Dal Maddalon Phones & Addresses
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110 Old Dominion Rd, Yorktown, VA 23692 (757) 898-6519
Work
Position:
Retired
Education
Degree:
Associate degree or higher
Publications
Us Patents
Method Of Measuring Cross-Flow Vortices By Use Of An Array Of Hot-Film Sensors
View pageUS Patent:
52091112, May 11, 1993
Filed:
Jan 7, 1992
Appl. No.:
7/823805
Inventors:
Naval K. Agarwal - Yorktown VA
Dal V. Maddalon - Yorktown VA
Siva M. Mangalam - Kingsmill on the James VA
Dal V. Maddalon - Yorktown VA
Siva M. Mangalam - Kingsmill on the James VA
Assignee:
The United States as represented by the United States National
Aeronautics and Space Administration - Washington DC
Aeronautics and Space Administration - Washington DC
International Classification:
G01M 900
US Classification:
73147
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.