Encounters with Vortices in a Turbine Nozzle Passage
Experiments were conducted on the flow through a transonic turbine cascade. Secondary flows and a wide range of vortex types were encountered, including horseshoe vortices, shock-induced passage vortices, and streamwise vortices on the suction surface. In the separation region on the suction surface...
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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/10.1155/2012/928623 |
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| author | J. P. Gostelow A. Mahallati W. E. Carscallen A. Rona |
| author_facet | J. P. Gostelow A. Mahallati W. E. Carscallen A. Rona |
| author_sort | J. P. Gostelow |
| collection | DOAJ |
| description | Experiments were conducted on the flow through a transonic turbine cascade. Secondary flows and a wide range of vortex types were encountered, including horseshoe vortices, shock-induced passage vortices, and streamwise vortices on the suction surface. In the separation region on the suction surface, a large rollup of passage vorticity occurred. The blunt leading edge gave rise to strong horseshoe vortices and secondary flows. The suction surface had a strong convex curvature over the forward portion and was quite flat further downstream. Surface flow visualization was performed and this convex surface displayed coherent streamwise vorticity. At subsonic speeds, strong von Kármán vortex shedding resulted in a substantial base pressure deficit. For these conditions, time-resolved measurements were made of the Eckert-Weise energy separation in the blade wake. At transonic speeds, exotic shedding modes were observed. These phenomena all occurred in experiments on the flow around one particular turbine nozzle vane in a linear cascade. |
| format | Article |
| id | doaj-art-f051dfe2e11b4b2e92d8f6cc66754921 |
| 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-f051dfe2e11b4b2e92d8f6cc667549212025-02-03T07:24:51ZengWileyInternational Journal of Rotating Machinery1023-621X1542-30342012-01-01201210.1155/2012/928623928623Encounters with Vortices in a Turbine Nozzle PassageJ. P. Gostelow0A. Mahallati1W. E. Carscallen2A. Rona3Department of Engineering, University of Leicester, University Road, Leicester LE1 7RH, UKNational Research Council of Canada, Ottawa, ON, K1A 0R6, CanadaNational Research Council of Canada, Ottawa, ON, K1A 0R6, CanadaDepartment of Engineering, University of Leicester, University Road, Leicester LE1 7RH, UKExperiments were conducted on the flow through a transonic turbine cascade. Secondary flows and a wide range of vortex types were encountered, including horseshoe vortices, shock-induced passage vortices, and streamwise vortices on the suction surface. In the separation region on the suction surface, a large rollup of passage vorticity occurred. The blunt leading edge gave rise to strong horseshoe vortices and secondary flows. The suction surface had a strong convex curvature over the forward portion and was quite flat further downstream. Surface flow visualization was performed and this convex surface displayed coherent streamwise vorticity. At subsonic speeds, strong von Kármán vortex shedding resulted in a substantial base pressure deficit. For these conditions, time-resolved measurements were made of the Eckert-Weise energy separation in the blade wake. At transonic speeds, exotic shedding modes were observed. These phenomena all occurred in experiments on the flow around one particular turbine nozzle vane in a linear cascade.http://dx.doi.org/10.1155/2012/928623 |
| spellingShingle | J. P. Gostelow A. Mahallati W. E. Carscallen A. Rona Encounters with Vortices in a Turbine Nozzle Passage International Journal of Rotating Machinery |
| title | Encounters with Vortices in a Turbine Nozzle Passage |
| title_full | Encounters with Vortices in a Turbine Nozzle Passage |
| title_fullStr | Encounters with Vortices in a Turbine Nozzle Passage |
| title_full_unstemmed | Encounters with Vortices in a Turbine Nozzle Passage |
| title_short | Encounters with Vortices in a Turbine Nozzle Passage |
| title_sort | encounters with vortices in a turbine nozzle passage |
| url | http://dx.doi.org/10.1155/2012/928623 |
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