Combustion simulations of AlH3 and ethanol nanofluid by ReaxFF

Cheng, Yu-Xiao; Zhao, Fengqi; Xu, Shidang; Ju, Xue‐Hai; Zhao, Ying

doi:10.1016/j.fuel.2023.127438

Cited by 4 publications

(1 citation statement)

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“…Current research on AlH 3 has primarily focused on dehydrogenation control [10,11], ignition/combustion characteristics [9,[12][13][14], oxidation mechanism [15][16][17], and synthesis and stabilization [18,19]. DeLuca et al [7,20] highlighted that propellants containing AlH 3 exhibit lower flame intensity and smaller particle size of agglomerates compared to those containing aluminum, and increasing the AlH 3 content in the HTPB-based propellant formulations can achieve better flame phenomenon, interior ballistic characteristics, and ageing features.…”

Section: Introductionmentioning

confidence: 99%

Reduction of agglomeration effect by aluminum trihydride in solid propellant combustion

Gou,

Hu,

et al. 2023

Propellants Explo Pyrotec

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Aluminum trihydride (AlH3) has gained considerable attention as a substitute fuel for aluminum in solid propellants. In this study, we conducted a systematic investigation to evaluate the effects of AlH3 content, ranging from 0 % to 18 %, on propellant ignition, combustion, and agglomeration. Experimental methods such as thermogravimetry−differential scanning calorimetry (TG‐DSC), laser ignition, high‐speed photography, and collecting condensed combustion products (CCPs) were employed. The results indicate that AlH3 significantly promotes the high‐temperature decomposition of ammonium perchlorate (AP). Meanwhile, the addition of cyclotetramethylene tetranitramine (HMX) in propellant does not affect the hydrogen release reaction of AlH3. As the AlH3 content increases from 0 % to 18 %, the spectral emission intensity of the propellants decreases, and the ignition delay time initially increases from 253 ms to 321 ms, and then decreases to 258 ms. Furthermore, the burning rate increases with increasing the AlH3 content, while the pressure exponent is reduced from 0.551 to 0.460. The inclusion of AlH3 in propellants significantly inhibits aluminum agglomeration near the burning surface. Additionally, as the AlH3 content increases, the mean particle size D43 of the CCPs decreases from 50.95 μm to 8.28 μm at 1 MPa. The agglomeration degree of aluminum is very weak at 7 MPa, especially when the AlH3 content exceeds 9 %. The conclusions drawn from this study can serve as valuable guidance for optimizing propellant formulations.

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