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Time-resolved proper orthogonal decomposition of the near-field flow of a round jet measured by dynamic particle image velocimetry

2003; IOP Publishing; Volume: 14; Issue: 8 Linguagem: Inglês

10.1088/0957-0233/14/8/101

1361-6501

Wei-Tao Bi, Yasuhiko Sugii, Koji Okamoto, Haruki Madarame,

Combustion and flame dynamics

In this study time-resolved proper orthogonal decomposition (POD) is proposed for the new technique of dynamic (digital) particle image velocimetry (DPIV), and applied to study the coherent structures at the near field of a round jet flow. Time-resolved POD is computed in the radial direction, the axial direction and the temporal domain, in which the turbulence can be easily measured by DPIV. As a result, large-scale vortical structures and their spatial and temporal evolution at the round jet mixing layer are uncovered.