Heats of Explosion at Low Pressures. 2
Final rept. Oct 1989-Jan 1990
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
Pagination or Media Count:
An alternate method for estimating the thermal energy E of propellant combustion products in guns at low pressures has been investigated. The method assumes that for same pressure levels in guns and calorimeter bombs, E is equal to the measured heat of explosion HEX. HEX have been measured in calorimeters for M30 and XM39 at low initial pressures Po 25-1015 psia. Low loading densities LD .0002-012 gcc were used to minimize the uncertainty in the calorimeter pressure level during combustion. The values for HEX, at the higher LD, imply that combustion is complete. As Pa and Ld decrease, a fall off in HEX from the values obtained at the higher LD is observed. This is attributed to a change in the combustion mechanism which leads to incomplete combustion. HEX values in the fall off region are also dependent of the physical environment in the calorimeter. This implies that some knowledge of the physical processes which occur during combustion at low pressures in calorimeter bombs and guns is required to assess the usefulness of estimating values for E from the HEX measurements.
- Ammunition and Explosives
- Combustion and Ignition