A Technique to Measure the Pressure Distribution Acting on the Surface of a Spinning Body in a Wind Tunnel

Abstract
This report describes a new experimental technique evolved to measure the pressure distribution on the surface of a spinning body in a wind tunnel. The technique was successfully demonstrated by a series of wind tunnel tests of a spinning cylinder in crossflow. Surface pressure surveys were obtained on the cylindrical model for various tip speed ratios at subcritical, critical, and supercritical Reynolds numbers. The validity of the data was established by comparing the integrated pressure values with directly measured force data. The resulting pressure distribution data allow interpretation of the fundamental Magnus phenomenon and clearly indicate boundary layer and flow separation effects. This testing technique is applicable to various model configurations, angles of attack, and Mach number regimes.

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