Abstract
Two-component laser Doppler velocimeter (LDV) measurements were made in a supercritical, separated, transonic diffuser flow exhibiting self-excited oscillations. The velocity data were ensemble-averaged with respect to the shock oscillation phase, and maps of various flow quantities were generated. The time evolution of the fluctuating velocity field shows a large, rotating structure that originates near the upstream edge of the separation bubble and is convected downstream. The streamwise velocity fluctuation pattern for the self-excited oscillations resembles the oscillation pattern that occurs when the flow is mechanically excited at the downstream end. Velocity fluctuations calculated from ensemble-averaged core total and static pressure data show good agreement with the LDV data.
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