Unsteady Calibration of Fast-Response Pressure Probes, Part 2: Water-Tunnel Experiments

Abstract

This part of our work presents the development of a water-tunnel setup to experimentally determine the instantaneous pressure distribution over a sphere in unsteady flow, the unsteady pressure coefficient, and to provide validation of the unsteady probe calibration techniques discussed in Part 1. To generate an unsteady flowfield with significant inertial effects, a water-tunnel setup was developed where flow unsteadiness was generated by oscillating a spherical probe with a diameter of 50.8 mm at frequencies up to 4 Hz. The steady and unsteady pressure coefficients were experimentally determined