Title: Fast Traveling Pneumatic Probes for Turbomachinery Applications
Authors: Brueggemann, Christoph
Badum, Lukas
Bauer, Maximilian
Schatz, Markus 
Vogt, Damian
Affiliation: Institute of Thermal Turbomachinery and Machinery Laboratory (ITSM), University of Stuttgart
Turbomachinery and Heat Transfer Laboratory, Technion, Israel Institute of Technology
Institute of Thermal Turbomachinery and Machinery Laboratory (ITSM), University of Stuttgart
Institute of Thermal Turbomachinery and Machinery Laboratory (ITSM), University of Stuttgart
Institute of Thermal Turbomachinery and Machinery Laboratory (ITSM), University of Stuttgart
Language: en
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
Abstract: 
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 
eISBN: 1882-5079
DOI: 10.38036/jgpp.11.2_9
Appears in Collections:Publications of the HSU Researchers (before HSU)

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