Correction of inertial effect on a sphereprobe to measure the unsteady flow
Abstract
When a combined sphereprobe is used to measure the instantaneous value of velocity in the unsteady flow where both magnitude and direction of velocity vary strongly, the inertial effects on the pressure reading of the probe should be considered. A procedure is developed to secure the accurate measurement of velocity by the probe, assuming that the pressure reading is superimposed with the viscous term and the inertial term. The former is obtained by the calibration test, and the latter is predicted by the inviscid theory. The time derivative in the inertial term is determined from the time series data of the pressure reading using a digital computer. Applying this method to the experimental data, it was shown that one or two times iteration was enough for predicting the inertial term. The FORTRAN computer program is included.
 Publication:

Kyushu Institute Technology Bulletin
 Pub Date:
 June 1974
 Bibcode:
 1974KyITB.......67M
 Keywords:

 Flow Measurement;
 Inertia;
 Instrument Errors;
 Pressure Sensors;
 Unsteady Flow;
 Velocity Measurement;
 Acceleration (Physics);
 Calibrating;
 Error Analysis;
 Error Correcting Devices;
 Falling Spheres;
 Fortran;
 Instrumentation and Photography