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The challenge of stereo PIV measurements in the tip gap of a transonic compressor rotor with casing treatment

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Abstract

This contribution is aimed at summarizing the effort taken to apply stereoscopic PIV (SPIV) measurements in the tip clearance of a transonic compressor rotor equipped with a casing treatment. A light sheet probe was placed downstream of the stator and aligned to pass the light sheet through a stator passage into the blade tip clearance of the rotor. A setup with three cameras has been used in order to record the entire 2C velocity field and the smaller area of 3C field of view at the same time instance for comparison with earlier 2C PIV results. A homogeneous seeding distribution was achieved by means of a smoke generator. The main emphasis of the SPIV measurement was to establish a data set with high spatial resolution close to the compressor casing, where the aerodynamic effects of a CT are known to be strong. The paper will discuss some major aspects of the utilized PIV data processing and point out a variety of frequently underestimated error sources that influence the overall quality of the recovered data in spite of the fact that the individual PIV recordings seemed to be of very good quality. Thus, the authors will not focus on the PIV results and related interpretation of the flow field, but on the optimization and procedures applied during setup of the experiment and data processing, respectively.

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Acknowledgments

The authors gratefully acknowledge the good cooperation with MTU Aero Engines GmbH, namely Dr. C. Zscherp, who designed the casing treatment during a former research program in the framework of AG TURBO COOREFF-T (reference number 0327713 E). Based on the encouraging outcomes of this project, the PIV investigations have been continued, as reported in the present contribution.

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Authors and Affiliations

  1. German Aerospace Center (DLR), Institute of Propulsion Technology, 51170, Cologne, Germany

    Melanie Voges, Christian E. Willert & Reinhard Mönig

  2. Department of Gasturbines and Aerospace, Technische Universität Darmstadt, Petersenstr. 30, 64287, Darmstadt, Germany

    Martin W. Müller & Heinz-Peter Schiffer

Authors
  1. Melanie Voges
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  2. Christian E. Willert
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  3. Reinhard Mönig
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  4. Martin W. Müller
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  5. Heinz-Peter Schiffer
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Correspondence to Melanie Voges.

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Voges, M., Willert, C.E., Mönig, R. et al. The challenge of stereo PIV measurements in the tip gap of a transonic compressor rotor with casing treatment. Exp Fluids 52, 581–590 (2012). https://doi.org/10.1007/s00348-011-1061-y

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  • DOI: https://doi.org/10.1007/s00348-011-1061-y

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