Evaluation of leakage through labyrinth seals with analytical models

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dc.contributor.authorSzymański, Artur
dc.contributor.authorDykas, Sławomir
dc.date.accessioned2019-11-26T16:17:36Z
dc.date.available2019-11-26T16:17:36Z
dc.date.issued2019-01-03
dc.description.abstractSecondary flows in turbo machinery highly affect the overall efficiency and rotor stability. A prime example of such a phenomenon are leakage flows. Despite their complexity,they can often be estimated with simple semi-empirical formulae, solved with hand calculations.Such an approach is much more cost and time effective during the design process. The formulae consists of a carry-over coefficient and a discharge coefficient elements. To evaluate the leakage properly, an adequate model of the carry-over coefficient has to be developed. This paper presents show the flow conditions and the cavity geometry changes in a straight through labyrinth seal affect the amount of leakage. The effect of the number of teeth, the gap size, the Reynolds number and the pressure ratio are considered. The data to validate the results was obtained from an in-house experiment, where a vast number of cases was tested. Additionally, the study was supported by a two-dimensional steady-state CFD study. Eleven analytical models,Including both very simple as well as more sophisticated methods, were solved according to the experimental case and compared. Six different seal configurations were examined. They included straight through seals with two and three straight knives for various gap sizes.The comparison highlighted differences in the results for models – a certain group presented underestimated results. However, another group of models – presented an excellent agreement with the experimental data. Based on this study, a group of models representing the results within the 10% uncertainty band was selected.en_UK
dc.identifier.citationSzymanski A, Dykas S. Evaluation of leakage through labyrinth seals with analytical models. TASK Quarterly, Volume 23, Issue 1, 2019, pp. 61-79en_UK
dc.identifier.issn1428-6394
dc.identifier.urihttps://doi.org/10.17466/tq2019/23.1/f
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/14768
dc.language.isoenen_UK
dc.publisherCentre of Informatics, Tri-City Academic Supercomputer and networKen_UK
dc.rightsAttribution-NonCommercial 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/*
dc.subjectlabyrinth sealsen_UK
dc.subjectturbomachineryen_UK
dc.subjectgas turbineen_UK
dc.subjectanalytical methodsen_UK
dc.subjectvalidationen_UK
dc.titleEvaluation of leakage through labyrinth seals with analytical modelsen_UK
dc.typeArticleen_UK

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