Accession Number : ADA257623


Title :   Emissivity of Rocket Plume Particulates


Descriptive Note : Master's thesis


Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA


Personal Author(s) : Whisman, Curtis D


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a257623.pdf


Report Date : Sep 1992


Pagination or Media Count : 43


Abstract : The optical properties of motor aluminum oxide are required inputs to current plume signature prediction codes, such as SIRRM. Accurate predictions are possible only if variations in the particle emissivity due to changes in particle size, contamination, and changing temperature, etc. are known. This investigation demonstrated a simplified method for determination of the emissivity of Rocket motor generated alumina. Plume particulate material was collected on tungsten alloy wire during motor firings. A DC circuit was used to resistively heat the material, and the temperature was determined at various points by relating the wire resistivity to circuit current and voltage. An Agema Thermovision infrared (3.5-5 micron) camera and microscope were used to observe the material during heating, and Broadband emissivity was computed using system software. It was estimated that the emissivity could be measured with an accuracy of plus or minus 3%. Motor alumina was found to have significantly greater emissivity than pure alumina in the temperature range of 500-1200 K. Solid-Propellant, Rocket Motor, Alumina, Emissivity.


Descriptors :   *PARTICULATES , *PLUMES , *ROCKETS , *EMISSIVITY , INPUT , MEASUREMENT , OPTICAL PROPERTIES , PARTICLE SIZE , TEMPERATURE , PREDICTIONS , MATERIALS , COMPOSITE MATERIALS , RESISTANCE , WIRE , ACCURACY , THESES , VOLTAGE , SOLIDS , ALLOYS , VARIATIONS , PROPELLANTS , THERMOVISION , SOLID PROPELLANTS , TUNGSTEN ALLOYS , TUNGSTEN , ROCKET ENGINES , DETERMINATION , MOTORS , DIRECT CURRENT , MICROSCOPES , HEAT , CONTAMINATION , CIRCUITS , PARTICLES , OXIDES , ALUMINUM OXIDES , ALUMINUM , HEATING , BROADBAND , CAMERAS , SIGNATURES


Subject Categories : Inorganic Chemistry
      Thermodynamics
      Combustion and Ignition
      Rocket Engines


Distribution Statement : APPROVED FOR PUBLIC RELEASE