Importance of the vane exit Mach number on the axial clearance-related losses

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Grönman, A.; Biester, M.H.-O.; Turunen-Saaresti, T.; Jaatinen-Värri, A.; Backman, J. et al.: Importance of the vane exit Mach number on the axial clearance-related losses. In: Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 230 (2016), Nr. 2, S. 175-183. DOI: https://doi.org/10.1177/0957650915623087

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Sum total of downloads: 61




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Abstract: 
More efficient and physically smaller axial turbine designs are promoted to lower emissions and increase revenue. The physical size and the weight of the axial turbine can be minimised by adjusting the distance between successive stator and rotor rows. The influence of changing stator-rotor axial clearance can usually have either a positive or a negative influence on the turbine performance, and the reasons for this varying behaviour are not currently fully understood. A previous study revealed several design parameters that correlate with the efficiency curve shape. However, the effects of two parameters, namely the stator outlet Mach number and the reduced blade passing frequency, still remained unclear. Therefore, a novel approach is taken to analyse the correlations between the two design parameters and the axial clearance efficiency curve shape. Several different turbines are analysed using data available in the literature, and also new data are presented. The study suggests that the stator outlet Mach number correlates reasonably well with the efficiency curve shape, and it was further linked to five loss mechanisms and the rotational speed. Although the unsteady interaction plays an important role in the loss share, the level of unsteadiness did not correlate with the efficiency curve shape. © 2015 Institution of Mechanical Engineers.
License of this version: Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden. Dieser Beitrag ist aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
Document Type: article
Publishing status: publishedVersion
Issue Date: 2016
Appears in Collections:Fakultät für Maschinenbau

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pos. country downloads
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1 image of flag of Germany Germany 51 83.61%
2 image of flag of United States United States 3 4.92%
3 image of flag of Portugal Portugal 2 3.28%
4 image of flag of China China 2 3.28%
5 image of flag of Korea, Republic of Korea, Republic of 1 1.64%
6 image of flag of Japan Japan 1 1.64%
7 image of flag of France France 1 1.64%

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