Audible and Ultrasonic Acoustic Emissions from Composite Solid Propellants.
Interim rept. Feb-Jun 75,
GEORGIA INST OF TECH ATLANTA SCHOOL OF AEROSPACE ENGINEERING
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An apparatus to test the audible and ultrasonic emissions from composite solid propellants was designed, constructed and checked out. Tests were conducted at 300 psia for eight aluminized HTPB-AP propellants. The tests were conducted under both nitrogen and air pressurization. For the audible emissions in the range 100 - 2500 Hz there is a marked effect of the pressurization fluid. In air the noise output is 10,000 higher than in nitrogen. There is a definite possibility that the noise output is responsible for observed chamber pressure roughness level. For the ultrasonic signal in the range 50 to 300 kHz there are strong spectral peaks observed but their origin is not clear and they do not correlate with observed deflagration behavior. For audible signals a striking effect of AFCAM aluminum coating is the reduction of signal strength.
- Test Facilities, Equipment and Methods
- Combustion and Ignition
- Solid Rocket Propellants