Title: Fast Traveling Pneumatic Probes for Turbomachinery Applications
Authors: Brueggemann, Christoph
Badum, Lukas
Bauer, Maximilian
Schatz, Markus 
Vogt, Damian
Language: eng
Issue Date: 2020
Publisher: Gas Turbine Society of Japan
Document Type: Working Paper
Journal / Series / Working Paper (HSU): International Journal of Gas Turbine, Propulsion and Power Systems 
Volume: 11
Issue: 2
Page Start: 9
Page End: 16
Pages: 9-16
Publisher Place: Tokyo
Pneumatic probes are commonly used to determine the flow vector as well as the thermodynamic state of the fluid in turbomachinery applications. The conventional method to measure a flow passage velocity or pressure field is to move the probe to discrete positions and to hold a certain settling time before valid data can be recorded. This study presents a measurement methodology leading to a reduction in the required measurement duration of up to 70-90%, depending on the level of flow field resolution. The approach is based on the concept of continuously traversing probes as introduced by Gomes et al. [1]. However, the system model is changed by reducing the transfer function to a single PT1-behavior. While the experiments conducted by Gomes et al. [1] were limited to only linear cascade measurements, the method used here is extended to turbomachinery applications with highly complex flow structures. The continuous traverse measurements are validated through a comparison with conventional discrete measurements that include characteristic settling time. For this purpose, tests have been performed in an axial diffuser test rig operated with air and a low pressure steam turbine. The results obtained with the new approach show a good match, thus proving the viability of the proposed method for turbomachinery applications. For future tests, a significant reduction in measurement time and cost can be achieved.
Organization Units (connected with the publication): Strömungsmaschinen in der Energietechnik 
ISSN: 1882-5079
Publisher DOI: 10.38036/jgpp.11.2_9
Appears in Collections:Publications of the HSU Researchers (before HSU)

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