Accession Number:

ADA123274

Title:

Comparison of Hull Hydrocode Computations of Shock Tube Blockage Effects on Target Loading for Step Shocks and Rapidly-Decaying Shocks

Descriptive Note:

Final rept. Aug 1981-Aug 1982

Corporate Author:

ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD

Report Date:

1982-12-01

Pagination or Media Count:

54.0

Abstract:

The HULL hydrocode was used to make two-dimensional calculations for the three-dimensional axisymmetric problem of a rapidly-decaying shock wave striking a finite right-circular cylinder whose axis was coincident with that of a cylindrical shock tube. Calculations were made for three peak shock over- pressures for 20 percent blockage and for a free-field encounter. These results were then compared with previously reported HULL computations for comparable overpressure step shocks for the same configuration. The net axial loading for these rapidly-decaying shocks behaved quite differently from that for the step shocks. It became negative early in the drag phase for the shocktarget encounter in the free field, and oscillated about a net negative value in the drag phase. Net impulse showed a corresponding decrease from a peak after the end of the diffraction phase for the decaying shocks. Net impulse increased monotonically for the step shocks.

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE