Accession Number : ADA268454


Title :   Laser Ignition of Solid Propellants: 1. Ignition Delays


Descriptive Note : Final rept. Jan 90-Dec 91,


Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD


Personal Author(s) : Cohen, Arthur ; Beyer, Richard A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a268454.pdf


Report Date : Jul 1993


Pagination or Media Count : 42


Abstract : Ignition experiments on nitrate-ester and nitramine propellants have been conducted in a closed bomb. The ignition source was a variable ( 100 W) cw C02 laser. Ambient conditions were room temperature and atmospheric pressure. Air, argon, and nitrogen gases were used. Times to detect and changes in emission rate which are attributed to onset of flamespreading have been compared with ignition delay calculations using a condensed phase radiant ignition model. Reasonable values for thermochemical properties and experimental determined values for chemical kinetic parameters and optical properties were used for the calculations. The flux dependence of the initial emission delays were in reasonable agreement with model predictions for nitrate-esters but not for nitramines. Gas phase (composition) effects on initial emission were observed with XM39, an RDX nitramine, but not with nitramines. Flamespreading delays showed gas composition effects with all propellants. These results suggest that (for all propellants) the effects of gas phase reactions on flamespreading and (for nitramines) on initiation need to be included (explicity) in radiant ignition models for predicting pressurization in gun chambers.... Lasers, Solid propellants, Laser ignition.


Descriptors :   *LASERS , *DELAY , *IGNITION , *NITRAMINES , *NITRATES , *SOLID PROPELLANTS , *ESTERS , EMISSION , OPTICAL PROPERTIES , TEMPERATURE , DETECTION , PREDICTIONS , MODELS , NITROGEN , ROOM TEMPERATURE , ARGON , BAROMETRIC PRESSURE , FLAMES , PRESSURIZATION , KINETICS , THERMOCHEMISTRY , PROPELLANTS , VARIABLES , GASES , ATMOSPHERICS , GUN CHAMBERS , CLOSED BOMB TESTS , CONDENSATION , CARBON DIOXIDE LASERS , RDX , PHASE , AIR , CHEMICALS , PARAMETERS , FLUX(RATE) , CONTINUOUS WAVES , RATES


Subject Categories : Lasers and Masers
      Guns
      Combustion and Ignition
      Solid Rocket Propellants


Distribution Statement : APPROVED FOR PUBLIC RELEASE