Accession Number : ADA296046

Title :   Solid Rocket Motor Plume Particle Size Measurements using Multiple Optical Techniques in a Probe.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Manser, John R.

PDF Url : ADA296046

Report Date : MAR 1995

Pagination or Media Count : 109

Abstract : An experimental investigation to measure particle size distributions in the plume of sub-scale solid rocket motors was conducted. A phase-Doppler particle analyzer (pDPA) in conjunction with three-wavelength extinction measurements were used in a specially designed particle collection probe in an attempt to determine the entire plume particle size distribution. In addition, a laser ensemble particle sizer was used for comparative data. The PDPA and Malvem distributions agreed in the observed modes near 1 and 4.5 mm diameter (d). Scanning Electron Microscope (SEM) pictures of collected particles were in good agreement with the measured Malvem Sauter Mean diameter (d,%) of 2.59 mm. Data analysis indicate that less than 3% of the total mass of the particles was contained in particles with diameter d <0.5 mm. Therefore, the PDPA, which can typically measure particles down to a minimum diameter of 0.5 mm with a dynamic range (d max:d min) of 50:1, can be used by itself to determine the particle size distribution. Multiple wavelength measurements were found to be very sensitive to inaccuracies in the measured transmittances.

Descriptors :   *PLUMES, *SOLID PROPELLANT ROCKET ENGINES, FREQUENCY, DATA PROCESSING, DIAMETERS, MEASUREMENT, METHODOLOGY, OPTICAL PROPERTIES, OPTICS, PARTICLE SIZE, PROBES, SCALE MODELS, DISTRIBUTION, MASS, ELECTRON MICROSCOPES, ELECTRONIC SCANNERS, LASERS, TRANSMITTANCE, PARTICLES, ALUMINUM OXIDES, MEAN, DOPPLER SYSTEMS, COLLECTION, DYNAMIC RANGE.

Subject Categories : Combustion and Ignition
      Solid Propellant Rocket Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE