Measurement of Sub-micron A1203 particles in rocket plumes.
Vaughn, John K.
Netzer, David Willis
Shreeve, Raymond P.
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Transmission measurements using six wavelengths were made through the edges of plumes for solid propellant rocket motors using various propellants and motor geometries. The average values obtained for the aluminum oxide particles were a Sauter mean diameter of 0.30 + /- .02 microns, an index of refraction of 1.64 + /- .04 and standard deviation of 1.52 + /- .12 for the assumed monomodal, log-normal size distribution. The results indicated that the small aluminum oxide particles in the plume edge were gamma-AL203, independent of propellant composition, motor operating conditions and nozzle geometry. The good correlation of the data indicated that the small particles can be adequately represented by a monomodal, log-normal distribution
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