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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