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SPATIO-TEMPORAL TURBULENT STRUCTURES OF THERMAL BOUNDARY LAYER SUBJECTED TO NON-EQUILIBRIUM ADVERSE PRESSURE GRADIENT

Tomoya Houra
Department of Electronical and Mechanical Engineering, Department of Environmental Technology, Nagoya Institute of Technology, Gokiso-cho, Showa-ки, Nagoya 466-8555, JAPAN

S. Shakouchi
Department of Mechanical Engineering, Nagoya Institute of Technology Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan

Yasutaka Nagano
Nagoya Industrial Science Research Institute; Department of Mechanical Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan

Resumo

We have experimentally investigated a non-equilibrium turbulent boundary layer subjected to an adverse-pressure-gradient developing on a uniformly heated flat wall. The spatio-temporal structures educed from a multi-point simultaneous measurement are reasonably interpolated based on the "proper orthogonal decomposition (POD)". In the near-wall region, elongated hot regions stay dull and less active; on the other hand, large-scale cold regions having strong energy frequently invade the near-wall region. Then, the energy-containing events in the near-wall region are dis- cussed based on the results of wavelet analysis.