The challenge of stereo PIV measurements in the tip gap of a transonic compressor rotor with casing treatment |
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Authors: | Melanie Voges Christian E Willert Reinhard Mönig Martin W Müller Heinz-Peter Schiffer |
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Institution: | 1.German Aerospace Center (DLR), Institute of Propulsion Technology,Cologne,Germany;2.Department of Gasturbines and Aerospace,Technische Universit?t Darmstadt,Darmstadt,Germany |
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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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