Flow visualization study of the inlet vortex phenomenon
July 1981
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| Format: | Technical Report |
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Cambridge, Mass. : Gas Turbine & Plasma Dynamics Laboratory, Massachusetts Institute of Technology, [1981]
2016
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| Online Access: | http://hdl.handle.net/1721.1/104729 |
| _version_ | 1826217952509165568 |
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| author | De Siervi, Francesca |
| author2 | Massachusetts Institute of Technology. Gas Turbine and Plasma Dynamics Laboratory |
| author_facet | Massachusetts Institute of Technology. Gas Turbine and Plasma Dynamics Laboratory De Siervi, Francesca |
| author_sort | De Siervi, Francesca |
| collection | MIT |
| description | July 1981 |
| first_indexed | 2024-09-23T17:11:39Z |
| format | Technical Report |
| id | mit-1721.1/104729 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T17:11:39Z |
| publishDate | 2016 |
| publisher | Cambridge, Mass. : Gas Turbine & Plasma Dynamics Laboratory, Massachusetts Institute of Technology, [1981] |
| record_format | dspace |
| spelling | mit-1721.1/1047292019-04-12T16:17:48Z Flow visualization study of the inlet vortex phenomenon De Siervi, Francesca Massachusetts Institute of Technology. Gas Turbine and Plasma Dynamics Laboratory TJ778.M41 G24 no.159 Flow visualization Vortex-motion Water tunnels Shear flow Boundary layer July 1981 Includes bibliographical references (page 99) The inlet vortex phenomenon was experimentally investigated in a water tunnel, using hydrogen bubble flow visualization techniques. Several inlet ambient flow combinations were studied, including an inlet and ground plane configuration in a known shear as well as an irrotational flow, and a double (twin) inlet configuration in an irrotational flow. This latter situation created a boundary layer free analogue of the ground plane and enabled investigation of inlet vortex formation in flow essentially free of ambient vorticity. The three dimensional inlet flow field and the vortex formation mechanisms were determined by marking material lines and observing their path and deformation as they are convected from a far upstream location into the inlet. Two basic mechanisms of inlet vortex generation were found. For flows possessing a vertical component of ambient vorticity, the amplification of this vorticity as the vortex lines are stretched and drawn into the inlet results in the formation of an inlet vortex. However, an inlet vortex does not require the presence of ambient vorticity to form. It can also be created in an irrotational flow, with an inlet in crosswind. In this situation, it is accompanied by a variation in circulation along the axial length of the inlet. The ratio of inlet velocity to upstream velocity is an important parameter in determining the generation of an inlet vortex for both mechanisms. Air Force Office of Scientific Research Contract F49620-78-C00084 2016-10-06T21:22:14Z 2016-10-06T21:22:14Z 1981 Technical Report http://hdl.handle.net/1721.1/104729 16246371 GT & PDL report ; no. 159 99 pages application/pdf Cambridge, Mass. : Gas Turbine & Plasma Dynamics Laboratory, Massachusetts Institute of Technology, [1981] |
| spellingShingle | TJ778.M41 G24 no.159 Flow visualization Vortex-motion Water tunnels Shear flow Boundary layer De Siervi, Francesca Flow visualization study of the inlet vortex phenomenon |
| title | Flow visualization study of the inlet vortex phenomenon |
| title_full | Flow visualization study of the inlet vortex phenomenon |
| title_fullStr | Flow visualization study of the inlet vortex phenomenon |
| title_full_unstemmed | Flow visualization study of the inlet vortex phenomenon |
| title_short | Flow visualization study of the inlet vortex phenomenon |
| title_sort | flow visualization study of the inlet vortex phenomenon |
| topic | TJ778.M41 G24 no.159 Flow visualization Vortex-motion Water tunnels Shear flow Boundary layer |
| url | http://hdl.handle.net/1721.1/104729 |
| work_keys_str_mv | AT desiervifrancesca flowvisualizationstudyoftheinletvortexphenomenon |