Performance and Predictions for a Large Blast Simulator Model.
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 Blast/Thermal Simulator (LB/TS) design and prediction of performance, The shock tube is a 1/37 scale, axisymmetric model following the design for a multi-driver large blast simulator (LBS) located at Centre d'Etude, 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1985
- Accession Number
- ADA158080
Entities
People
- B. P. Bertrand
- D. M. Hisley
- E. J. Gion
Organizations
- Ballistic Research Laboratory