Intermittent corner separation in a linear compressor cascade

To gain a better knowledge of the mechanisms of corner separation and to obtain a database that could be used to calibrate large eddy simulation, a detailed and accurate experimental investigation of the flow field in a linear compressor cascade has been carried out at a Reynolds number of 3.82 × 105 based on the blade chord and the inlet free stream velocity. The experimental data include (1) the inlet flow conditions measured by one-dimensional hot-wire anemometry, (2) the static pressure on the blade and the endwall measured by pressure taps, (3) the outlet flow measured by a five-hole pressure probe, and (4) the velocity field in the passage measured by two-component laser Doppler anemometry. In this highly intermittent corner separation, the points with bimodal histograms of velocity exist and mainly appear around the mean interface of separated flow and non-separated flow. This bimodal phenomenon is due to two aperiodic modes in the flow field.

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