Statistical properties of streamwise velocity in a supersonic turbulent boundary layer
Statistical properties of streamwise velocity fluctuations in a supersonic boundary layer are examined using particle image velocimetry data. The mean velocity profile reveals a logarithmic region that extends farther from the wall (compared to incompressible boundary layers), up to y/? ? 0.5. The r...
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| Format: | Article |
| Language: | English |
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2007-09.
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| Online Access: | Get fulltext |
| Summary: | Statistical properties of streamwise velocity fluctuations in a supersonic boundary layer are examined using particle image velocimetry data. The mean velocity profile reveals a logarithmic region that extends farther from the wall (compared to incompressible boundary layers), up to y/? ? 0.5. The rms velocity profiles are consistent with previous measurements reported in the literature and indicates a plateau region between y/? = 0.3 and 0.6 with a nominal second peak at y/? ? 0.6. Contours of two-point correlations are forward leaning for reference locations near the wall and become more symmetric along both streamwise and wall-normal directions as the reference location moves away from the wall. The integral length scales (Lx) and the representative length scales (?xu) reveal an increasing-decreasing trend with distance from the wall, attaining a maximum within the logarithmic region at y/? ? 0.4 |
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