High-temperature Calibration Facility for Calibrating Multihole Pressure Probes

Design, fabrication, commissioning and validation details of an unique high-temperature calibration facility for calibrating multihole pressure probes such as five-hole probes at high temperatures are described in this paper. The facility has a capability to calibrate different pressure probes up to a maximum velocity of 6 m/s and up to a maximum temperature of 300 °C. The flow at the exit of the calibration facility is surveyed at different velocities and temperatures using a cooled combination probe with a Pitot tube and a thermocouple. The pressure and temperature are found to be uniform over a limited region but still useful for calibration of pressure probes. A large size five-hole probe with thermocouples is calibrated in the yaw and pitch angle range of ± 30° using a computer-controlled calibration device at different velocities and temperatures. Representative calibration results are presented. © The Institution of Engineers (India) 2021.