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Modelling of the tip clearance losses in axial flow machines

Nikolos Ioannis, K. D. Papailiou, D. I. Douvikas

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URIhttp://purl.tuc.gr/dl/dias/65E3E0F2-BFE2-4DDE-A0A4-3DA0EBC5142B-
Identifierhttps://doi.org/10.1115/96-GT-072-
Languageen-
TitleModelling of the tip clearance losses in axial flow machinesen
CreatorNikolos Ioannisen
CreatorΝικολος Ιωαννηςel
CreatorK. D. Papailiouen
Creator D. I. Douvikasen
PublisherAmerican Society of Mechanical Engineersen
Content SummaryThe possibility of predicting the total pressure loss radial distribution, due to the tip clearance presence, is examined in this paper. Models advanced for the diffusion of a line vortex are used for the simulation of the leakage vortex induced velocity and pressure fields, with sufficient success. The leakage vortex strength seems to control directly only a small part of the total pressure loss distribution, the one connected with the pressure deficit and the rotating flow. The remaining profiles result as functions of a free parameter — the constant of integration — and an assumption is needed to close the problem. The widely proposed observation for lost secondary jet kinetic energy is considered as a method of predicting the total amount of tip clearance loss in successive planes inside and downstream the blade passage. A calculation procedure for predicting the tip clearance effects in the flow field inside and downstream the tip clearance, has been developed. The method, being compatible with a meridional flow calculation procedure, accounts for the calculation of the peripherally mean deficit profiles of the various flow quantities. The predictive capability of the calculation procedure is established in a wide range of test cases, including axial flow compressor cascades, isolated rotors and multi-row machines. The radial variation of tip clearance pressure loss is calculated with sufficient accuracy for engineering purposes.en
Type of ItemΠλήρης Δημοσίευση σε Συνέδριοel
Type of ItemConference Full Paperen
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2015-11-04-
Date of Publication1996-
Bibliographic CitationI. K. Nikolos, D. I. Douvikas, K. D. Papailiou, "Modelling of the Tip Clearance Losses in Axial Flow Machines," in ASME 1996 International Gas Turbine and Aeroengine Congress and Exhibition, 1996. doi: 10.1115/96-GT-072en

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