Characterization of a counterflow thrust vectoring scheme on a gas turbine engine exhaust jet

D. Dores, M. Madruga Santos, A. Krothapalli, L. Lourenço, E. Collins, F. Alvi, Paul J Strykowski

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations


Counterflow thrust vectoring is an innovative technique that uses no movable components to redirect a thrust producing jet. This system relies on fixed curved surfaces and a secondary stream flowing in opposition to the main jet. This paper reports on experimental results of the application of 2-D counterflow tlirust vectoring to the exhaust of a gas turbine engine. Characterization of the jet response to counterflow is presented for different secondary flow gaps. Continuous and proportional control of the jet was demonstrated for vectoring angles up to 25°. The jet attaches to the collar wall for high counterflow levels. The secondary mass flux needed to vector the main jet is less than 6% before attachment, with thrust losses below 8%. The temperature in the vacuum line rises to the point where special caution must be taken when operating electronically controlled valves, which also proved to be affected by pressure losses in the vacuum line. Regarding the system dynamic response, a slew rate of 160°/s was observed. However, the counterflow thrust vectoring system operates in a very inhospitable environment regarding noise and interference, which degrades the measurement for high sampling rates. Based on these results an optimal gap size of 0.625 times the nozzle height was chosen for further studies concerning shear layer mixing enhancement, dynamics and controls.

Original languageEnglish (US)
Title of host publicationCollection of Technical Papers - 3rd AIAA Flow Control Conference
Number of pages12
StatePublished - Dec 11 2006
Event3rd AIAA Flow Control Conference - San Francisco, CA, United States
Duration: Jun 5 2006Jun 8 2006

Publication series

NameCollection of Technical Papers - 3rd AIAA Flow Control Conference


Other3rd AIAA Flow Control Conference
CountryUnited States
CitySan Francisco, CA

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