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Development and Implementation of a Technique for Fast Five-Hole Probe Measurements Downstream of a Linear Cascade

Institute of Jet Propulsion, Universität der Bundeswehr München, 85577 Neubiberg, Germany
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This paper is an extended version of our paper published in Proceedings of European Turbomachinery Conference ETC12 2017, Paper No. 290.
Int. J. Turbomach. Propuls. Power 2018, 3(1), 6; https://doi.org/10.3390/ijtpp3010006
Received: 31 December 2017 / Revised: 1 February 2018 / Accepted: 5 February 2018 / Published: 12 February 2018
Flow measurement using a linear compressor or turbine cascade is a well-established technique to characterize the flow in turbomachines with a certain degree of abstraction. A common way to obtain a general characterization of the flow is to measure the flow downstream of the cascade with a five-hole probe, obtaining, e.g., total pressure losses and flow turning. Pneumatic five-hole probes are used to capture steady or time-averaged flow quantities, if not specified otherwise. In dependency of probe geometry, measurement set-up and flow properties, such measurements can be very time-consuming. Various techniques, in order to decrease the measurement time, are proposed in literature but for certain applications the efforts required to implement such techniques can outweigh the enhanced measurement speed. In this paper, methods proposed by other authors are combined and extended to allow for fast or transient five-hole probe measurements at strongly varying flow conditions. The effectiveness of this method is presented for flow measurements downstream of a compressor cascade with attached and stalled flow (by varying the Reynolds number) as well as with steady and periodically unsteady inflow. The new method allows to reduce the measurement time by up to 90 percent without compromising measurement accuracy. In fact, due to higher spatial resolution, the flow downstream of the cascade can be better resolved with the new method. View Full-Text
Keywords: five-hole probe; pneumatic measurements; linear cascade five-hole probe; pneumatic measurements; linear cascade
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Gomes, R.A.; Kurz, J.; Niehuis, R. Development and Implementation of a Technique for Fast Five-Hole Probe Measurements Downstream of a Linear Cascade. Int. J. Turbomach. Propuls. Power 2018, 3, 6.

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