Aerodynamic characteristics of lifting symmetric supercritical airfoils

Nandanan, M and Ramaswamy, MA (1986) Aerodynamic characteristics of lifting symmetric supercritical airfoils. Technical Report. National Aeronautical Laboratory, Bangalore, India.

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    Abstract

    All the supercritical airfoils that have been designed13; to date, to the best knowledge of the authors, have reflex camber. An airfoil with camber is not beneficial if it needs to operate at supersonic speeds as may be the case for combat aircraft. Also, an airfoil with camber produces excessive pitching moment, an undesirable feature for helicopter rotors. In view of the above factors, symmetric13; supercritical airfoils which are shock-free at a design free stream Mach number and lift coefficient would be beneficial for application in combat aircraft and helicopter rotors. This paper describes the design and detailed off-design characteristics of two symmetric supercritical airfoils. The off design performance of these airfoils, one derived13; from a NACA 0012 baseline and operating at free stream13; Mach number M=0.752 and incidence a= 1.1 xB0;, and the13; other from NACA 0007 and operating at M=0.78 and13; a=l.50, have been compared with baseline airfoils.13; The comparisons which are in terms of drag rise and buffet onset boundaries 'indicate that the lifting symmetric supercritical airfoils thus obtained are superior to the baseline airfoils.

    Item Type: Proj.Doc/Technical Report (Technical Report)
    Uncontrolled Keywords: Airfoils;Symmetric supercritical airfoils;Camber;Baseline airfoils
    Subjects: AERONAUTICS > Aerodynamics
    Division/Department: Aerodynamics, Aerodynamics
    Depositing User: M/S ICAST NAL
    Date Deposited: 22 Nov 2006
    Last Modified: 24 May 2010 09:53
    URI: http://nal-ir.nal.res.in/id/eprint/3501

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