Accession Number : AD0478684


Title :   EFFECTIVE POROSITY OF RIBBON GRIDS.


Descriptive Note : Final rept. 15 Apr 63-15 Apr 65,


Corporate Author : MINNESOTA UNIV MINNEAPOLIS DEPT OF AERONAUTICS AND ENGINEERING MECHANICS


Personal Author(s) : Heinrich, H G ; Greig, R C


Report Date : Dec 1965


Pagination or Media Count : 37


Abstract : The effective porosity of practically rigid steel ribbon and more elastic nylon ribbon grids of various geometric construction and geometric porosities was measured. In all cases the effective porosity of nylon ribbon grids was higher than the one of a comparable rigid grid. It was shown that the variation of nylon grids was caused through elastic deformation. For a few steel ribbon grids, a discharge coefficient was calculated which varied between 0.6 and 0.7 in the incompressible region and approached a limiting value of 0.8 in the compressible range. (Author)


Descriptors :   *AIRCRAFT CANOPIES , MATERIALS , POROSITY , GEOMETRIC FORMS , NYLON , STEEL , ORIFICES , MATHEMATICAL MODELS , GAS FLOW , CONFIGURATIONS , ELASTIC PROPERTIES , DEFORMATION , FORCE(MECHANICS) , FUNCTIONS(MATHEMATICS) , RIBBON PARACHUTES , POROUS MATERIALS , DENSITY , BAROMETRIC PRESSURE , VELOCITY , GRAPHICS , MODEL TESTS , TABLES(DATA)


Subject Categories : Gliders and Parachutes


Distribution Statement : APPROVED FOR PUBLIC RELEASE