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Status
Electronic Resource
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Publication
BRL TR 3215; Report; March 1991.
Language
Library's review
ABSTRACT:
The U.S. Army Ballistic Research Laboratory (BRL), in cooperation with the Ernst-Mach lnstitut (EMI), Freiburg im Breisgau, Germany, therefore, initiated an optical study of the flow start-up process in four convergent-divergent nozzles which had the diaphragm separating the high-pressure
The objectives of this investigation were to (a) obtain optical records of the shock formation in the convergent-divergent nozzle immediately after rupturing the diaphragm, (b) study the shock formation and flow start-up processes in the divergent nozzles, (c) determine the influence of the cone angle and length of a divergent nozzle on the pressure signature in the expansion region behind the nozzle and (d) facilitate comparisons with one- and two-dimensional hydrocode computations. The test setup and the results of this experimental study are presented in this report and the significant findings are discussed.
The U.S. Army Ballistic Research Laboratory (BRL), in cooperation with the Ernst-Mach lnstitut (EMI), Freiburg im Breisgau, Germany, therefore, initiated an optical study of the flow start-up process in four convergent-divergent nozzles which had the diaphragm separating the high-pressure
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and low-pressure sections of the shock tube mounted in the throat of the nozzles. Under the auspices of a bilateral data exchange agreement between the governments of the U.S. A. and the Federal Republic of Germany (FRO), the experiments were performed in the 200mm shock tube at EMI. The diaphragm was located at the upstream edge of the viewing window of high-quality optical glass through which shadow and schlieren photographs could be taken. The optical measurements were supplemented by measurements of the static pressure at three locations downstream from the nozzles.The objectives of this investigation were to (a) obtain optical records of the shock formation in the convergent-divergent nozzle immediately after rupturing the diaphragm, (b) study the shock formation and flow start-up processes in the divergent nozzles, (c) determine the influence of the cone angle and length of a divergent nozzle on the pressure signature in the expansion region behind the nozzle and (d) facilitate comparisons with one- and two-dimensional hydrocode computations. The test setup and the results of this experimental study are presented in this report and the significant findings are discussed.
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