Accession Number : ADA320936

Title :   Characterization of Jet Flow From a Decaying Wave Blast Simulator.

Descriptive Note : Final rept.,

Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Schraml, Stephen J.

PDF Url : ADA320936

Report Date : JAN 1997

Pagination or Media Count : 43

Abstract : A computational study was performed to characterize the time-dependent jet flow exiting the expansion tunnel of the large blast/thermal simulator (LB/TS). The aerodynamic environment produced by the jet flow has been identified as a possible means of testing full scale military equipment in high drag blast events. Two-dimensional (2-D) axisymmetric calculations were used to estimate the peak pressure, velocity, and impulse levels in the jet flow as a function of the initial conditions. Next, a set of 2-D planar symmetry calculations was performed to assess the effect of the ground plane on the flow field and determine the changes in flow parameters as a function of distance from the exit plane. Finally, a set of three-dimensional (3-D) calculations was used to generate a detailed description of the time-dependent flow and to determine its spatial uniformity for vehicle testing. The 3-D calculation simulating the maximum operational limit of the facility resulted in a peak flow velocity of approximately 420 m/s in an event with a duration of approximately 1.2 s.

Descriptors :   *SIMULATORS, *BLAST WAVES, *SHOCK TUBES, PEAK VALUES, COMPUTATIONS, TIME DEPENDENCE, OVERPRESSURE, THREE DIMENSIONAL, FLOW FIELDS, FLOW RATE, AXISYMMETRIC, EXPANSION, BLAST, JET FLOW, DYNAMIC PRESSURE.

Subject Categories : Explosions

Distribution Statement : APPROVED FOR PUBLIC RELEASE