Author(s)

R. Monti, G. Zuppardi & A. Esposito

Abstract

Measuring the skin friction coefficient by a computer assisted thermographic technique R. Monti, G. Zuppardi, A. Esposito Institute of Aerodynamics 'Umberto Nobile', Naples, Italy ABSTRACT An integration of computation and experimental thermographic technique is proposed as a method for the measurement of the skin friction coefficient in 2-D, incompressible, turbulent flows. The method consists in measuring, by an unsteady Computerized Thermographic Technique (CTT), the Stanton number distribution on the model surface and scaling down the local Stanton number to the skin friction coefficient by a Reynolds analogy factor (St/cf). The not-intrusive feature and the high space resolution of CTT allows this method to overcome the shortcomings of conventional techniques. The method has been validated on a flat plate at Reynolds numbers per meter (Re/L) of about 7x10$ [m'l] and 2x1 0^ [nT*], and tested on a NACA 0012 airfoil at Reynolds number, based on the model chord (R

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