Design, Fabrication, Calibration and Validation of a Nine Hole Probe for Measurement of Flow With Large Angles

Abstract

The design and fabrication details of a nine hole pressure probe for measurement of flow with large angles are presented. The probe is calibrated at a velocity of 40 m/s in a yaw range of ±90° and a pitch range of -70° to 90° at intervals of 10°. The calibration space is divided into 9 zones, in each of which pressure from one of the nine holes is maximum. Calibration coefficients based on the pressures from this hole and other holes around this hole are defined in each of these zones. Additional data acquired during the calibration are used to validate the data reduction method. The errors in total and static pressures and flow velocity and angles are found to be small.