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- W2122662015 abstract "Examination of the literature shows that the comparison between experiment and computation for highly separated unswept compression ramp flows is particularly poor, irrespective of the turbulence model used. The upstream influence is not predicted correctly, the wall pressure rise through separation to the ramp corner is too steep, and the pressures under the separated shear layer are too high. In the current study, the objective was to determine if these discrepancies for such nominally two-dimensional separated flows might be attributable to either the flowfield unsteadiness or thrce-dimensionality, more than to inadequate turbulcncc modelling. To cxaminc this possibility wall pressure fluctuations were measured under the unsteady separation shock wave in a 28 deg. unswept compression ramp flow at Mach 5. Measurements were made using up to eight transducers oriented either streamwise or spanwise for various transducer spacings. Conditionally sampled pressure signals were used to generate snapshotsn or framesn of the instantaneous separation shock front as it passed over the transducer array. Sequences of these frames were studied to determine the time-averaged and dynamic properties of the separation shock front. The results show that: (i) the time-averaged wall pressure field under the spanwise rippling shock is essentially two;dimensional, (ii) the instantaneous separation shock front is nominally two-dimensional in the sense that the streamwise amplitude of the rippling motion is a small fraction of the length of the region over which the shock translates, and (iii) the large scale, low frequency separation shock unsteadiness controls the distribution of time-averaged surface properties. It is most likely that neglect of the unsteadiness is the primary cause of the discrepancy between experiment and computation." @default.
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- W2122662015 date "1990-01-08" @default.
- W2122662015 modified "2023-09-25" @default.
- W2122662015 title "Spanwise properties of the unsteady separation shock in a Mach 5 unswept compression ramp interaction" @default.
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- W2122662015 doi "https://doi.org/10.2514/6.1990-377" @default.
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