RAM- and SCRAM-Jet engines can not generate static thrust and only work at high speeds. This starting velocity of the motor v₀ is usually generated by carrier rockets or boosters, which mostly use solid propellants based on ammonium perchlorate (AP) and hydroxyl-terminated polybutadiene (HTPB). Modern solid propellants based on ammonium dinitramide (ADN) and Glycidyl Azide Polymer (GAP) have significant advantages in terms of environmental compatibility and thermodynamic performance. In the present work, it is shown that the already high burning rate of ADN solid propellants can be more than doubled by means of metallic fibers, which significantly increases the thrust of such engines. In order to achieve such results, 3 wt% of Al−Mg alloy fibers are added to the propellant. A formulation with 3 mm long fibres shows the highest burning rate with 84.0 mm/s at 26.5 MPa. Small scale motor tests confirm these investigations. The burning mechanism is studied by SEM/EDX investigations and by measuring the thermal conductivity. These show that the fibres remain on the burning surface and thus transfer the heat from the flame to the depth of the propellant. The thermal conductivity of samples with AlMg5 fibers is about 22 % higher than the reference.

中文翻译：

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具有高燃烧率的 ADN 固体推进剂作为高超声速应用的助推材料

RAM- 和 SCRAM-Jet 发动机不能产生静态推力，只能在高速下工作。发动机的这个启动速度 v ₀通常由运载火箭或助推器产生，它们大多使用基于高氯酸铵 (AP) 和端羟基聚丁二烯 (HTPB) 的固体推进剂。基于二硝胺铵（ADN）和缩水甘油基叠氮化物聚合物（GAP）的现代固体推进剂在环境相容性和热力学性能方面具有显着优势。在目前的工作中，表明已经很高的 ADN 固体推进剂燃烧率可以通过金属纤维提高一倍以上，这显着增加了此类发动机的推力。为了达到这样的结果，3  wt%推进剂中添加了 100 万铝镁合金纤维。具有 3 毫米长纤维的配方在 26.5 兆帕时显示出最高的燃烧速率，为 84.0 毫米/秒。小规模电机测试证实了这些调查。通过 SEM/EDX 研究和测量热导率来研究燃烧机制。这些表明纤维留在燃烧表面上，从而将热量从火焰传递到推进剂的深处。具有 AlMg5 纤维的样品的热导率比参考值高约 22%。