横方向汚染による超音速境界層の乱流遷移(安定性・乱流境界層・せん断流・遷移(3),一般講演)

概要

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In order to clarify the mechanism for supersonic boundary layer transition, Pitot-tube measurements are made for a Mach 1.86 supersonic boundary layer along a nozzle wall of small tunnel with rectangular cross section at various z-positions. The y-profiles of mean velocity are obtained and the friction velocity in the transition and the resulting turbulent region are estimated by correlating the Van Driest transformed mean velocity from Pitot-tube surveys with the composite profile (for incompressible mean velocity) consisting of Reichardt's inner layer profile and Finley's wake function. The results clearly show that the transition examined in this study occurs near the nozzle corner region first and the turbulence is spread by a process of "transverse contamination".
2009-09-02