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�������պ����ѧѧ�� 2006, Vol. 32 Issue (03) :271-275    DOI:
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������, ���廪, ���ĺ�*
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Influence of circular angle in symmetric plane to the flowfield characteristics of an axisymmetric parachute
Jiang Chongwen, Cao Yihua, Su Wenhan*
School of Aeronautic Science and Technology, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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Abstract�� According to the characteristics of parachute, the 3-D complex flow problem was transformed into an axisymmetric problem with computational timesaving, based on three assumptions (membrane assumption of canopy, axisymmetric assumption of parachute, and steady assumption of flowfield). After the circular angle in symmetric plane was defined and diameters of parachute bottom and top vent were kept invariable, a series of fluid dynamics computational model were established over circular angle range of 80°~140°. By solving renormalization group(RNG) ��k��-epsilon turbulence N-S equations, the numerical simulation result is in good agreement with the relative experiments. It is found that the influence of circular angle and parachute height is very small. The changes of drag in samples are below ±0.28%. The wake topology structure of axisymmetric parachute is unaltered with the circular angel of symmetric plane changed. There are two saddle points in the axis. With the circular angle in symmetric plane increased, the position of the first saddle point is fixed, and the position of the second saddle point moves wake oriented.
Keywords�� parachutes   topology   drag   numerical methods   axial flow   wake     
Received 2005-06-26;
Fund:

���ջ�����ѧ����������Ŀ(03E51042)

About author: ������(1982-),��,����������,˶ʿ��,cwjiang@vip.sina.com.
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������, ���廪, ���ĺ�.�Գ���Բ�ܽǶ���Գƽ���ɡ�������Ե�Ӱ��[J]  �������պ����ѧѧ��, 2006,V32(03): 271-275
Jiang Chongwen, Cao Yihua, Su Wenhan.Influence of circular angle in symmetric plane to the flowfield characteristics of an axisymmetric parachute[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2006,V32(03): 271-275
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