The effects of acoustic dampening devices on the pressure oscillations observed in a 30-mm regenerative liquid propellant gun were analyzed. Acoustic quarter-wave cavities and radial baffles were installed in the forward section of the combustion chamber and attached to the face of the injection piston. The flow exit geometry and the liquid propellant injection sheet thickness were also varied to determine their effect on the pressure oscillations. The use of the forward chamber cavities reduced the average RMS pressure 16 to 39 percent in the plane closest to the cavities. The spectral density in the 23 to 27-kHz frequency range was reduced 42 to 97 percent. The dominant frequency was shifted to the 30 to 40-kHz range when the forward cavities were used. The use of baffles reduced the RMS pressure 37 to 44 percent and the peak-to-peak pressure 31 to 41 percent. No significant effects could be determined from changes in the sheet thickness or the flow exit geometry due to the amount of scatter in the test data. The RMS and peak-to-peak pressure and the spectral density level were generally higher closer to injector orifice.
The effect of acoustic dampening devices in regenerative liquid propellant guns
Einfluß von akustischen Dämpfungsvorrichtungen in regenerativen Flüssigkeitstreibstoffkanonen
Joint Army-Navy-NASA-Air Force (JANNAF) Propulsion Meeting, 1990 ; 1 , Sep ; 389-399
1991
11 Seiten, 8 Bilder, 4 Tabellen, 18 Quellen
Aufsatz (Konferenz)
Englisch
THE EFFECT OF ACOUSTIC DAMPENING DEVICES IN REGENERATIVE LIQUID PROPELLANT GUNS
British Library Conference Proceedings | 1990
|Progress in Modeling Pressure Oscillations in Regenerative Liquid Propellant Guns
British Library Conference Proceedings | 1998
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