DESIGN AND FABRICATION FIVE HOLE PROBE CALIBRATION SYSTEM Zuhdy Masfuri, Dimas Sangaji, Haris Ilham, Saepuloh, Fadilah Hasim
National Laboratory for Aerodynamic, Aeroelastic and Aeroacoustic Technology
Agency of Assessment and Applied Technology
Abstract
A sphere Probe is a five-holed dynamic pressure probe that uses empirical relations to ascertain the local four velocity components and the total pressure of a flow at a point. The mechanical and control system designed to performe fixed method calibration for several velocity, pitch and yaw angles. The support should be rigid enough to withstand the incoming flow and separation. The step of the motor should be met the requirement of the accuracy and resolution determined for the measurement. DTC Initium provides automated data acquisition and reduction software and claims the Five hole Probe output is accurate up to velocities of 25 m/s at pitch and yaw angles of ±45⁰. The measurements are said to generally be within ±0.5 m/s for velocity and ±1⁰ for pitch and yaw measurements. Repeatability testing confirms the Probe can be used to reproduce results found in previous experiments. The testing also shows that the error in measurements is not random but based on a systematic bias. This bias could possibly be caused by the empirical technique used to determine the velocity components or be caused by flow separation at certain pitch and yaw angles. The robustness and ease of use make the Five hole probe an attractive measurement tool compared to other possible measurement techniques, including hot-wire anemometry, LDV, and PIV.
