Three·Dimensional Flow Measurement by Means of Multi-sampling Scan with a Small Pressure Sensor

Abstract

A technique for three-dimensional flow measurement has been developed by use of a single pressure sensor buried in a cone-type head. The probe actuator involves a stepping motor to rotate it about its axis as instructed by a microcomputer. A great number of output data are obtained with random sampling pulses at each rotating angle, and the average and the variance of these outputs are calculated by the on-line computer. The three-dimensional velocity components and pressure can be obtained by solving the calibration equations. The turbulent intensity is also estimated from the variance. The accuracy of the measurement has been investigated in a potential core and fully developed turbulent region of a circular jet.