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  • 1
    Electronic Resource
    Electronic Resource
    Full field flow visualization and computer-aided velocity measurements in a bank of cylinders in a wind tunnel (1992)
    Springer
    Experiments in fluids 13 (1992), S. 117-127 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The full field flow tracking (FFFT) method that is presented in this paper uses a laser-generated, mechanically strobed planar sheet of light, a low luminosity TV camera coupled with a long distance microscope, and a computer-controlled videorecorder to study non-intrusively and qualitatively the flow structures in a bank of cylinders that are placed in a wind tunnel. This setup simulates an upscale version of the geometry of internal cooling passageways characteristic of small air-cooled radial turbines. The qualitative images supplied by the FFFT system are processed by means of a computer-integrated image quantification (CIIQ) method into quantitative information, trajectories and velocities, that describes the flow upstream of and within the bank of cylinders. The tracking method is lagrangian in concept, and permits identification and tracking of the same particle, thus facilitating construction of time dependent trajectories and the calculation of true velocities and accelerations. The error analysis evaluates the accuracy with which the seed particles follow the flow and the errors incurred during the quantitative processing of the raw data derived from the FFFT/ CIIQ method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00218157
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Full field flow visualization and computer-aided velocity measurements in a bank of cylinders in a wind tunnel (1992)
    Springer
    Details
    Publication Date: 1992-06-01
    Print ISSN: 0723-4864
    Electronic ISSN: 1432-1114
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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    PAPER CURRENT
  • 3
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    Flow visualization in a single simulated brush seal (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A method to visualize and characterize the complex flow fields in brush seals is presented. A configuration characteristic of the brush seal confined in a two-dimensional tunnel with water as the working fluid was studied. Visualization of the flow field revealed regions that are characteristically jetting, vortical, and crossflow and exist upstream, downstream or within the seal. Such flows are engendered by variations in fiber void that are spatial and temporal and affect changes in seal leakage and stability. While the effects of interface motion and cylindrical configuration have not been considered herein, it is believed that the observed flow fields characterize flow phenomenology in brush seals.
    Keywords: MECHANICAL ENGINEERING
    Type: In: Rotating machinery - Dynamics; Proceedings of the 3rd International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC-3), Honolulu, HI, Apr. 1-4, 1990 (A93-54651 24-37); p. 161-175.
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Flow visualization and motion analysis for a series of four sequential brush seals (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Applying the Full Flow Field Tracking (FFFT) method, the flow patterns and the accompanying fluid velocities inside a series of brushes were nonintrusively determined and graphically reconstructed. The visualized flow field revealed regions that are characteristically river-jetting, vortical, and crossflow, and exist upstream, downstream, or within the seal. These flows are especially engendered by variations in fiber void that are spatial and temporal and affect changes in seal leakage and stability. The deformation of the upper half of each of the four sequential brushes as a function of upstream pressure and mass flow was determined. The axial pressure variation across the set of four brushes and the mass flow as a function of the pressure drops are also presented.
    Keywords: MECHANICAL ENGINEERING
    Type: AIAA PAPER 90-2482
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Flow visualization and motion analysis for a series of four sequential brush seals (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Keywords: MECHANICAL ENGINEERING
    Type: Journal of Propulsion and Power (ISSN 0748-4658); 8; 3 Ma; 697-702
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Full field flow visualization and computer-aided velocity measurements in a bank of cylinders in a wind tunnel (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The full field flow tracking (FFFT) method that is presented in this paper uses a laser-generated, mechanically strobed planar sheet of light, a low luminosity TV camera coupled with a long distance microscope, and a computer-controlled video recorder to study nonintrusively and qualitatively the flow structures in a bank of cylinders that are placed in a wind tunnel. This setup simulates an upscale version of the geometry of internal cooling passageways characteristic of small air-cooled radial turbines. The qualitative images supplied by the FFFT system are processed by means of a computer-integrated image quantification (CIIQ) method into quantitative information, trajectories and velocities, that describe the flow upstream of and within the bank of cylinders. The tracking method is Lagrangian in concept, and permits identification and tracking of the same particle, thus facilitating construction of time dependent trajectories and the calculation of true velocities and accelerations. The error analysis evaluates the accuracy with which the seed particles follow the flow and the errors incurred during the quantitative processing of the raw data derived from the FFFT/CIIQ method.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Experiments in Fluids (ISSN 0723-4864); 13; 3-Feb
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Flow visualization and quantitative velocity and pressure measurements in simulated single and double brush seals (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A method to visualize and characterize the complex flow fields in simulated single and double brush seals is presented. The brush seal configuration was tested in a gravity fed water tunnel and a pump driven pressurized oil tunnel. Visualization of the flow field revealed regions that are characteristically river jetting, vortical, crossflow and exist upstream, downstream or within the seal. Such flows are especially engendered by variations in fiber void that are spatial and temporal and affect changes in seal leakage and stability. While the effects of interface motion and cylindrical configuration have not been considered herein, it is believed that the observed flow fields and pressure drop patterns characterize flow phenomenology in brush seals. The axial pressure profiles upstream, across and downstream of the brush have been measured under a variety of inlet pressure conditions and the ensuing pressure maps are presented and discussed. Through the application of the Full Flow Field Tracking method developed by the authors, the flow patterns and the accompanying fluid velocities inside the brush were non-intrusively determined and graphically reconstructed.
    Keywords: MECHANICAL ENGINEERING
    Type: STLE Tribology Transactions (ISSN 0569-8197); 34; 70-80
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    A laser based computer aided non-intrusive technique for full field flow characterization in macroscopic curved channels (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper presents the application of a laser based, computer aided image processing technique for the nonintrusive evaluation of field velocities and accelerations in a 180 deg curved channel geometry, characteristic of inlet passages of the cowls of airbreathing aircraft engines. The method based on the illumination of the test section with a laser generated planar sheet of light, allows microscopic or macroscopic surveillance of fluid flow across or along large cross sections for relatively long (greater than 1 sec) periods of time. The method is Lagrangian in concept and permits identification and tracking of the same particle, thus facilitating construction of more comprehensive trajectories and the calculation of velocities and accelerations.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Flow Visualization - 1989; Dec 10, 1989 - Dec 15, 1989; San Francisco, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
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