不同升温速率下AP/HTPB底排装置慢速烤燃的数值模拟

为研究在不同升温速率下高氯酸铵(ammonium perchlorate, AP)/端羟基聚丁二烯(tydroxyl-terminated polybutadiene, HTPB)底排装置的慢速烤燃特性，建立AP/HTPB底排推进剂二维轴对称非稳态传热模型和两步化学动力学反应模型。在不同升温速率下，分析底排装置的慢速烤燃响应特性。计算结果表明:在慢速烤燃的条件下，烤燃响应点发生在底排药柱与空气腔的接触面左侧，升温速率对底排药柱的着火延迟时间和烤燃响应点位置有较大影响。随着升温速率的提高，着火延迟时间变短，烤燃响应点向中心侧移动。升温速率对烤燃响应点的着火温度影响较小。

Simulation of cook-off for AP/HTPB composition propellant in base bleed unit at different heating rates

To investigate the characteristics of the AP/HTPB composition propellant at different heating rates in the slow cook-off, we constructed a a model consisting of two-dimensional unsteady-state heat transfer and two-step chemical reaction kinetics. The characteristics of the composition propellant at the heating rates of 3.3, 4.7 and 6 K/h were analyzed respectively. The results show that the ignition position occurs in the left side of the interface between the propellant and the gas. The heating rate has a great effect on the ignition time and the position for the composition propellant. As the heating rate increases, the ignition delay time decreases and the ignition position moves to the right. The change of the heating rate has limited impact on the ignition delay temperature.