Sciences & Technologie
Volume 0, Numéro 19, Pages 70-75
2003-06-30

Density And Velocity Measurements In Turbulent He-air Boundary Layers



Authors : Soudani A . Bougoul S . Harion J.l .

Abstract

A turbulent boundary layer with large density variations has been generated by tangential injection of air or helium Into a boundary layer of air-helium mixture. Instrumentation based on thermoanemometry has been successfully developed for the investigation of this flow Analysis or the mean and fluctuating density fields shows that the flow is mainly governed by the ratio of the injection to the external velocity and that the density ratio plays a secondary role in the mixing processes. However, a sight enhancement of turbulent activity is observed when helium is injected

Keywords

Turbulent boundary layer, mixture of gas, flow with variable density, thermoanemometry.

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