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Optical measurement and visualization of transonic airflow in a compressor blade cascade

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Abstract

The paper deals with optical measurements of transonic flow past a five-blade compressor blade cascade. The middle blade of this cascade can be set to different incidence angles simulating its torsional deformation. Classical optical methods (shadowgraphy, monochrome and color schlieren) were applied to visualize flow field in the inlet part of the cascade and compared to results obtained using a recent fiber-based spatial carrier digital interferometric setup. Measurements were done at inlet Mach number 1.09 and pressure ratio 1.32 with the middle blade set at 0\(^\circ\) and 3\(^\circ\) incidence offset. Results of individual techniques are analyzed and their utility is assessed. Shock wave configuration is best revealed by shadowgraphy, which is the least demanding method, whereas most information is provided by the digital interferometry. It is proved that the current interferometric setup is well applicable even when inexpensive acrylic glass optical windows are used. Thus, the method can be readily used for aerodynamic investigations where modifications of sidewalls are required.

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Acknowledgements

Authors would like to express their thanks to the Ministry of Education, Youth and Sports of the Czech Republic which supported this research in the framework of the Program Inter-Excellence - project LTAUSA19036 Advanced experimental research on synchronous and non-synchronous blade vibration. Support by the Duke University, USA is also gratefully acknowledged.

Funding

This study was funded by Ministry of Education, Youth and Sports of the Czech Republic in the framework of the Program Inter-Excellence - project LTAUSA19036 and by the Duke University, Durham, NC, USA.

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Authors and Affiliations

  1. Institute of Thermomechanics, Czech Academy of Sciences, Dolejškova 5, Prague, 182 00, Czech Republic

    David Šimurda, Martin Luxa, Jindřich Hála & Jan Lepicovsky

  2. Technical University of Liberec, Studentská 2, Liberec, 461 17, Czech Republic

    Pavel Psota & Petr Šidlof

  3. Department of Mechanical Engineering and Materials Science, Duke University, 90300, Durham, NC, 27708–0300, USA

    Robert Kielb

Authors
  1. David Šimurda
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  2. Pavel Psota
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  3. Petr Šidlof
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  4. Robert Kielb
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  5. Martin Luxa
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  6. Jindřich Hála
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  7. Jan Lepicovsky
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Contributions

P.Psota, M.Luxa, D.Šimurda, P.Šidlof and J.Lepicovsky, acquired and evaluated data. J. Hála supported experiments with CFD. R.Kielb, M.Luxa, P.Psota, P.Šidlof, D.Šimurda, wrote the main manuscript text. All authors reviewed the manuscript.

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Correspondence to David Šimurda.

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Šimurda, D., Psota, P., Šidlof, P. et al. Optical measurement and visualization of transonic airflow in a compressor blade cascade. J Vis 26, 529–549 (2023). https://doi.org/10.1007/s12650-022-00901-3

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