Abstract
A new test facility was built up as a part of a closed-loop transonic wind tunnel in VZLU´s High-speed Aerodynamics Department. The wind tunnel is driven by a twelve stage radial compressor and Mach and Reynolds numbers can be changed by the compressor speed and by the total pressure in the wind tunnel loop by a set of vacuum pumps, respectively. The facility consists of an axisymmetric subsonic nozzle with an exit diameter de = 100 mm. The subsonic nozzle is designed for regimes up to M = 1 at the nozzle outlet. At the nozzle inlet there is a set of a honeycomb and screens to ensure the flow stream laminar at the outlet of the nozzle. The subsonic nozzle can be supplemented with a transonic slotted nozzle or a supersonic rigid nozzle for transonic and supersonic outlet Mach numbers. The probe is fixed in a probe manipulator situated downstream of the nozzle and it ensures a set of two perpendicular angles in a wide range (±90°). The outlet flow field was measured through in several axial distances downstream the subsonic nozzle outlet. The total pressure and static pressure was measured in the centreline and the total pressure distribution in the vertical and horizontal plane was measured as well. Total pressure fluctuations in the nozzle centreline were detected by a FRAP probe. From the initial flow measurement in a wide range of Mach numbers the best location for probe calibration was chosen. The flow field was found to be suitable for probe calibration.
Highlights
The main activity of High-speed Aerodynamics Department is providing aerodynamics measurement of flow fields in different applications in High-speed wind tunnels
Pneumatic probes are still a wide-range tool when the flow field is studied in turbomachinery application
The probes used for the measurements are VZLUs in-house products and it is necessary to calibrate each probe before it is used for the measurement due to manufacture inaccuracies
Summary
Pneumatic probes are still a wide-range tool when the flow field is studied in turbomachinery application They are used in the measurements in linear cascades and in whole turbine stages as well. The measured flow is perpendicular to the fixation probe axis (“L” probes) This type of probes is used in full stage turbine testing. The fixing of the probe to the test section side wall requires a special calibration rig to provide rotation in the second angle and a slot in the test section wall. This brings issues with sealing and with precision of static pressure reading
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