有机氟化物对铝 / 镁-HTPB 富燃料推进剂燃烧性能和凝聚相燃烧产物的影响

To study the effect of organic fluoride (OF) on the combustion performance and condensed phase combustion products of Al / Mg HTPB fuel-rich propellants, three kinds of Al / Mg-HTPB fuel-rich propellants containing OF were prepared. The combustion heat of the propellants in nitrogen and oxygen atmosphere were measured by oxygen bomb calorimeter. The burning rate of the propellant in the pressure range of 3 ~ 9 MPa was measured by means of CCD linear scanning photography, moreover the burning rate pressure exponent was fitted. The condensed phase combustion products of the propellant at 3 MPa were collected, and their morphology, particle size distribution, activated aluminum content and composition were analyzed. The combustion test results show that the addition of OF decreases the combustion heat of HTPB fuel-rich propellant in nitrogen atmosphere and increases that in oxygen atmosphere; the addition of OF increases the burning rate of propellant and reduces the particle size of condensed phase combustion products. However, due to the increase of negative oxygen and the formation of residual carbon, the burning rate and particle size of condensed phase combustion products can't change monotonically with the increase of OF content. The analysis results of condensed phase combustion products show that the addition of OF decreases the residual aluminum content and the agglomeration extent of condensed phase combustion products with particle size less than D₉₀ ; the metal combustion oxides mainly exist in the form of MgAl₂O₄. The addition of OF promotes formation of residual carbon and AlF₃. These results are of great significance for the application of OF in fuel-rich solid propellant.