Accession Number : ADA538513


Title :   Shock Wave Dynamics of Novel Aluminized Detonations and Empirical Model for Temperature Evolution from Post-Detonation Combustion Fireballs


Descriptive Note : Doctoral thesis


Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT


Personal Author(s) : Gordon, J M


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a538513.pdf


Report Date : Mar 2011


Pagination or Media Count : 157


Abstract : This research characterizes the blast wave and temperature evolution of an explosion fireball in order to improve the classification of aluminized conventional munitions based on a single explosive type such as RDX. A drag model fit to data shows initial shock velocities of 1.6-2.8 km/s and maximum fireball radii ranging from 4.3-5.8 m with most of the radii reached by 50 ms upon detonation. The Sedov-Taylor point blast model is fitted to data where a constant release (s=1) of energy upon detonation suggests shock energies of 0.5-8.9 MJ with blast dimensionalities indicative of the spherical geometry (n3) observed in visible imagery. An inverse correlation exists between blast wave energy and overall aluminum content in the test articles. Using a radiative cooling term and a secondary combustion term, a physics-based empirical model is able to reduce 82 data points to five fit parameters to describe post-detonation combustion fireballs. The fit-derived heat of combustion has a 96% correlation with the calculated heat of combustion but has a slope of 0.49 suggesting that only half of the theoretical heat of combustion is realized. Initial temperature is not a good discriminator of detonation events but heat of combustion holds promise as a potential variable for event classification.


Descriptors :   *BLAST WAVES , *COMBUSTION , *DETONATIONS , *SHOCK WAVES , EXPLOSIVES , CORRELATION , ALUMINUM , AMMUNITION , CLASSIFICATION , RDX , DISCRIMINATORS , RADIANT COOLING , THESES , EXPLOSIONS , HEAT OF COMBUSTION , VELOCITY , TEMPERATURE


Subject Categories : Ammunition and Explosives
      Explosions


Distribution Statement : APPROVED FOR PUBLIC RELEASE