Tips for Abstracts and Presentations

1Advisor: Prof. Jesse LittleModification of a High-Speed Jet for Study of Active Flow ControlDepartment of Aerospace and Mechanical EngineeringNicolas UriasArizona Space Grant Consortium SymposiumApril 12th, 2014Tucson, AZ

IntroductionHigh speed jet located inside anechoic chamberOperated by high pressure tanks Initial pressure of 1750 psiSystem drops pressure to 300 psi in settling chamber

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Lucas 2011

Active Flow Control BackgroundControl of turbulent jet structuresActuators are installed along the inside wall of diffuserAllows some control of where the fluid attaches to wall of diffuserThrust Vectoring in aircraft/spacecraft3Pack and Seifert 2001

Circle to Square Transition BlockDesigned to fit existing jet facilityConverts circular flow to simplified 2D flowSimpler to install actuators Had to match existing internal jet nozzle exit angleRequired many measurements

4Circle to Square Transition BlockSquare had to fit inside circle to be machinableDesigned using SolidWorks to obtain high machined precision Contours of the part could NOT be produced with traditional machining toolsOutsourced machining work to specialists5How about mentioning some of the design criteria (pressure, area change, length, etc.).5Part could only be wire electric discharged machined (Wire EDM).High tolerances could be achieved (ten thousandth of an inch)Required clearance for wire inside partPart was to be made of Stainless SteelVery durable and easily machinedCould handle the weight of all other flow control components attached to the downstream end

Circle to Square Transition Block66Wire EDM7

Illustration of Contours

88Issues with DesignWire EDM machinist could not get exact contours of adapter blockSolidWorks Education Edition not suitable for high-quality .DXF exportationVirtually no way to program wire EDM machine to produce the exact part required9Issues with Design

Dramatized contour showing discontinuity10Test Apparatus SetupA flat plate mounts to C-S transition block2D diffuser mounts to the flat plateActuators inserted into diffuser coneCan achieve thrust vectoring and noise reduction in nozzle exhausts1111

Test Apparatus SetupInletFlat plateDiffuser coneActuator locationOutlet1212Test Apparatus Setup

13Future TasksFinding a solution for the SolidWorks to .DXF conversion issueUse NX Nastran softwareDesigned for aerospace companiesDesign internal cavities for actuatorsDesign diffuser cone

1414Thank you!!The NASA Space GrantThe A.F.S.O.R. &Special thanks Dr. Lutz Taubert, whom helped me with every aspect of this design project.

1515ReferencesPack, Latunia G., and Avi Seifert. "Periodic Excitation for Jet Vectoring and Enhanced Spreading."Journal of Aircraft38.3 (2001): 486-95. Print.Lucas, Nathaniel.IMPROVING FLOW RATE CONTROL FOR A SUPERSONIC TWIN NOZZLE AND REDUCING NOISE WITH FLEXIBLE FILAMENTS. Thesis. University of Arizona, 2011. N.p.: n.p., n.d. Print.

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