Design of a small pressure chamber to evaluate probe calibrations at varying Reynolds numbers

K. Speck, C. Schäffer, V. Gümmer

Research output: Contribution to journalConference articlepeer-review


The Chair of Turbomachinery and Flight Propulsion (LTF) at the Technical University of Munich (TUM) operates a wind tunnel for probe calibration (Caljet). This paper describes the design and the validation process of a pressure chamber. The pressure chamber is used to calibrate probes for turbomachinery applications at comparable conditions to a 3.5-stages axial compressor test rig. This allows the study of Reynolds number and Mach number effects individually. The pressure chamber is designed as an additional component for the Caljet to enable probe calibration at higher mass flow densities and higher Reynolds numbers. Therefore, the original free stream jet is encased by this chamber, nevertheless the outlet of the calibration wind tunnel remains open to the environment. After a first pre-design study, numerical simulations are carried out to confirm expected flow conditions in the measurement area. Ansys Fluent is used for RANS simulations with air modeled as compressible gas. The numerical results are validated with experimental investigations that simultaneously provide a deeper understanding of the flow behavior. Therefore, a five-hole probe, a hot-wire probe, and a Fast Response Aerodynamic Probe are utilized. It is shown that the capability of the jet meets the expectations and can be used for the calibration of hot-wire probes at conditions comparable to a state-of-the-art 3.5-stages axial compressor.

Original languageEnglish
Article number012023
JournalJournal of Physics: Conference Series
Issue number1
StatePublished - 2023
Event26th Biennial Symposium on Measuring Techniques in Turbomachinery, MTT 2022 - Pisa, Italy
Duration: 28 Sep 202230 Sep 2022


Dive into the research topics of 'Design of a small pressure chamber to evaluate probe calibrations at varying Reynolds numbers'. Together they form a unique fingerprint.

Cite this