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Experimental analysis of the velocity field inside a turbine blade cooling channel by means of particle image velocimetry


Autore: L. Casarsa, T. Arts

Collana: CA - 57 - Pisa 2002

The present experimental study is dealing with a detailed aerodynamic investigation of the turbulent flow inside a rib-roughened turbine blade cooling channel by means of Particle Image Velocimetry (PIV). The main objectives of the paper are to provide detailed information about the behaviour of such a complicated flow, useful for its understanding, and to create a wide and reliable data base for numerical code validation. The measurements are carried out at engine representative Reynolds number within a scaled up model of a stationary straight cooling channel, with turbulent promoters (ribs) installed on one wall. The ribs have an angle of attack of 90 deg with respect to the "mean" flow direction; their blockage ratio is equal to 30%. A detailed three-dimensional view of the flow field is presented and the main time-averaged flow features are identified; a number of rms characteristics are put in evidence and compared to the heat transfer data already available on the same channel geometry.

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