Accession Number:

ADA158080

Title:

Performance and Predictions for a Large Blast Simulator Model.

Descriptive Note:

Final technical rept.,

Corporate Author:

ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s):

Report Date:

1985-04-01

Pagination or Media Count:

65.0

Abstract:

An attempt is made to verify the predictions from a l-D BRL Code against the flow from a complicated, non-straight shock tube configuration the code then could be utilized for future Large BlastThermal Simulator LBTS design and prediction of performance, The shock tube is a 137 scale, axisymmetric model following the design for a multi-driver large blast simulator LBS located at Centre dEtude, Gramat, France. It is used to produce shock pressures from 3.1 to 31 psi 21 to 214 kPa and characteristic decaying wave forms. The BRL code is a quasi-one-dimensional, adiabatic, inviscid, Eulerian computer algorithm. The code is described and some preliminary checks against related configurations are performed. Furthermore, the code uses the experimental tube geometry and run conditions to generate flow data for comparison with the experimental data. Additionally, parameter studies are done-necking down of nozzle throat at the diaphragm station, heating of the driver gas, temperature effect on driver due to pressurizing--to check their influence on the tube behavior. In general, computed blast wave forms as well as levels agree well with experiment except for the highest levels where head losses and real gas effects are more pronounced. With the natural-burst-of-diaphragm operation of tube, diaphragm blockage of the nozzle throat is a problem temperature effects due to pressurizing of driver are not.

Subject Categories:

  • Test Facilities, Equipment and Methods
  • Explosions

Distribution Statement:

APPROVED FOR PUBLIC RELEASE