The role of residual non-turbulent disturbances on 13; transition onset in two-dimensional boundary layers

Govindarajan, Rama and Narasimha, Roddam (1989) The role of residual non-turbulent disturbances on 13; transition onset in two-dimensional boundary layers. Technical Report. National Aeronautical Laboratory, Bangalore, India.

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    Abstract

    An analysis of procedures in current use for prediction of13; transition onset location shows that they are generally in poor agreement with data obtained in test facilities at low free-stream turbulence levels. It has elsewhere been shown that under such conditions transition is driven by residual non-turbulent disturbances in the facility. A13; method is developed here for taking such disturbances into account by defining an equivalent free-stream turbulence intensity; values for this parameter are derived for each facility from which onset data are available. A new correlation incorporating this effect is shown to be in13; good agreement with all available data on two-dimensional flows with pressure gradient. The correlation suggests that the onset Reynolds number (based on boundary layer thickness) depends inversely on the total disturbance level when the latter is low.

    Item Type: Proj.Doc/Technical Report (Technical Report)
    Uncontrolled Keywords: Residual non-turbulent disturbances;Transition onset;13; Pressure gradient parameter;Free-stream turbulence
    Subjects: ENGINEERING > Fluid Mechanics and Thermodynamics
    Division/Department: Computational and Theoretical Fluid Dynamics Division, Fluid Dynamics
    Depositing User: Mr. Ravikumar R
    Date Deposited: 19 Sep 2006
    Last Modified: 24 May 2010 09:50
    URI: http://nal-ir.nal.res.in/id/eprint/2741

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