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1 Transactions of the Institute of Fluid-Flow Machinery

1 2003

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Flow field behind the wake generator

Kaiser M., Wierciński Z.

Transactions of the Institute of Fluid-Flow Machinery

2003

nr 112

3-20

The investigation of the non-stationary flow behind the wake generator is presented. The mean velocity and rms velocity fluctuations are measured. The coordinates of points where the wakes from the windward side of the generator are intercepted by the wakes (rods) from the leeward of the generator are determined. The co-ordinates of these points depend on the diameter of the generator, the velocity of the oncoming flow and the frequency of rotation, i. e. the Strouhal number of the generator. The results of calculation are compared with the measurements and a good compatibility has been obtained. At the points of the wake cutting an increased fluctuations level is measured. The results of these investigations can be used in the study of the boundary layer transition induced by wakes with the influence of the wake cutting effect. This phenomenon is known in the turbomachinery as the so called clocking effect where they generate regions of enhanced turbulence level.