Particle size measurements were obtained at the grain exit and nozzle entrance in a solid fuel ramjet combustor using a boron based fuel. The particle size distributions at the aft end of the fuel grain were generally quadra-modal, with mode peaks at 2, 4,15, and 25 - 45 microns. At the nozzle entrance the distributions were tri-modal, due to the complete oxidation of the 2 micron particles. Sauter mean diameter and the size of the largest agglomerates increased with increasing equivalence ratio (or grain length), indicating that the longer grains result in more surface agglomeration. Combustion efficiency increased with equivalence ratio. A direct correlation of particle size alone with combustion efficiency was not obvious and may require an accurate measurement of particle concentration. Keywords: Integral rocket ramjet engines; Rocket propellant grains; Solid fuel ramjet engines; Combustion; Laser particle measurement; Metallized rocket fuels. Theses. (edc)
Metallized Fuel Particle Size Study in a Solid Fuel Ramjet
1989
62 pages
Report
No indication
English
Fuels , Rocket Propellants , Jet & Gas Turbine Engines , Ramjet engines , Rocket propellant grains , Solid jet engine fuels , Accuracy , Agglomerates , Boron , Combustion , Combustors , Correlation , Diameters , Distribution , Efficiency , Integral rocket ramjets , Laser applications , Mean , Measurement , Metallizing , Oxidation , Particle size , Particles , Ratios , Rocket engines , Rocket fuels , Rocket nozzles , Surfaces , Theses , Metallized fuels , Size distribution
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