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  • 1980-1984  (6)
  • 1
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    Flow visualization study of the horseshoe vortex in a turbine stator cascade (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Flow visualization techniques were used to show the behavior of the horseshoe vortex in a large scale turbine stator cascade. Oil drops on the end wall surface flowed in response to local shear stresses, indicating the limiting flow streamlines at the surface. Smoke injected into the flow and photographed showed time averaged flow behavior. Neutrally bouyant helium filled soap bubbles followed the flow and showed up on photographs as streaks, indicating the paths followed by individual fluid particles. Preliminary attempts to control the vortex were made by injecting air through control jets drilled in the end wall near the vane leading edge. Seventeen different hole locations were tested, one at a time, and the effect of the control jets on the path follwed by smoke in the boundary layer was recorded photographically.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TP-1884 , E-915 , NAS 1.60:1884
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Comparison of visualized turbine endwall secondary flows and measured heat transfer patterns (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Various flow visualization techniques were used to define the seondary flows near the endwall in a large heat transfer data. A comparison of the visualized flow patterns and the measured Stanton number distribution was made for cases where the inlet Reynolds number and exit Mach number were matched. Flows were visualized by using neutrally buoyant helium-filled soap bubbles, by using smoke from oil soaked cigars, and by a few techniques using permanent marker pen ink dots and synthetic wintergreen oil. Details of the horseshoe vortex and secondary flows can be directly compared with heat transfer distribution. Near the cascade entrance there is an obvious correlation between the two sets of data, but well into the passage the effect of secondary flow is not as obvious. Previously announced in STAR as N83-14435
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: ASME PAPER 83-GT-83 , ASME, Transactions, Journal of Engineering for Gas Turbines and Power (ISSN 0022-0825); 106; 168-172
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Evaluation of a method for heat transfer measurements and thermal visualization using a composite of a heater element and liquid crystals (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Commercially available elements of a composite consisting of a plastic sheet coated with liquid crystal, another sheet with a thin layer of a conducting material (gold or carbon), and copper bus bar strips were evaluated and found to provide a simple, convenient, accurate, and low-cost measuring device for use in heat transfer research. The particular feature of the composite is its ability to obtain local heat transfer coefficients and isotherm patterns that provide visual evaluation of the thermal performances of turbine blade cooling configurations. Examples of the use of the composite are presented.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ASME PAPER 81-GT-93 , Gas Turbine Conference and Products Show; Mar 09, 1981 - Mar 12, 1981; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Evaluation of a method for heat transfer measurements and thermal visualization using a composite of a heater element and liquid crystals (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Commercially available elements of a composite consisting of a plastic sheet coated with liquid crystal, another sheet with a thin layer of a conducting material (gold or carbon), and copper bus bar strips were evaluated and found to provide a simple, convenient, accurate, and low-cost measuring device for use in heat transfer research. The particular feature of the composite is its ability to obtain local heat transfer coefficients and isotherm patterns that provide visual evaluation of the thermal performances of turbine blade cooling configurations. Examples of the use of the composite are presented.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-81639 , E-656 , Ann. Intern. Gas Turbine Conf.; Mar 08, 1981 - Mar 12, 1981; Houston, TX; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Unknown
    Comparison of visualized turbine endwall secondary flows and measured heat transfer patterns (1983)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Various flow visualization techniques were used to define the secondary flows near the endwall in a large heat transfer data. A comparison of the visualized flow patterns and the measured Stanton number distribution was made for cases where the inlet Reynolds number and exit Mach number were matched. Flows were visualized by using neutrally buoyant helium-filled soap bubbles, by using smoke from oil soaked cigars, and by a few techniques using permanent marker pen ink dots and synthetic wintergreen oil. Details of the horseshoe vortex and secondary flows can be directly compared with heat transfer distribution. Near the cascade entrance there is an obvious correlation between the two sets of data, but well into the passage the effect of secondary flow is not as obvious.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-83016 , E-1450 , NAS 1.15:83016 , Ann. Intern. Gas Turbine Conf.; Mar 27, 1983 - Mar 31, 1983; Phoenix, AZ; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Streakline flow visualization study of a horseshoe vortex in a large-scale, two-dimensional turbine stator cascade (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Neutrally buoyant helium-filled bubbles were observed as they followed the streamlines in a horseshoe vortex system around the vane leading edge in a large-scale, two-dimensional, turbine stator cascade. Bubbles were introduced into the endwall boundary layer through a slot upstream of the vane leading edge. The paths of the bubbles were recorded photographically as streaklines on 16-mm movie film. Individual frames from the film have been selected, and overlayed to show the details of the horseshoe vortex around the leading edge. The transport of the vortex across the passage near the leading edge is clearly seen when compared to the streaks formed by bubbles carried in the main stream. Limiting streamlines on the endwall surface were traced by the flow of oil drops.
    Keywords: AERODYNAMICS
    Type: ASME PAPER 80-GT-4 , Gas Turbine Conference and Products Show; Mar 10, 1980 - Mar 13, 1980; New Orleans, LA
    Format: text
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