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Technical University of Crete
Technical University of Crete
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| URI | http://purl.tuc.gr/dl/dias/65E3E0F2-BFE2-4DDE-A0A4-3DA0EBC5142B | - |
| Identifier | https://doi.org/10.1115/96-GT-072 | - |
| Language | en | - |
| Title | Modelling of the tip clearance losses in axial flow machines | en |
| Creator | Nikolos Ioannis | en |
| Creator | Νικολος Ιωαννης | el |
| Creator | K. D. Papailiou | en |
| Creator | D. I. Douvikas | en |
| Publisher | American Society of Mechanical Engineers | en |
| Content Summary | The 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 Item | Πλήρης Δημοσίευση σε Συνέδριο | el |
| Type of Item | Conference Full Paper | en |
| License | http://creativecommons.org/licenses/by/4.0/ | en |
| Date of Item | 2015-11-04 | - |
| Date of Publication | 1996 | - |
| Bibliographic Citation | I. 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-072 | en |
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