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  • 1
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    Enhanced mixing of multiple supersonic rectangular jets by synchronized screech (1994)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The objective of the present work is to study the mixing characteristics of a linear array of supersonic rectangular jets under conditions of screech synchronization. The screech synchronization at a fully expanded jet Mach number of 1.61 is achieved by a precise adjustment of the internozzle spacing. To our knowledge, such an experiment on the resonant mixing of screech synchronized multiple rectangular jets has not been reported before. The results are compared with the case where the screech was suppressed in the multijet configuration.
    Keywords: AERODYNAMICS
    Type: AIAA Journal (ISSN 0001-1452); 32; 12; p. 2477-2480
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  • 2
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    Flip-flop jet nozzle extended to supersonic flows (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Keywords: AERODYNAMICS
    Type: AIAA Journal (ISSN 0001-1452); 31; 6; p. 1028-1035.
    Format: text
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  • 3
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    A study of auscultatory blood pressures in simulated arteries (1965)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Pulse rate, pressure, and pressure level tested in simulated arteries of pulsating flow system with water-glycerol mixtures and whole steer blood
    Keywords: BIOSCIENCES
    Format: text
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  • 4
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    Reversal in Spreading of a Tabbed Circular Jet Under Controlled Excitation (1997)
    In:  Other Sources
    Details
    Publication Date: 2011-08-23
    Description: Detailed flow field measurements have been carried out for a turbulent circular jet perturbed by tabs and artificial excitation. Two "delta tabs" were placed at the nozzle exit at diametrically opposite locations. The excitation condition involved subharmonic resonance that manifested in a periodic vortex pairing in the near flow field. While the excitation and the tabs independently increased jet spreading, a combination of the two diminished the effect. The jet spreading was most pronounced with the tabs but was reduced when excitation was applied to the tabbed jet. The tabs generated streamwise vortex pairs that caused a lateral spreading of the jet in a direction perpendicular to the plane containing the tabs. The excitation, on the other band, organized the azimuthal vorticity into coherent ring structures whose evolution and pairing also increased entrainment by the jet. In the tabbed case, the excitation produced coherent azimuthal structures that were distorted and asymmetric in shape. The self-induction of these structures produced an effect that opposed the tendency for the lateral spreading of the streamwise vortex pairs. The passage of the distorted vortices, and their pairing, also had a cancellation effect on the time-averaged streamwise vorticity field. These led to the reduction in jet spreading.
    Keywords: Fluid Mechanics and Heat Transfer
    Type: Physics of Fluids; Volume 9; No. 12; 3733-3741
    Format: text
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  • 5
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    Axisymmetric jet forced by fundamental and subharmonic tones (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: ACOUSTICS
    Type: AIAA Journal (ISSN 0001-1452); 29; 1114-112
    Format: text
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  • 6
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    An overview of the essential differences and similarities of system identification techniques (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Information is given in the form of outlines, graphs, tables and charts. Topics include system identification, Bayesian statistical decision theory, Maximum Likelihood Estimation, identification methods, structural mode identification using a stochastic realization algorithm, and identification results regarding membrane simulations and X-29 flutter flight test data.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA. Langley Research Center, Fourth NASA Workshop on Computational Control of Flexible Aerospace Systems, Part 2; p 845-880
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  • 7
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    Visualization of the multiple supersonic jet oscillations by swept focused strobed schlieren technique (1994)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The natural flapping mode oscillations of a multiple rectangular supersonic jet is visualized by the newly developed strobed focusing schlieren technique. Four parallel underexpanded, converging rectangular jets, exhausting into ambient air at a fully expanded Mach number of 1.61 are visualized in this study. This technique clearly shows the oscillations at the natural screech frequency and offers tremendous flexibility in the study of these flow fields.
    Keywords: AERONAUTICS (GENERAL)
    Type: Wichita State Univ., AIAA Techfest 20 Proceedings; 8 p
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  • 8
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    Supersonic Jet Mixing Enhancement due to Natural and Induced Screech (1999)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Outline of presentation are: (1) Review of experimental apparatus. (2) Effect of natural screech of jet mixing; converging nozzle, underexpanded jet and converging-diverging nozzle, design pressure.(3) Effect of induced screech on jet mixing: produced by paddles in shear layers, similar to edge tones, and converging-diverging nozzle, design pressure. (4) Effect of paddles on near-field jet noise. and (5) Concluding remarks.
    Keywords: Aircraft Propulsion and Power
    Type: First NASA/Industry High Speed Research Program Nozzle Symposium; 9-1 - 9-15; NASA/CP-1999-209423
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  • 9
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    Reversal in Spreading of a Tabbed Circular Jet Under Controlled Excitation (1997)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Detailed flow field measurements have been carried out for a turbulent circular jet perturbed by tabs and artificial excitation. Two "delta tabs" were placed at the nozzle exit at diametricall opposite y locations. The excitation condition involved subharmonic resonance that manifested in a periodic vortex pairing in the near flow field. While the excitation and the tabs independently increased jet spreading, a combination of the two diminished the effect. The jet spreading was most pronounced with the tabs but was reduced when excitation was applied to the tabbed jet. The tabs generated streamwise vortex pairs that caused a lateral spreading of the jet in a direction perpendicular to the plane containing the tabs. ne excitation, on the other hand, organized the azimuthal vorticity into coherent ring structures whose evolution and pairing also increased entrainment by the jet. In the tabbed case, the excitation produced coherent azimuthal structures that were distorted and asymmetric in shape. The self-induction of these structures produced an effect that opposed the tendency for the lateral spreading of the streamwise vortex pairs. The passage of the distorted vortices, and their pairing, also had a cancellation effect on the time-averaged streamwise vorticity field. These led to the reduction in jet spreading.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: Physics of Fluids; Volume 9; No. 12; 3733-3741
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  • 10
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    Li-ion cells for terrestrial robots (2003)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Keywords: Cybernetics, Artificial Intelligence and Robotics
    Type: Electrochemical Society Fall Meeting; Orlando, FL; United States
    Format: text
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