A New Criterion to Determine the Position of Vortex Breakdown Point

摘要：

A criterion based on the vorticity magnitude of the vortex core by 2D PTV method to determine the position of vortex breakdown point on a chined fuselage model is presented. In order to validate this criterion, the axial velocity of the vortex core is measured by Stereo PIV method on each cross section. An asymmetric angular configuration of two OCD cameras is applied to the Stereo PIV system, so that the particle images of Stereo PIV and 2D PIV results can be captured simultaneously. The results show that on the cross section of the vortex breakdown point, the axial velocity distribution across the vortex core shifts from the spray pattern to the wake pattern, leading to a sharp reduction of the axial velocity in the vortex core. Meanwhile the vorticity magnitude of the vortex core also decreases dramatically at the vortex breakdown point, caused by the abrupt diffuse of the vortex core and the sharp reduction of the circumferential velocity gradient This characteristic can be used as a criterion to determine the position of vortex breakdown point.

关键词： vortex flow vortex breakdown PIV velocity measurement vorticity chined fuselage

作者: Dong Chao Deng Xueying Wang Yankui Wu Guangxing

作者单位: School of Aeronautic Science and Technology, Beijing University of Aeronautics and Astronautics,Beij School of Aeronautic Science and Technology,Beijing University of Aeronautics and Astronautics,Beiji

会议类型: 国际会议

会议名称: 2010 Asia-Pacific International Symposium on Aerospace Technology(2010 亚太航空航天技术研讨会 APISAT 2010)

会议地点: 西安

会议语种:英文

页码: 137-140

在线出版日期: 2010-09-01（万方平台首次上网日期，不代表论文的发表时间）