Linear stability analysis of the flow around natural laminar flow airfoils

Rajani, BN and Mittal, Naveen and Govindrajan, Rama (1995) Linear stability analysis of the flow around natural laminar flow airfoils. Technical Report. National Aerospace Laboratories, Bangalore, India.

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    Abstract

    Linear stability computations over airfoils play an important role in the design of natural laminar flow airfoils - in reducing the risk of a massive separation by the elimination of excess acceleration upstream while maintaining laminar flow; and in the prediction of the onset of transition to turbulence. This report describes a linear stability code developed at CTFD, NAL for airfoil analysis. The code is validated against known results for NASA DESB159 airfoil. Disturbance amplification factors are computed for (i)a Wortmann FX-63-137 airfoil at an angle-of-attack alpha=o deg for Reynolds numbers of 80,000, 0.2 million and 2 million; (ii) a GAW-2 13% airfoil at alpha=0 deg and Reynolds number equal to 60 million. Finally, an en correlation for transition onset is discussed briefly.

    Item Type: Proj.Doc/Technical Report (Technical Report)
    Uncontrolled Keywords: linear stability;amplification ratio;transition;boundary layer;laminar airfoils
    Subjects: ENGINEERING > Fluid Mechanics and Thermodynamics
    Division/Department: Computational and Theoretical Fluid Dynamics Division, Computational and Theoretical Fluid Dynamics Division, Computational and Theoretical Fluid Dynamics Division
    Depositing User: Smt Bhagya Rekha KA
    Date Deposited: 28 Jan 2006
    Last Modified: 24 May 2010 09:39
    URI: http://nal-ir.nal.res.in/id/eprint/933

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