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| Proper orthogonal decomposition study on vortex wave field behavior of channel flow |
| Received:November 16, 2017 Revised:December 11, 2017 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20171116003 |
| KeyWord:channel flow vortex wave field 2DPIV measurement POD analysis mode reconstruction |
| Author | Institution |
| 刘阁 |
重庆工商大学 废油资源化技术与装备工程研究中心, 重庆 |
| 陈彬 |
重庆工商大学 废油资源化技术与装备工程研究中心, 重庆 |
| 金兴 |
重庆工商大学 废油资源化技术与装备工程研究中心, 重庆 |
| 邓阳琴 |
重庆工商大学 废油资源化技术与装备工程研究中心, 重庆 |
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| Abstract: |
| Transient velocity vector field of the channel vortex wave field was experimentally measured out using two-Dimension Particle Image Velocimetry (2DPIV).Proper Orthogonal Decomposition (POD) technique was used to analyze the vector field data measured by 2DPIV,and the first 15 modes were determined by the mode energy rate,which represented characteristics of dominated structure of the vortex wave field.The results showed that the first 15 modes of POD decomposition reflected the characteristics of the channel vortex wave field comprised of vortex columns induced by channel wall shear layers and accompanied wavy mainstream.The mainstream wavy pulsation frequency was affected by the vortex pair through the development of large-scale vortexes;According to vortex wave field in the stagnation point and the saddle point, distinctive features were obtained,i. e.,a large-scale vortex pair of the field,an average flow field and Helmholtz vortex ring.The vortex wave field was reconstructed in accordance with the first 15 modal vortexes.The reconstructed field represented the main features of a vortex wave structure of wavy mainstream forms,vortex of coexistence conditions,and the characteristics of the vortex flow changes in the stagnation points,saddle point position of field of channel laminar flow,remove.The random information of PIV measurements flow field was removed effectively,and the dominant features PIV measurements flow fields were retained. |
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