Velocity distributions around a rocket fairing model were measured with PIV to obtain a validation data for numerical simulation and to clarify the influence of the expansion waves on the turbulent boundary layer. Mach number of the uniform flow was 0.8. Reynolds number based on the diameter of the fairing cylinder was 2.6 × 10~6. Velocity profiles in the boundary layer around the shoulder of the cone-cylinder body were successfully measured using a 2D-PIV system and a specially designed seeding rake. The velocity data was evaluated considering the influence of the traceability of the particles. The profiles of the velocity fluctuation around the shoulder were complex due to the interaction between the boundary layer and waves. The Reynolds stress of the boundary layer was reduced by the expansion waves emanating from the model shoulder.
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