Pressure Oscillations during the Interior Ballistic Firing of Regenerative Liquid Propellant Guns
Final rept. Jan 1985-May 1986,
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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Pressure oscillation data from 25-mm and 30-mm regenerative Injection liquid propellant gun tests are examined and interpreted in terms of acoustical instabilities. Data from one test with the 30-mm suggest that the observed frequencies are consistent with sound speeds between 976 ms and 1,009 ms. For comparison, the thermodynamic computed sound speed, based on a BLAKE calculation and assuming a 10 heat loss, Is 1,134 ms. Also, a mean sound speed computed from the RLPG model by Terence Coffee of the Ballistic Research Laboratory and assuming delayed burning is 967 ms.