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- W2088669570 abstract "The authors present initial results of hot wire anemometry triggered PIV measurements of periodic effects in an annular compressor cascade. The investigations are focused on the unsteady effect of a rotating instability (RI) and are based on PIV measurements performed within the passage of a highly loaded annular compressor cascade. Simultaneously, hot wire measurements were conducted within the same passage. Post-processing the hot wire signal by means of the wavelet transform obtained the time resolved frequency spectrum as well as the time resolved phase angles. Such spectra allow filtering the PIV results to select only the results that feature the investigated effect of PI. The corresponding phase angles of the wavelet transform enable grouping the selected PIV results in phase classes. The average of each class gives the statistical mean flow field for the corresponding phase angle. Afterwards, the statistical mean period of the RI can be displayed by discrete ensemble averaged PIV results. The presented method improves the possible temporal resolution of PIV systems beyond their technical sampling rate. In the case presented, the statistical method leads to a temporal resolution corresponding to a sampling rate of 1.5 kHz, whereas the effective sampling rate of the PIV system used is 4 Hz. The possible resolution in time is only limited by the number of phase classes and accordingly by the number of PIV measurements." @default.
- W2088669570 created "2016-06-24" @default.
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- W2088669570 date "2014-06-16" @default.
- W2088669570 modified "2023-09-26" @default.
- W2088669570 title "Experimental Analysis of Rotating Instability Using Hot Wire Triggered PIV and Wavelet Transform" @default.
- W2088669570 doi "https://doi.org/10.1115/gt2014-26752" @default.
- W2088669570 hasPublicationYear "2014" @default.
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