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Int. J. Turbomach. Propuls. Power 2017, 2(3), 13; https://doi.org/10.3390/ijtpp2030013

Influence of Pressure Fluctuations on the Mean Value of Different Pneumatic Probes

Institute for Thermal Turbomachinery and Machine Dynamics, Graz University of Technology, Inffeldgasse 25a, 8010 Graz, Austria
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Academic Editor: Marcello Manna
Received: 20 March 2017 / Revised: 1 August 2017 / Accepted: 7 August 2017 / Published: 30 August 2017
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Abstract

For this study, measurements were carried out in a one-and-a-half stage test turbine. In order to characterize the flow field and to obtain steady flow quantities, five-hole probes are used in the rig in several measurement planes. Although a very high resolution in circumferential and radial direction is possible with five-hole probes, only certain sectors of the flow field can be measured due to quite long measurement times. For this reason, total pressure rakes, which can be traversed 360 degrees in a circumferential direction, were built for this test configuration. During foregoing measurements, differences between the total pressure measured with the rakes and the total pressure measured with a five-hole probes were observed, especially in the measurement plane downstream of the rotor where the flow is highly unsteady. It was found that the measured value for total pressure is particularly influenced by the stochastic pressure fluctuations and turbulence and can therefore deviate significantly from the “real” value. View Full-Text
Keywords: measurement technique; pneumatic probes; turbomachinery; turbulence; rakes; unsteady flow measurement technique; pneumatic probes; turbomachinery; turbulence; rakes; unsteady flow
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Bauinger, S.; Marn, A.; Göttlich, E.; Heitmeir, F. Influence of Pressure Fluctuations on the Mean Value of Different Pneumatic Probes. Int. J. Turbomach. Propuls. Power 2017, 2, 13.

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