Abstract
The vortex street of a turbine blade profile (VKI-1, 58 mm chord length) was investigated by particle image velocimetry (PIV) and laser vibrometry in a Mach number range between 0.26 and 0.78. While the laser vibrometer (LV) measured the frequency of the density fluctuations in the wake and around the profile, PIV helped to clarify the vortex shedding process. The recordings done by the LV resulted in detailed frequency data of vortex shedding when Mach number and Reynolds number were varied, while the results obtained by PIV enabled a phase resolved measurement of the flow field during vortex shedding.
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Acknowledgement
This work was made possible by the Austrian Science Fund (FWF) and the Austrian Ministry for Education, Science and Culture (BMBWK) within the grant Y57-TEC (Non-intrusive measurement of turbulence in turbomachinery). We thank Prof. Sieverding for his personal communication. The support of Dr. P. Pirker in the operation of the 3-MW compressor station is also gratefully acknowledged. Graz University of Technology is a partner in the thematic network PIV-NET funded by the European Union (EU) and coordinated by DLR, Göttingen, Germany.
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Woisetschläger, J., Mayrhofer, N., Hampel, B. et al. Laser-optical investigation of turbine wake flow. Exp Fluids 34, 371–378 (2003). https://doi.org/10.1007/s00348-002-0568-7
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DOI: https://doi.org/10.1007/s00348-002-0568-7