Plateau Burning Behavior of Ammonium Perchlorate Sandwiches and Propellants at Elevated Pressures
Plateau Burning Behavior of Ammonium Perchlorate Sandwiches and Propellants at Elevated Pressures
复制标题
高氯酸铵三明治和推进剂在高压下的高原燃烧行为
DOI：
10.2514/2.6102
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发表时间：
2003
影响因子：
1.9
通讯作者：
J. Seitzman
中科院分区：
文献类型：
--
作者：
S. Chakravarthy;E. Price;R. Sigman;J. Seitzman
本文报道了由高氯酸铵（AP）和聚合物粘合剂中AP颗粒基质交替层制成的夹层在0.345-13.78 MPa （50-2000 psig）的扩展压力范围内，在很宽的基质层厚度范围内燃烧的进一步结果。还考虑了在基体中包含纳米颗粒大小的燃烧速率催化剂。夹层燃烧速率在6.89-13.78 MPa （1000-2000 psig）压力范围内趋于稳定。这与氧化剂的双峰粒度分布和适当选择粗AP粒度的复合推进剂配方燃烧速率的相似平台趋势相关，其中细AP/粘结剂基质与三明治中测试的成分相同。研究了夹层燃烧速率与基体层厚和淬火表面特征的关系，以解释平台燃烧速率趋势。结果表明，在高压下，来自氧化剂/燃料扩散小片热的近表面部分的热反馈的二维耦合减弱，这是由于它们更接近燃烧表面，其横向范围相应缩小。
Further results on combustion of sandwiches made of alternating layers of ammonium perchlorate (AP) and a matrix of AP particles in polymeric binder in an expanded pressure range of 0.345-13.78 MPa (50-2000 psig), over a wide range of matrix lamina thicknesses, are reported. Inclusion of a nanoparticle-size burning rate catalyst in the matrix is also considered. The sandwich burning rates indicate plateaus over the 6.89-13.78 MPa (1000-2000 psig) pressure range for select ranges of matrix lamina thickness. These are correlated with similar plateau trends in the burning rates of composite propellant formulations with bimodal particle size distribution of the oxidizer and appropriate choice of coarse AP size, wherein the fine AP/binder matrices are of identical composition to those tested in the sandwiches. The dependence of the sandwich burning rates on the matrix lamina thickness and the quenched surface features are examined to explain the plateau burning rate trends. The results indicate that the two-dimensional coupling of heat feedback from the hot, near-surface parts of the oxidizer/fuel diffusion flamelets is diminished at elevated pressures due to their greater proximity to the burning surface and the corresponding shrinking of their lateral extent.