Type of Document Dissertation Author Santos, Maria Madruga Author's Email Address email@example.com URN etd-01302005-121318 Title Experimental Study on Counter Flow Thrust Vectoring of a Gas Turbine Engine Degree Doctor of Philosophy Department Mechanical Engineering, Department of Advisory Committee
Advisor Name Title Anjaneyulu Krothapalli Committee Co-Chair Luis Lourenco Committee Co-Chair Farrukh Alvi Committee Member Namas Chandra Committee Member Srinivas Palanki Committee Member Keywords
- Gas Turbine Engines
- Counter Flow
- Turbulent Jets
- Thrust Vectoring
Date of Defense 2004-12-09 Availability unrestricted AbstractCounter flow thrust vectoring was successfully applied to a real engine for the first time.
The study begins with a characterization of the jet supplied by the engine, with a rectangular nozzle with an aspect ratio of 2. For 80,000 RPM, a detailed characterization of the free jet flow field is presented. Results include Schlieren visualization and PIV measurements in both centerline streamwise planes. The jet potential core was seen to be 2.5 nozzle heights and an asymmetry in the flow was observed in both planes. The jet is fully turbulent from the nozzle exit.
Counter flow thrust vectoring tests were conducted, in the early stage of the investigation, for gap heights ranging from 0.25 to 0.75 nozzle heights. The database thus obtained served as a guideline to choose the gap corresponding to G/h=0.625 for detailed analysis of the flow field. Vectoring angles higher than 30 degrees, without jet attachment, were observed. Thrust losses were less than 8%.
For the selected gap, Schlieren visualization and PIV measurements were performed for two different configurations: with and without side plates covering the sides of the collar. Increased vectoring proved to decrease the jet's potential core and increase the thickness of the shear layers. It also increased the turbulence intensities in the collar region. The removal of the side plates prevented attachment, decreased the maximum vectoring angle and increased the secondary flow requirements.
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28.8 Modem 56K Modem ISDN (64 Kb) ISDN (128 Kb) Higher-speed Access 00_preliminaries.pdf 447.94 Kb 00:02:04 00:01:03 00:00:55 00:00:27 00:00:02 01_Chapter1.pdf 230.18 Kb 00:01:03 00:00:32 00:00:28 00:00:14 00:00:01 02_Chapter2.pdf 1.94 Mb 00:08:57 00:04:36 00:04:02 00:02:01 00:00:10 03_Chapter3.pdf 3.41 Mb 00:15:45 00:08:06 00:07:05 00:03:32 00:00:18 04_Chapter4.pdf 5.42 Mb 00:25:06 00:12:54 00:11:18 00:05:39 00:00:28 05_Chapter5.pdf 33.84 Kb 00:00:09 00:00:04 00:00:04 00:00:02 < 00:00:01 06_AppendixA.pdf 235.21 Kb 00:01:05 00:00:33 00:00:29 00:00:14 00:00:01 07_AppendixB.pdf 2.43 Mb 00:11:14 00:05:46 00:05:03 00:02:31 00:00:12 08_AppendixC.pdf 69.98 Kb 00:00:19 00:00:09 00:00:08 00:00:04 < 00:00:01 09_bibliography.pdf 25.39 Kb 00:00:07 00:00:03 00:00:03 00:00:01 < 00:00:01