Simulation of cook-off for AP/HTPB composition propellant in base bleed unit at different heating rates
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摘要: 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。Abstract: 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.
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Key words:
- mechanics of explosion /
- heating rate /
- slow cook-off /
- base bleed /
- AP/HTPB
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图 3 中心点温度时程曲线计算与实验对比
Figure 3. Comparison of the temperature histories at center point in calculation and experiment
图 4 不同时刻下装置的温度分布云图
Figure 4. Contour of temperature distribution on the unit at different times
图 5 3种升温速率下装置在不同时刻的温度分布云图
Figure 5. Contour of temperature distribution on the unit at different times at different heating rates
图 6 各特征点在不同升温速率下的温升曲线
Figure 6. Histories of temperature at the feature points at different heating rates
图 7 不同升温速率下烤燃响应点的温升曲线
Figure 7. Histories of temperature at the cook-off response point at different heating rates
反应步骤 Di Ei/(kJ·mol-1) qi/(kJ·kg-1) 1 800 137.18 -297.0 2 1 100 178.75 9 643.2 
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