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The Effect of Solid Constituent Particle Size Distributions on TP-H1148 Propellant SlagSpecial aluminum and ammonium perchlorate (AP) particle size distributions were prepared for a matrix of five-inch diameter, center-perforated (CP) motor tests to measure the aluminum oxide slag response in Space Shuttle Reusable Solid Rocket Motor (RSRM) propellant. Previous tests of TP-H1148 propellant in five-inch CP spin motors have shown a correlation between aluminum particle size and generated slag. The motors for this study were cast from thirteen five-gallon propellant mixes which used five particle size levels of aluminum powder, five of unground AP and three of ground AP. Aluminum had the greatest effect on slag formation, the more coarse fractions causing greater slag quantities and larger slag particles. Unground AP had about half the effect of aluminum with the coarser fractions again producing more and larger sized slag particles. The variation in ground AP did not have a significant effect on slag formation. Quench bomb tests showed the same trends as the spin motors, that is, larger aluminum and AP particle size distributions generated larger slag particles leaving the propellant surface. Cured propellant mechanical properties were also impacted by particle size variation.
Document ID
19980217990
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
May, Douglas H.
(Thiokol Corp. Brigham City, UT United States)
Miles, William L.
(Thiokol Corp. Brigham City, UT United States)
Taylor, David S.
(Thiokol Corp. Brigham City, UT United States)
Rackham, Jon L.
(Thiokol Corp. Brigham City, UT United States)
Date Acquired
August 18, 2013
Publication Date
October 1, 1997
Publication Information
Publication: 34th JANNAF Combustion Subcommittee Meeting
Volume: 2
Subject Category
Propellants And Fuels
Funding Number(s)
CONTRACT_GRANT: NAS8-38100
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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