Sobota, Thomas H. and Marble, Frank E. (1987) An Experimental and Numerical Investigation of Swirling Flows in a Rectangular Nozzle. AIAA Papers, AIAA-87-2108. American Institute of Aeronautics and Astronautics . http://resolver.caltech.edu/CaltechAUTHORS:20101203-145603258
- Published Version
See Usage Policy.
Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20101203-145603258
The high thrust to weight ratios now possible for military aircraft have made thrust vector pitch control more attractive and versatile than aerodynamic surface pitch control. Use of a rectangular nozzle is a natural consequence because articulation and sealing problems are less formidable than for conventional circular ones. The rectangular nozzle offers the additional possibility that the exhaust may mix rapidly with the ambient air and thereby reduce the radiative signature of the exhaust. A detailed experimental investigation is described, which demonstrates that the formation of axial vortices in the nozzle is dependent on the vorticity distribution at the turbine exhaust. Further, three mechanisms which provide for the formation of axial vortices are identified. A parallel computational investigation was carried out which not only confirmed the relationship between the turbine exhaust vorticity and the vortex pattern formed in the nozzle but also provided details of the flow field between the turbine discharge and the nozzle exit. On the basis of this more detailed understanding, it is now possible to tailor the vortex distribution at the nozzle exit by design of the turbine discharge and the intervening passage.
|Item Type:||Report or Paper (Report)|
|Additional Information:||© American Institute of Aeronautics and Astronautics, Inc., 1987.|
|Group:||Guggenheim Jet Propulsion Center|
|Other Numbering System:|
|Official Citation:||An Experimental and Numerical Investigation of Swirling Flows in a Rectangular Nozzle, Thomas H. Sobota and Frank E. Marble, AIAA-87-2108, Presented at the 23rd Joint Propulsion Conference, June 1987.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||13 Dec 2010 18:54|
|Last Modified:||26 Dec 2012 12:43|
Repository Staff Only: item control page