Accession Number : AD0908661

Title :   Parametric Study of the Conical Shock Tube,

Corporate Author : NAVAL ORDNANCE LAB WHITE OAK MD

Personal Author(s) : Connor, Joseph G., Jr

Report Date : 18 JAN 1973

Pagination or Media Count : 61

Abstract : Two series of shots were fired, one before, and one after cleaning the walls of the NOL Conical Shock Tube with a heated caustic spray. All driver charges weighed less than one pound. The cleaning caused little change in side-on pressure values, and its effect on opacity and drag measurements was lost after two or three shots. Photographs of explosion luminosity in the gun barrel indicated a small accumulation of wall deposits, even after many shots. Three driver explosives were used: cast 50/50 pentolite, which has been the standard, but is costly to prepare and has been the major source of wall residue deposits; primacord, whose preparation is considerably less costly but which leaves an inordinate amount of wall residue; and Composition C-4, plastic explosive which combines the advantages of both pentolite and primacord. A stagnation pressure gage was used for the first time in the Conical Shock Tube; dynamic pressures deduced from its output agree well both with earlier measurements and with theory. Plots of typical scaled values of various tube parameters versus scaled distance from the theoretical apex have been included. (Author)

Descriptors :   (*SHOCK TUBES, CLEANING), CONICAL BODIES, EXPLOSIVES, PENTOLITE, PETN, PLASTIC EXPLOSIVES, RDX, WALLS, DEPOSITS, PRESSURE GAGES, STAGNATION POINT, EXPLOSIVE CHARGES, PRESSURE, DRAG, INTERIOR BALLISTICS.

Subject Categories : Test Facilities, Equipment and Methods
      Ballistics

Distribution Statement : APPROVED FOR PUBLIC RELEASE