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| Content Provider | The American Society of Mechanical Engineers (ASME) Digital Collection |
|---|---|
| Author | Schmid, Jonas Schulz, Achmed Bauer, Hans-Jörg |
| Copyright Year | 2018 |
| Abstract | The present paper focuses on the influence of a non-axisymmetric endwall on the flow field in a turbine passage. Therefore, laser Doppler velocimetry (LDV) is applied to both a non-axisymmetric endwall and a flat endwall as reference. Time mean values and fluctuating components of the velocity field are evaluated. Three-component LDV with up to 38000 valid coincident events per second is carried out up- and downstream of a linear cascade with high resolution, especially in the near-wall region of the suction surface, where secondary vortices are expected. The three velocity components recorded by the LDV are transformed into the orthogonal coordinate system of the turbine cascade, and several flow quantities, like turbulence parameters and parameters describing the secondary regime, are assessed. By comparing the data for the non-axisymmetric endwall and the flat endwall, the influence of the contouring on the secondary flow field is shown. To substantiate the measurements and gain a deeper insight, the data are compared to previous surface oil flow visualizations and specific results of former thermal studies. |
| Sponsorship | International Gas Turbine Institute |
| File Format | |
| ISBN | 9780791851005 |
| DOI | 10.1115/GT2018-75061 |
| Volume Number | Volume 2B: Turbomachinery |
| Conference Proceedings | ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition |
| Language | English |
| Publisher Date | 2018-06-11 |
| Publisher Place | Oslo, Norway |
| Access Restriction | Subscribed |
| Subject Keyword | Suction Turbulence Cascades (fluid dynamics) Laser doppler anemometry Vortices Flow visualization Resolution (optics) Flow (dynamics) Turbines |
| Content Type | Text |
| Resource Type | Article |
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