ACOUSTIC WAVE-BURNING ZONE INTERACTION IN SOLID PROPELLANTS
Special progress rept. for 1 Apr-30 Jul 1962
AEROCHEM RESEARCH LABS INC PRINCETON NJ
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It was determined that the real part of the acoustic admittance of the propellants which were tested must be less in absolute magnitude than the minimum detectable with the present type of experiment -0.0025rayls, in which the sound wave makes only one pass through the combustion zone. Additional work toward detecting luminosity waves in the combustion gases from propellants which were being acoustically driven failed to confirm the presence of these waves. It is postulated that the acoustic amplitude was insufficient to produce luminosity waves of detectable amplitude. Experiments indicated that at 1400 cps the acoustic damping constant of propellant combustion product gases is approximately three-fold greater for an aluminized than for a similar non- aluminized propellant. An experiment which has been used by other investigators to study the acoustic damping constant of gases is discussed relative to its possible use to determine the absolute value of the damping constant for the combustion gases at their combustion temperature.