The Visible Radiation from Helium in a Strong Shock Wave Page: 43
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43
basis the estimated maximum error In measurement of the shock velocity
for any individual shot might be expected to be
and for the worst set of length and transit time measurements, this
amounted to 0.12 ram/psec for a tube 10" long and 0.04 inm/psec for a tube
30" long, where V ■ 12.47 mm/psec, or l£ for a 10” tube and 0.3^ for a
30” tube.
Data from transit time measurements ore plotted on Fig. 12 to show
reproducibility from shot to shot. Two tube lengths, 10” and 30", were
used to detect ejy measurable attenuation of the shock wave within a 30”
run. Figure 12 suggests that the average velocity over the first 10" of
tube length may be less than that for the full run of 30"* This may
indeed be the case because of the time required to accelerate the Furane
surface by explosive gases, but the difference is so slight as not to be
definitely established with the technique used here. Also there is no
known reason why the velocity for 20 mm Hg initial pressure should be
higher than that for 5 mm Hg initial pressure as is indicated in Fig. 12.
Since these trends were within the experimental reproducibility, they
were attributed to random differences in shock tubes, and the data from
30" tubes were averuged to provide a single velocity for all pressures.
This is reasonable if it is recalled that explosive gases under a pressure
of several hundred thousand utnospheres are expanding into a region with
a pressure of less than 0.1 atm, and thus small changes in initial shock
tube pressure would not be expected to cause a measurable change in shock
velocity.
G33 C50
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Seay, Glenn Emmett. The Visible Radiation from Helium in a Strong Shock Wave, report, January 1957; Los Alamos, New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc502356/m1/50/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.