Evaluating Ignition and Combustion Prformance with AI-Metal-Oreganic Fameworks and Nano-Aluminum in HrTPBFuel

Incorporating aluminum metal-organic frameworks（Al-MOFs） as energetic additives for solid fuels presents a promising avenue for enhancing combustion performance. This study explores the potential benefits of Al-MOF(MIL-53（Al）) energetic 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 combustion 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 fuel. The results indicate that the addition of 15%（mass fraction） nAl into HTPB resulted in the shortest ignition delay time（136ms）, demonstrating improved ignition performance compared to pure HTPB（273ms）. 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 outperforms HTPB-MOF in terms of regression rates, indicating a more vigorous and rapid burning behavior.