不同升温速率下AP/HTPB底排装置慢速烤燃的数值模拟

李文凤; 余永刚; 叶锐; 杨后文

doi:10.11883/1001-1455(2017)01-0046-07

不同升温速率下AP/HTPB底排装置慢速烤燃的数值模拟

doi: 10.11883/1001-1455(2017)01-0046-07

南京理工大学能源与动力工程学院, 江苏南京 210094

基金项目:

国家自然科学基金项目 51176076

详细信息

作者简介:
李文凤(1990—)，男，博士研究生

通讯作者:
余永刚，yyg801@njust.edu.cn

中图分类号: O389
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出版历程
- 收稿日期: 2015-05-18
- 修回日期: 2015-09-17
- 刊出日期: 2017-01-25

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

School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China

摘要

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。
- 爆炸力学 /
- 升温速率 /
- 慢速烤燃 /
- 底排装置 /
- AP/HTPB
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.
- mechanics of explosion /
- heating rate /
- slow cook-off /
- base bleed /
- AP/HTPB

HTML全文

图 1 底排装置示意图

Figure 1. Schematics of base bleed unit

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图 2 网格尺寸图

Figure 2. Grid size chart

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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

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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

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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

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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

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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

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表 1 AP/HTPB推进剂的动力学参数^[10]

Table 1. Parameters of AP/HTPB propellant^[10]

反应步骤 D_i E_i/(kJ·mol^-1) q_i/(kJ·kg^-1)

1 800 137.18 -297.0

2 1 100 178.75 9 643.2

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表 2 物性参数^{[3, 11]}

Table 2. Parameters of materials^{[3, 11]}

材料 ρ/(kg·m^-3) λ/(W·m^-1·K^-1) c_p/(J·kg^-1·K^-1)

壳体 8 030 16.270    502.48

底排药 1 826   0.389 1 255.20

包覆层    950   0.276 2 860.00

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