Full-coverage film cooling. Part 1. Three-dimensional measurements of turbulence structure

Savas Yavuzkurt, R. J. Moffat, W. M. Kays

    Research output: Contribution to journalArticle

    39 Citations (Scopus)

    Abstract

    Hydrodynamic measurements were made with a triaxial hot wire in the full-coverage region and the recovery region following an array of injection holes inclined downstream, at 30° to the surface. The data were taken under isothermal conditions at ambient temperature and pressure for two blowing ratios: M = 0·9 and M = 0·4. (The ratio M = ρjet UjetU, where U is the mean velocity and ρ is the density. Subscripts jet and ∞ stand for injectant and free stream, respectively.) Profiles of the three mean-velocity components and the six Reynolds stresses were obtained at several spanwise positions at each of five locations down the test plate. In the full-coverage region, high levels of turbulence kinetic energy (TKE) were found for low blowing and low TKE levels for high blowing. This observation is especially significant when coupled with the fact that the heat transfer coefficient is high for high blowing, and low for low blowing. This apparent paradox can be resolved by the hypothesis that entrainment of the mainstream fluid must be more important than turbulent mixing in determining the heat transfer behaviour at high blowing ratios (close to unity). In the recovery region, the flow can be described in terms of a two-layer model: an outer boundary layer and a two-dimensional inner boundary layer. The inner layer governs the heat transfer.

    Original languageEnglish (US)
    Pages (from-to)129-158
    Number of pages30
    JournalJournal of Fluid Mechanics
    Volume101
    Issue number1
    DOIs
    StatePublished - Jan 1 1980

    Fingerprint

    film cooling
    dimensional measurement
    blowing
    Blow molding
    Turbulence
    turbulence
    Cooling
    Kinetic energy
    boundary layers
    Boundary layers
    kinetic energy
    heat transfer
    recovery
    low turbulence
    Heat transfer
    Recovery
    turbulent mixing
    free flow
    Reynolds stress
    paradoxes

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

    Cite this

    Yavuzkurt, Savas ; Moffat, R. J. ; Kays, W. M. / Full-coverage film cooling. Part 1. Three-dimensional measurements of turbulence structure. In: Journal of Fluid Mechanics. 1980 ; Vol. 101, No. 1. pp. 129-158.
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    abstract = "Hydrodynamic measurements were made with a triaxial hot wire in the full-coverage region and the recovery region following an array of injection holes inclined downstream, at 30° to the surface. The data were taken under isothermal conditions at ambient temperature and pressure for two blowing ratios: M = 0·9 and M = 0·4. (The ratio M = ρjet Ujet/ρ∞U∞, where U is the mean velocity and ρ is the density. Subscripts jet and ∞ stand for injectant and free stream, respectively.) Profiles of the three mean-velocity components and the six Reynolds stresses were obtained at several spanwise positions at each of five locations down the test plate. In the full-coverage region, high levels of turbulence kinetic energy (TKE) were found for low blowing and low TKE levels for high blowing. This observation is especially significant when coupled with the fact that the heat transfer coefficient is high for high blowing, and low for low blowing. This apparent paradox can be resolved by the hypothesis that entrainment of the mainstream fluid must be more important than turbulent mixing in determining the heat transfer behaviour at high blowing ratios (close to unity). In the recovery region, the flow can be described in terms of a two-layer model: an outer boundary layer and a two-dimensional inner boundary layer. The inner layer governs the heat transfer.",
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    Full-coverage film cooling. Part 1. Three-dimensional measurements of turbulence structure. / Yavuzkurt, Savas; Moffat, R. J.; Kays, W. M.

    In: Journal of Fluid Mechanics, Vol. 101, No. 1, 01.01.1980, p. 129-158.

    Research output: Contribution to journalArticle

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    AB - Hydrodynamic measurements were made with a triaxial hot wire in the full-coverage region and the recovery region following an array of injection holes inclined downstream, at 30° to the surface. The data were taken under isothermal conditions at ambient temperature and pressure for two blowing ratios: M = 0·9 and M = 0·4. (The ratio M = ρjet Ujet/ρ∞U∞, where U is the mean velocity and ρ is the density. Subscripts jet and ∞ stand for injectant and free stream, respectively.) Profiles of the three mean-velocity components and the six Reynolds stresses were obtained at several spanwise positions at each of five locations down the test plate. In the full-coverage region, high levels of turbulence kinetic energy (TKE) were found for low blowing and low TKE levels for high blowing. This observation is especially significant when coupled with the fact that the heat transfer coefficient is high for high blowing, and low for low blowing. This apparent paradox can be resolved by the hypothesis that entrainment of the mainstream fluid must be more important than turbulent mixing in determining the heat transfer behaviour at high blowing ratios (close to unity). In the recovery region, the flow can be described in terms of a two-layer model: an outer boundary layer and a two-dimensional inner boundary layer. The inner layer governs the heat transfer.

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