Method of measuring cross-flow vortices by use of an array of ho

Details Method of measuring cross-flow vortices by use of an array of ho Method of measuring cross-flow vortices by use of an array of ho

1992-01-07

1993-05-11

Woodiel, Donald O.

Measuring and testing

Wind tunnel: aerodynamic wing and propeller study

73178R, 7320411, G01M 900

Patent

active

052091112

ABSTRACT:
The invention is a method for measuring the wavelength of cross-flow vortices of air flow having streamlines of flow traveling across a swept airfoil. The method comprises providing a plurality of hot-film sensors. Each hot-film sensor provides a signal which can be processed, and each hot-film sensor is spaced in a straight-line array such that the distance between successive hot-film sensors is less than the wavelength of the cross-flow vortices being measured. The method further comprises determining the direction of travel of the streamlines across the airfoil and positioning the straight-line array of hot film sensors perpendicular to the direction of travel of the streamlines, such that each sensor has a spanwise location. The method further comprises processing the signals provided by the sensors to provide root-mean-square values for each signal, plotting each root-mean-square value as a function of its spanwise location, and determining the wavelength of the cross-flow vortices by noting the distance between two maxima or two minima of root-mean-square values.

REFERENCES:
patent: 4727751 (1988-03-01), Holmes et al.

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