Data Adaptive Spectral Analysis of Unsteady Leakage Flow in an Axial Turbine
A data adaptive spectral analysis method is applied to characterize the unsteady loss generation in the leakage flow of an axial turbine. Unlike conventional spectral analysis, this method adapts a model dataset to the actual data. The method is illustrated from the analysis of the unsteady wall pre...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2012-01-01
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| Series: | International Journal of Rotating Machinery |
| Online Access: | http://dx.doi.org/10.1155/2012/121695 |
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| author | Konstantinos G. Barmpalias Ndaona Chokani Anestis I. Kalfas Reza S. Abhari |
| author_facet | Konstantinos G. Barmpalias Ndaona Chokani Anestis I. Kalfas Reza S. Abhari |
| author_sort | Konstantinos G. Barmpalias |
| collection | DOAJ |
| description | A data adaptive spectral analysis method is applied to characterize the unsteady loss generation in the leakage flow of an axial turbine. Unlike conventional spectral analysis, this method adapts a model dataset to the actual data. The method is illustrated from the analysis of the unsteady wall pressures in the labyrinth seal of an axial turbine. Spectra from the method are shown to be in good agreement with conventional spectral estimates. Furthermore, the spectra using the method are obtained with data records that are 16 times shorter than for conventional spectral analysis, indicating that the unsteady processes in turbomachines can be studied with substantially shorter measurement schedules than is presently the norm. |
| format | Article |
| id | doaj-art-24d9ebfecc034f82bc1d794b985514d4 |
| institution | Kabale University |
| issn | 1023-621X 1542-3034 |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Rotating Machinery |
| spelling | doaj-art-24d9ebfecc034f82bc1d794b985514d42025-02-03T01:20:12ZengWileyInternational Journal of Rotating Machinery1023-621X1542-30342012-01-01201210.1155/2012/121695121695Data Adaptive Spectral Analysis of Unsteady Leakage Flow in an Axial TurbineKonstantinos G. Barmpalias0Ndaona Chokani1Anestis I. Kalfas2Reza S. Abhari3Laboratory for Energy Conversion (LEC), Swiss Federal Institute of Technology, ETH Zurich, 8092 Zurich, SwitzerlandLaboratory for Energy Conversion (LEC), Swiss Federal Institute of Technology, ETH Zurich, 8092 Zurich, SwitzerlandDepartment of Mechanical Engineering, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, GreeceLaboratory for Energy Conversion (LEC), Swiss Federal Institute of Technology, ETH Zurich, 8092 Zurich, SwitzerlandA data adaptive spectral analysis method is applied to characterize the unsteady loss generation in the leakage flow of an axial turbine. Unlike conventional spectral analysis, this method adapts a model dataset to the actual data. The method is illustrated from the analysis of the unsteady wall pressures in the labyrinth seal of an axial turbine. Spectra from the method are shown to be in good agreement with conventional spectral estimates. Furthermore, the spectra using the method are obtained with data records that are 16 times shorter than for conventional spectral analysis, indicating that the unsteady processes in turbomachines can be studied with substantially shorter measurement schedules than is presently the norm.http://dx.doi.org/10.1155/2012/121695 |
| spellingShingle | Konstantinos G. Barmpalias Ndaona Chokani Anestis I. Kalfas Reza S. Abhari Data Adaptive Spectral Analysis of Unsteady Leakage Flow in an Axial Turbine International Journal of Rotating Machinery |
| title | Data Adaptive Spectral Analysis of Unsteady Leakage Flow in an Axial Turbine |
| title_full | Data Adaptive Spectral Analysis of Unsteady Leakage Flow in an Axial Turbine |
| title_fullStr | Data Adaptive Spectral Analysis of Unsteady Leakage Flow in an Axial Turbine |
| title_full_unstemmed | Data Adaptive Spectral Analysis of Unsteady Leakage Flow in an Axial Turbine |
| title_short | Data Adaptive Spectral Analysis of Unsteady Leakage Flow in an Axial Turbine |
| title_sort | data adaptive spectral analysis of unsteady leakage flow in an axial turbine |
| url | http://dx.doi.org/10.1155/2012/121695 |
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