Full-coverage film cooling. Part 2. Prediction of the recovery-region hydrodynamics

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

    Research output: Contribution to journalArticle

    13 Citations (Scopus)

    Abstract

    Hydrodynamic data are reported in the companion paper (Yavuzkurt, Moffat & Kays 1980) for a full-coverage film-cooling situation, both for the blown and the recovery regions. Values of the mean velocity, the turbulent shear stress, and the turbulence kinetic energy were measured at various locations, both within the blown region and in the recovery region. The present paper is concerned with an analysis of the recovery region only. Examination of the data suggested that the recovery-region hydrodynamics could be modelled by considering that a new boundary layer began to grow immediately after the cessation of blowing. Distributions of the Prandtl mixing length were calculated from the data using the measured values of mean velocity and turbulent shear stresses. The mixing-length distributions were consistent with the notion of a dual boundary-layer structure in the recovery region. The measured distributions of mixing length were described by using a piecewise continuous but heuristic fit, consistent with the concept of two quasi-independent layers suggested by the general appearance of the data. This distribution of mixing length, together with a set of otherwise normal constants for a two-dimensional boundary layer, successfully predicted all of the observed features of the flow. The program used in these predictions contains a one-equation model of turbulence, using turbulence kinetic energy with an algebraic mixing length. The program is a two-dimensional, finite-difference program capable of predicting the mean velocity and turbulence kinetic energy profiles based upon initial values, boundary conditions, and a closure condition.

    Original languageEnglish (US)
    Pages (from-to)159-178
    Number of pages20
    JournalJournal of Fluid Mechanics
    Volume101
    Issue number1
    DOIs
    StatePublished - Jan 1 1980

    Fingerprint

    film cooling
    Hydrodynamics
    recovery
    hydrodynamics
    Cooling
    Recovery
    Turbulence
    turbulence
    Kinetic energy
    predictions
    Boundary layers
    kinetic energy
    shear stress
    Shear stress
    boundary layers
    two dimensional boundary layer
    blowing
    Blow molding
    closures
    examination

    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 2. Prediction of the recovery-region hydrodynamics. In: Journal of Fluid Mechanics. 1980 ; Vol. 101, No. 1. pp. 159-178.
    @article{714d0d07c9344f8abb2ddfa6dcabce93,
    title = "Full-coverage film cooling. Part 2. Prediction of the recovery-region hydrodynamics",
    abstract = "Hydrodynamic data are reported in the companion paper (Yavuzkurt, Moffat & Kays 1980) for a full-coverage film-cooling situation, both for the blown and the recovery regions. Values of the mean velocity, the turbulent shear stress, and the turbulence kinetic energy were measured at various locations, both within the blown region and in the recovery region. The present paper is concerned with an analysis of the recovery region only. Examination of the data suggested that the recovery-region hydrodynamics could be modelled by considering that a new boundary layer began to grow immediately after the cessation of blowing. Distributions of the Prandtl mixing length were calculated from the data using the measured values of mean velocity and turbulent shear stresses. The mixing-length distributions were consistent with the notion of a dual boundary-layer structure in the recovery region. The measured distributions of mixing length were described by using a piecewise continuous but heuristic fit, consistent with the concept of two quasi-independent layers suggested by the general appearance of the data. This distribution of mixing length, together with a set of otherwise normal constants for a two-dimensional boundary layer, successfully predicted all of the observed features of the flow. The program used in these predictions contains a one-equation model of turbulence, using turbulence kinetic energy with an algebraic mixing length. The program is a two-dimensional, finite-difference program capable of predicting the mean velocity and turbulence kinetic energy profiles based upon initial values, boundary conditions, and a closure condition.",
    author = "Savas Yavuzkurt and Moffat, {R. J.} and Kays, {W. M.}",
    year = "1980",
    month = "1",
    day = "1",
    doi = "10.1017/S0022112080001589",
    language = "English (US)",
    volume = "101",
    pages = "159--178",
    journal = "Journal of Fluid Mechanics",
    issn = "0022-1120",
    publisher = "Cambridge University Press",
    number = "1",

    }

    Full-coverage film cooling. Part 2. Prediction of the recovery-region hydrodynamics. / Yavuzkurt, Savas; Moffat, R. J.; Kays, W. M.

    In: Journal of Fluid Mechanics, Vol. 101, No. 1, 01.01.1980, p. 159-178.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Full-coverage film cooling. Part 2. Prediction of the recovery-region hydrodynamics

    AU - Yavuzkurt, Savas

    AU - Moffat, R. J.

    AU - Kays, W. M.

    PY - 1980/1/1

    Y1 - 1980/1/1

    N2 - Hydrodynamic data are reported in the companion paper (Yavuzkurt, Moffat & Kays 1980) for a full-coverage film-cooling situation, both for the blown and the recovery regions. Values of the mean velocity, the turbulent shear stress, and the turbulence kinetic energy were measured at various locations, both within the blown region and in the recovery region. The present paper is concerned with an analysis of the recovery region only. Examination of the data suggested that the recovery-region hydrodynamics could be modelled by considering that a new boundary layer began to grow immediately after the cessation of blowing. Distributions of the Prandtl mixing length were calculated from the data using the measured values of mean velocity and turbulent shear stresses. The mixing-length distributions were consistent with the notion of a dual boundary-layer structure in the recovery region. The measured distributions of mixing length were described by using a piecewise continuous but heuristic fit, consistent with the concept of two quasi-independent layers suggested by the general appearance of the data. This distribution of mixing length, together with a set of otherwise normal constants for a two-dimensional boundary layer, successfully predicted all of the observed features of the flow. The program used in these predictions contains a one-equation model of turbulence, using turbulence kinetic energy with an algebraic mixing length. The program is a two-dimensional, finite-difference program capable of predicting the mean velocity and turbulence kinetic energy profiles based upon initial values, boundary conditions, and a closure condition.

    AB - Hydrodynamic data are reported in the companion paper (Yavuzkurt, Moffat & Kays 1980) for a full-coverage film-cooling situation, both for the blown and the recovery regions. Values of the mean velocity, the turbulent shear stress, and the turbulence kinetic energy were measured at various locations, both within the blown region and in the recovery region. The present paper is concerned with an analysis of the recovery region only. Examination of the data suggested that the recovery-region hydrodynamics could be modelled by considering that a new boundary layer began to grow immediately after the cessation of blowing. Distributions of the Prandtl mixing length were calculated from the data using the measured values of mean velocity and turbulent shear stresses. The mixing-length distributions were consistent with the notion of a dual boundary-layer structure in the recovery region. The measured distributions of mixing length were described by using a piecewise continuous but heuristic fit, consistent with the concept of two quasi-independent layers suggested by the general appearance of the data. This distribution of mixing length, together with a set of otherwise normal constants for a two-dimensional boundary layer, successfully predicted all of the observed features of the flow. The program used in these predictions contains a one-equation model of turbulence, using turbulence kinetic energy with an algebraic mixing length. The program is a two-dimensional, finite-difference program capable of predicting the mean velocity and turbulence kinetic energy profiles based upon initial values, boundary conditions, and a closure condition.

    UR - http://www.scopus.com/inward/record.url?scp=0018952548&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=0018952548&partnerID=8YFLogxK

    U2 - 10.1017/S0022112080001589

    DO - 10.1017/S0022112080001589

    M3 - Article

    VL - 101

    SP - 159

    EP - 178

    JO - Journal of Fluid Mechanics

    JF - Journal of Fluid Mechanics

    SN - 0022-1120

    IS - 1

    ER -