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Loss determination at a linear cascade under consideration of thermal effects

Published online by Cambridge University Press:  06 July 2020

S. Aberle-Kern*
Affiliation:
Institute of Jet Propulsion, Universität der Bundeswehr München, 85577Neubiberg, Germany
R. Niehuis
Affiliation:
Institute of Jet Propulsion, Universität der Bundeswehr München, 85577Neubiberg, Germany
T. Ripplinger
Affiliation:
GE Aviation, Thermal & Combustion Systems, 85748Garching, Germany

Abstract

Targeting higher efficiencies and lower fuel consumption of turbomachines, heat transfer and profile loss are research topics of particular interest. In contrast to that, the interaction of both was, so far, rarely investigated, but gains in importance in recent research activities. The profile loss of engine components can be characterised by the airfoil wakes at the blade rows utilising established measurement and evaluation methods for which an adiabatic flow is typically supposed. To enable the investigation of the influence of heat transfer at the blade on the loss characteristics, a novel evaluation procedure was set up. In addition to the pneumatic data, the total temperature in the airfoil wake at a linear cascade was measured by means of a five-hole probe with an integrated thermocouple. For the evaluation and analysis of these data, different definitions of the loss coefficient were investigated and, finally, extended to account for thermal aspects. Furthermore, established techniques to average the local wake data were applied and compared with special focus to their suitability for non-adiabatic cases. Moreover, an extended version of the mixed-out average as defined by Amecke was utilised applying not only a far-reaching consideration of a temperature gradient but also the inclusion of the third spatial dimension to enable the evaluation of field traverses in addition to single wake traverses. These techniques were applied to wake measurement data from a linear compressor cascade gained in a special test set-up in the high-speed cascade wind tunnel for different operating points and different blade temperatures. The suitability of the new methods could be proven, and initial steps of the aerodynamic analysis of the resulting data are presented. Thereby, the acquired techniques turned out as powerful methods for the evaluation of wake traverses on compressor and turbine cascades under non-adiabatic conditions.

Type
Research Article
Copyright
© The Author(s), 2020. Published by Cambridge University Press on behalf of Royal Aeronautical Society

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Footnotes

A version of this paper was presented at the 24th ISABE Conference in Canberra, Australia, September 2019.

