HYPERVELOCITY CAPABILITY AND IMPACT EFFECT PROGRAM.
Memo rept. (final),
NAVAL RESEARCH LAB WASHINGTON D C
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Two approaches to the development of high performance accelerators were investigated. The first approach utilized pulses of electrical energy to heat small chambers of low molecular weight gas to high pressures. The maximum projectile velocities attained from the expansion of this gas did not exceed the velocities which were concurrently being achieved with compression type light-gas guns. The second approach was a continuance of the development of the conventional light-gas gun utilizing gas heating techniques and optimization of gun parameters. Comparisons are made between real gas and ideal gas on the effects of gas temperature and pressure on sound speed, efflux velocity, and maximum flow velocity for steady and nonsteady conditions. At peak gas pressures above 6.8 kilobars the performance of a light-gas gun could be increased by decreasing the temperature profile of the driver gas. All attempts to increase maximum projectile velocities in optimized NRL light-gas guns by pre-heating the driver gas were unsuccessful. Author
- Test Facilities, Equipment and Methods