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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-
Αναγνωριστικόhttps://doi.org/10.1115/96-GT-072-
Γλώσσαen-
ΤίτλοςModelling of the tip clearance losses in axial flow machinesen
ΔημιουργόςNikolos Ioannisen
ΔημιουργόςΝικολος Ιωαννηςel
ΔημιουργόςK. D. Papailiouen
Δημιουργός D. I. Douvikasen
ΕκδότηςAmerican Society of Mechanical Engineersen
ΠερίληψηThe 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
ΤύποςΠλήρης Δημοσίευση σε Συνέδριοel
ΤύποςConference Full Paperen
Άδεια Χρήσηςhttp://creativecommons.org/licenses/by/4.0/en
Ημερομηνία2015-11-04-
Ημερομηνία Δημοσίευσης1996-
Βιβλιογραφική ΑναφοράI. 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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