Abstract
This work suggests a new arrangement for measuring the total pressure inside ducts or pipes with non-standard flow field distributions. The device consists of an array of 81 Kiel probes distributed over the duct’s cross section. It facilitates the quick measurement of the integral total pressure e.g. behind an axial ventilator without the need to scan the duct section with a traversing or integrating additional substantial flow straightening devices. Wind tunnel tests have proven a tolerance towards deviating on-flow conditions of more than \(\pm 35^\circ \). The application of the Kiel probe array is shown in a wind tunnel fan test rig.
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Notes
- 1.
Duct edge length \(D=300\) mm
- 2.
\(\varphi _{tol}\) is defined to be the maximum angle for which the measured total pressure value \(p(\varphi )\) deviates by less than 1% from \(p(0^\circ )\), measured in the direct on-flow configuration.
- 3.
The wind velocity \(u_{wind}\) was 15 m/s during all angle sensitivity tests.
- 4.
Pressure values were averaged over 30 s, and the same local effects could be found continuously increasing over an increasing angle of attack. Both directions of rotation showed the same effect at the respective upstream frame edge. Differences between the directions of rotation were caused by small differences in probe design caused by manufacture, and inequalities of the two frame sides
- 5.
In Fig. 5, the probes for \(\bar{p}^*\) are located where \(x\) positions 4–6 overlap with \(y\) positions 2–4.
- 6.
The axial ventilator is influenced by 10 m/s air approaching its inlet at an angle of \(45^\circ \) to its rotation axis.
References
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Acknowledgments
The research leading to these results has received funding from the European Union’s Seventh Framework Programme (FP7/2007–2013) under grant agreement number 256797, within the “MACCSol” project.
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Heinemann, T., Bakeberg, C., Lienhart, H., Becker, S. (2014). Total Pressure Measurements Behind an Axial Ventilator Using a Kiel Probe Array. In: Dillmann, A., Heller, G., Krämer, E., Kreplin, HP., Nitsche, W., Rist, U. (eds) New Results in Numerical and Experimental Fluid Mechanics IX. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 124. Springer, Cham. https://doi.org/10.1007/978-3-319-03158-3_58
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DOI: https://doi.org/10.1007/978-3-319-03158-3_58
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