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Second Symposium on Turbulence and Shear Flow Phenomena
June, 27-29, 2001, KTH, Stockholm, Sweden

DOI: 10.1615/TSFP2

A SPATIAL STRUCTURE OF A FLOW OF AXISYMMETRIC SUDDEN EXPANSION

pages 417-422
DOI: 10.1615/TSFP2.2330
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Краткое описание

A flow transition for an axiymetric sudden expansion was experimentally investigated. Spatio-temporal flow field measured using ultrasonic velocity profiler and analyzed by a two-dimensional Fourier transform and a proper orthogonal decomposition. The variation of the zero-cross point of the axial velocity distribution, the energy of velocity fluctuation directed to upstream and the eigenmode spectrum have the same transitional scheme with respect to Reynolds number. The transitional scheme can be classified as laminar flow for Red < 1000, and transitional regime for Red = 1000−4000 and turbulent regime for Red > 4000. We found that the two large change occurs in the transitional regime at around Red = 1500 and 2000. The jump that occurs at Red = 2000 is caused by the change of the flow condition in the upstream pipe. The jump at Red = 1500 shows a change of the spatial structure of the flow.

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