Performance Predictions for the Large Blast/Thermal Simulator Based on Experimental and Computational Results PDF Download
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Languages : en
Pages : 48
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Book Description
A computational study was performed with the BRL-Q1D code to determine the expected performance characteristics fo the proposed U.S. Large Blast/Thermal Simulator (LB/TS). This computational study complements an earlier experimental parametric study which was performed in the 25.4-cm shock tube located at the BRL. For the experiments, the BRL 25.4-cm shock tube was configured as a 1:57 scale, axisymmetric, single-driver model of the LB/TS. This report documents two computational parametric studies which were performed to determine the range of nuclear blast simulations available with the current LB/ TS design. The first parametric study s a comparison with existing experimental data to validate the computational model and to determine the limits of its accuracy. The second parametric study used the validated computational model to predict the operating range of the LB/TS design.
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Category :
Languages : en
Pages : 48
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Book Description
A computational study was performed with the BRL-Q1D code to determine the expected performance characteristics fo the proposed U.S. Large Blast/Thermal Simulator (LB/TS). This computational study complements an earlier experimental parametric study which was performed in the 25.4-cm shock tube located at the BRL. For the experiments, the BRL 25.4-cm shock tube was configured as a 1:57 scale, axisymmetric, single-driver model of the LB/TS. This report documents two computational parametric studies which were performed to determine the range of nuclear blast simulations available with the current LB/ TS design. The first parametric study s a comparison with existing experimental data to validate the computational model and to determine the limits of its accuracy. The second parametric study used the validated computational model to predict the operating range of the LB/TS design.
Author: D. M. Hisley
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Category :
Languages : en
Pages : 65
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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.
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Category :
Languages : en
Pages : 42
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One of the continuing research efforts of the Blast Dynamics Branch at the U.S. Army Ballistic Research Laboratory (BRL) is to simulate the flow that results from nuclear explosions and to test the nuclear survivability of military equipment. When atmospheric nuclear blast tests were banned, chemical explosive tests were designed and conducted to simulate the blast and thermal pulses produced by real nuclear explosions. These full-scale tests provided data for analysis of nuclear survivability to tactical Army equipment. However, the logistics and expense of full-scale chemical explosive tests meant that an average of only one test could be conducted every two years. A series of computational simulations are performed for comparison to experimental data from a 1/57 -scale Large Blast Simulator (LBS) experimental shock tube. The computations simulate experiments with various high pressure and temperature initial driver gas conditions. In addition to temperature and pressure variations, geometry and numerical accuracy variation are performed and studied. The computations were performed using an axisymmetric, inviscid, time-accurate, finite-volume numerical technique which employs upwind flux differencing with total variation diminishing techniques. Computational results are presented in the form of static and stagnation pressure versus time histories and contour plots. Keywords: Supercomputer simulations, Euler equations, Upwind.
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Category : Government reports announcements & index
Languages : en
Pages : 1334
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Author: Dixie M. Hisley
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Category : Blast effect
Languages : en
Pages : 48
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Computational fluid dynamics is a tool which predicts the gas dynamics of blast problems of interest to the Army by solving a set of mathematical equations with a high-speed digital computer. The governing equations for the blast problems presented here are the two-dimensional unsteady Euler equations. The computations were performed on a Cray XMP/48 supercomputer by discretizing the Euler equations with an upwind, Total Variation Diminishing, finite volume, implicit scheme. Details of the scheme are presented in the paper. The algorithm is used here to provide gas dynamic information for a candidate large-scale blast simulator (LBS) concept. A growing need exists for nuclear blast survivability testing of tactical equipment. In order to meet this need, research is conducting into the design and operation of a Large-scale Blast Thermal Simulator, essentially a large multi-driver shock tube. Experiments with heated and unheated driver gas have been performed in a single driver, 1/67 scale model of the LB/TS design concept but without the thermal simulation (LBS). One dimensional calculations have been performed for the 1/67 scale LBS with useful results. However, the one-dimensional calculations have had limited success for accurately predicting the flow through the diverging portion of the LBS design because the flow in this region is multi-dimensional. The flow is multi-dimensional due to the rapid and large area change that exists in the diverging nozzle. The paper presents results which demonstrate the nature of fluid physics in the 1/57 scale LBS. (jhd).
Author: Bernard J. Guidos
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ISBN:
Category : Blast effect
Languages : en
Pages : 50
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ISBN:
Category : Computers
Languages : en
Pages : 808
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Author: Fatih Kinoglu
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ISBN:
Category : Computer-aided engineering
Languages : en
Pages : 798
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Author: Stephen J. Schraml
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Category : Nuclear explosions
Languages : en
Pages : 106
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 1102
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