References

REFERENCES

Gomes, R. and Niehuis, R.Aerothermodynamics of a High-Pressure Turbine Blade With Very High Loading and Vortex Generators, ASME Journal of Turbomachinery, 134, (1), 011020, 2012. https://doi.org/10.1115/1.4003052CrossRefGoogle Scholar
Denton, J.D.Loss mechanisms in turbomachines, ASME Journal of Turbomachinery, 115, (4), pp 621656, 1993. https://doi.org/10.1115/1.2929299CrossRefGoogle Scholar
Stotz, S., Guendogdu, Y. and Niehuis, R.Experimental investigation of pressure side flow separation on the T106C airfoil at high suction side incidence flow, ASME Journal of Turbomachinery, 139, (5), 051007, 2017. https://doi.org/10.1115/1.4035210CrossRefGoogle Scholar
Schobeiri, M.T., Gilarranz, J.L. and Johansen, E.S. Aerodynamic and performance studies of a three-stage high pressure research turbine with 3-D - blades, design point and off-design experimental investigations, Proceedings of ASME Turbo Expo: Power for Land, Sea, and Air, 2000-GT-0484 Munich, Germany, May 8–11, 2000. https://doi.org/10.1115/2000-GT-0484CrossRefGoogle Scholar
Lim, C.H., Pullan, G. and Northall, J., Estimating the loss associated with film cooling for a turbine stage, ASME Journal of Turbomachinery, 134, (2), 021011, 2012. https://doi.org/10.1115/1.4003255CrossRefGoogle Scholar
Gunn, E.J. and Hall, C.A.Loss and deviation in windmilling fans, ASME Journal of Turbomachinery, 138, (10), 101002, 2016. https://doi.org/10.1115/1.4033163CrossRefGoogle Scholar
Cumpsty, N.A. and Horlock, J.H.Averaging non-uniform flow for a purpose, ASME Journal of Turbomachinery, 128, (1), pp 120129, 2006. https://doi.org/10.1115/1.2098807CrossRefGoogle Scholar
Amecke, J. Auswertung von Nachlaufmessungen an ebenen Schaufelgittern, Technical Report 67A49, AVA Göttingen, Germany, 1967.Google Scholar
Prasad, A.Calculation of the mixed-out state in turbomachine flows, ASME Journal of Turbomachinery, 127, (3), pp 564572, 2005. https://doi.org/10.1115/1.1928289CrossRefGoogle Scholar
Leipold, R., Boese, M. and Fottner, L.The influence of technical surface roughness caused by precision forging on the flow around a highly loaded compressor cascade, ASME Journal of Turbomachinery, 122, (3), pp 416424, 2000. https://doi.org/10.1115/1.1302286CrossRefGoogle Scholar
Hilgenfeld, L. and Pfitzner, M.Unsteady boundary layer development due to wake passing effects on a highly loaded linear compressor cascade, ASME Journal of Turbomachinery, 126, (4), pp 493500, 2004. https://doi.org/10.1115/1.1791290CrossRefGoogle Scholar
Leggett, J., Priebe, S., Shabbir, A., Michelassi, V., Sandberg, R. and Richardson, E.Loss prediction in an axial compressor cascade at off-design incidences with free stream disturbances using large eddy simulation, ASME Journal of Turbomachinery, 140, (7), 071005, 2018. https://doi.org/10.1115/1.4039807CrossRefGoogle Scholar
Howell, R.J. and Roman, K.M.Loss reduction on ultra high lift low-pressure turbine blades using selective roughness and wake unsteadiness, The Aeronautical Journal, 111, (1118), pp 257266, 2007. https://doi.org/10.1017/S0001924000004504CrossRefGoogle Scholar
Pianko, M. and Wazelt, F. Propulsion and energetics panel working group 14 on suitable averaging techniques in non-uniform internal flows, Advisory Group for Aerospace Research and Development, No. AGARD-AR-182, 1983.Google Scholar
Strutt, J.W.(Lord Rayleigh) Aerial plane waves of finite amplitudes, Proceedings of the Royal Society of London A, 84, (570), pp 247284, 1910. https://doi.org/10.1098/rspa.1910.0075Google Scholar
Kost, F.Längswirbelentstehung in einem Turbinenlaufrad mit konischen Seitenwänden, PhD thesis, DLR Cologne, 1993.Google Scholar
Schlichting, H. The variable density high speed cascade wind tunnel of the Deutsche Forschungsanstalt für Luftfahrt Braunschweig, Advisory Group for Aerospace Research and Development, AGARD-Report Nr. 91, 1956.Google Scholar
Sturm, W. and Fottner, L. The high-speed cascade wind-tunnel of the German Armed Forces University Munich, 8th Symposium on Measuring Techniques for Transonic and Supersonic Flows in Cascades and Turbomachines, Genoa, Italy, 1985.Google Scholar
Aberle, S., Bitter, M., Hoefler, F., Carretero Benignos, J. and Niehuis, R.Implementation of an in-situ infrared calibration method for precise heat transfer measurements on a linear cascade, ASME Journal of Turbomachinery, 141, (2), 012004, 2019. https://doi.org/10.1115/1.4041132CrossRefGoogle Scholar
Barlow, R.J.Statistics: A Guide to the Use of Statistical Methods in the Physical Sciences , Vol. 29, John Wiley & Sons, 1993. https://doi.org/10.1002/piuz.19910220112Google Scholar
Sutherland, W.The viscosity of gases and molecular force, Philosophical Magazine Series 5, 36, (223), pp 507531, 1893. https://doi.org/10.1080/14786449308620508CrossRefGoogle Scholar
Mayle, R.E. The role of laminar-turbulent transition in gas turbine engines, Proceedings of ASME 1991 International Gas Turbine and Aeroengine Congress and Exposition, 91-GT-261, Orlando, FL, June 3–6, 1991. https://doi.org/10.1115/91-GT-261CrossRefGoogle Scholar