3.1 - Optimization of the illumination optics for gap flow velocity measurements in turbo machines

R. Schlüßler, Ch. Blechschmidt, A. Fischer & J. Czarske
Understanding and designing the tip leakage flow in turbo machines is one important point for i ncreasing their efficiency. Therefore optical flow velocity measurements in the less than 1 mm wide tip gap are necessary. These measurements are very challenging because disturbing light reflections e.g. from the rotor blade tip are increasing the measurement uncertainty. Hence, the disturbing light reflections need to be reduced. Using diffraction theory it was possible to optimize the parameters of...