Abstract

Results are presented from an experimental investigation of the boundary layer development and of local heat transfer coefficients on the surface of a blade in transonic and separated flow over blade cascades with different degrees of turbulence. The influence of the longitudinal pressure gradient and of the free-stream turbulence on the boundary layer development for two typical blade cascades is shown. Shadowgraphs and distributions of local heat transfer coefficients and of density gradient fluctuations along the contour of a blade in these cascades are analysed. It is shown that, just like in non-separated flow, the influence of the initial flow turbulence on heat transfer in the separation zone depends on the mode of flow in a boundary layer. In the zone of transonic flow the enhancement of heat transfer is observed only in the case of boundary layer separation due to its interaction with shock waves.

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