolds averaged Navier-Stocks equations were solved by FLUENT® 6.3. The mechanism of synthetic jet actuator flow separation control was discussed by analyzing the friction coefficient, the vortex structure separated from the bump and the flow field near the actuator orifice. When the synthetic jet actuator was turned on, the length of the recirculation region can be reduced, and the separation of flow was locked by synthetic jet, so the frequency of separation was equal to the frequency of synthetic jet. For the fixed actuating frequency, the larger the blowing momentum coefficients of the synthetic jet,the shorter the separation region downstream of the bump. When the maximum blowing momentum coefficient is 0.369 1%, the length of separation region can be reduced by 11%.
Keywords�� synthetic jet   bump   flow control   blowing momentum coefficient     
Received 2011-06-18;
Fund:������Ȼ��ѧ����������Ŀ(50976007)
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��ռ��, ������, ������.�ϳ��������ƹİ�������������ֵģ��[J]  �������պ����ѧѧ��, 2012,V(7): 886-890
Chen Zhanjun, Ba Yulong, Wang Jinjun.Numerical investigation on separation control for flow over a bump with synthetic jet[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2012,V(7): 886-890
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http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2012/V/I7/886
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