Type of Document	Dissertation
Author	Santos, Maria Madruga
Author's Email Address	mlmadruga@emfa.pt
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 PIV Turbulent Jets Thrust Vectoring
Date of Defense	2004-12-09
Availability	unrestricted
Abstract Counter 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.
Files	Filename       Size       Approximate Download Time (Hours:Minutes:Seconds)     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