To reduce slag formation and burning rate increases, the effects of radial acceleration (up to 20 g) and low pressure (2-7 MPa) on the combustion of low-burning rate aluminized propellants (87 formulations) were investigated. Experiments were performed to obtain agglomerate size distribution, slag formation, and burning rate data. Data sources included photographs under cross flow and acceleration conditions, scanning electron probe (Cl and Al) images, particle collection combustors, and rocket motors. The tendency to form slag increases as the agglomeration size at the burning surface increases. A lower burning rate increases acceleration effects. However, residue formation is more sensitive to formulation than is burning rate; for example, bimodal vs trimodal AP can cause significant changes in residue in the absence of burn rate changes; RDX produces larger agglomerates than HMX. Through understanding obtained from this research, reduction in agglomeration, slag formation, and burning rate augmentation are directly attributable to systematic changes in formulation ingredient levels and sizes.

No abstract

No abstract

Colorado Springs, Colorado FOI pirmission lo copy w fapublish, contact Iho llnsrlcan Intll(uIa of IlsranauIIcs and Ilslfonaullcs 8 I290 lwnus ai Ihe lmericrs. Now York. Nr 10104 .y/ Downloaded by Technische Universitaet Muenchen Universitaetsbibliothek on July 31, 2015 | http://arc.aiaa.org | AbstractTo reduce slag formation and burning rate increases, the effects of radial acceleration (up t o 20 g's) and low pressure (2 t o 7 MPa) on the combustion of iowburning-rate aluminized propellants (87 formulations) were investigated. Experiments were performed t o obtain agglomerate size distribution, slag formation, and burning rate data. Data sources include photographs under crossflow and acceleration conditions, scanning electron probe (CI and AI) images, particle collection combustors, and rocket motors. ihe tendency t o form slag increases as the agglomeration size at the burning surface increases. Lower burning rate increases acceleration effects. However, residue formation is more sensitive t o formulation than is burning rate, e.&, bimodal vs trimodal AP can cause significant changes in residue in the absence of burn rate changes; RDX produces larger agglomerates than HMX. Through understanding obtained from this research, reduction in agglomeration, slag formation, and burning rate augmentation are attributable directly t o systematic changes in formulation ingredient levels and sizes.