Abstract
Incorporating aluminum metal-organic frameworks(Al-MOFs)as energetic additives for solid fuels presents a prom-ising avenue for enhancing combustion performance.This study explores the potential benefits of Al-MOF(MIL-53(Al))ener-getic additive on the combustion performance of hydroxyl-terminated polybutadiene(HTPB)fuel.The HTPB-MOF fuel samples were manufactured using the vacuum-casting technique,followed by a comprehensive evaluation of their ignition and combus-tion properties using an opposed flow burner(OFB)setup utilizing gaseous oxygen as an oxidizer.To gauge the effectiveness of Al-MOFs as fuel additives,their impact is compared with that of nano-aluminum(nAl),another traditional additive in HTPB fu-el.The results indicate that the addition of 15％(mass fraction)nAl into HTPB resulted in the shortest ignition delay time(136 ms),demonstrating improved ignition performance compared to pure HTPB(273 ms).The incorporation of Al-MOF in HTPB also reduced ignition delay times to 227ms and 189ms,respectively.Moreover,under high oxidizer mass flux conditions(79-81kg/(m2s)),HTPB fuel with 15％nAl exhibited a substantial 83.2％increase in regression rate compared to the baseline HTPB fuel,highlighting the positive influence of nAl on combustion behavior.In contrast,HTPB-MOF with a 15％Al-MOF additive showed a 32.7％increase in regression rate compared to pure HTPB.These results suggest that HTPB-nAl out-performs HTPB-MOF in terms of regression rates,indicating a more vigorous and rapid burning behavior.
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