中心点火火焰在药床中传播规律的试验研究

薛绍; 陶如意; 王浩; 程申申

doi:10.11883/bzycj-2021-0030

中心点火火焰在药床中传播规律的试验研究

doi: 10.11883/bzycj-2021-0030

南京理工大学能源与动力工程学院, 江苏南京 210094

详细信息

作者简介:
薛　绍（1991－　），男，博士研究生，xue18761686700@163.com

通讯作者:
陶如意（1978－　），女，博士，副教授，tao801801@163.com

中图分类号: O381
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- 文章访问数: 370
- HTML全文浏览量: 168
- PDF下载量: 44
- 被引次数: 0
出版历程
- 收稿日期: 2021-01-21
- 修回日期: 2021-03-19
- 网络出版日期: 2021-09-27
- 刊出日期: 2021-11-23

Experimental research on the law of flame spreading in the charge bed of a central ignition tube

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

摘要

摘要: 为了研究中心点火管火焰在药床中的传播规律，设计了可视化模拟试验平台，开展了不同点火药量、不同装药结构的中心点传火试验。采用高速图像采集系统记录了中心点火管火焰在药床中的传播过程，采用瞬态压力记录仪记录膛内压力的时空变化。结果表明，点火药量为20 g时，出火时间为0.6 ms；点火药量为30 g时，出火时间为1.5 ms；杆状装药床的传火时间平均为2.2 ms，粒状装药床的传火时间平均为3.4 ms，而杆粒混装药床的传火时间为3.1 ms。可见，点火药量对药床出火时间影响显著，较大的点火药量导致药床出火时间延长；不同装药床结构传火性能差异较大，单一杆状装药床传火性能优于单一粒状装药和杆粒混装药床，并且粒状装药床易形成气体壅塞，膛内会出现明显的压力波动现象；根据火焰传播时序位置点，利用一阶指数衰减函数拟合建立了火焰传播过程数学模型，拟合优度大于0.98。
- 内弹道 /
- 可视化平台 /
- 点传火 /
- 传火模型
Abstract: In order to investigate the development of flame spreading in the charge bed of a central ignition tube, a visualized ignition experiment platform was designed, and experiments were carried out with different ignition charge masses and charge structures. A high-speed image acquisition system was used to record the propagation process of ignition flame in the propellant bed at 10000 frames per second, and a transient pressure recorder was used to obtain the variation of pressure with time and position in the chamber. In addition, a synchronous trigger was used to connect the high-speed image acquisition system, the transient pressure recorder and the ignition system of the experimental platform, giving the system a trigger zero point, which is convenient for the statistical analysis of subsequent experimental phenomena. The experimental results show that the time of flame-appearing from the ignition tube into the combustion chamber is 0.6 ms when the mass of the black powder is 20 g. However, the time increases to 1.5 ms when the mass of the black powder is 30 g. The average flame-spreading time of the stick charge structure is 2.2 ms, the average flame-spreading time of the granular charge structure is 3.4 ms, and the average flame-spreading time of the mixed charge structure is 3.1 ms. The results indicate that the mass of the black powder in an ignition tube has a significant effect on the time of flame-appearing from the ignition tube, and the higher black powder mass lead to the longer flame-appearing time. The performances of flame-spreading in different charge bed structures are quite different. The performance of flame-spreading in the stick charge structures is better than that in the granular charge structures and mixed charge structures. In addition, the pressure fluctuations will appear in the chamber due to gas choking in the granular charge structures. A mathematical model of the flame-spreading process was established by fitting the first-order exponential decay function according to the time sequence of the position of flame, and the goodness of fit is greater than 0.98.
- interior ballistic /
- visualization platform /
- ignition /
- mathematical model of the flame-spreading

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图 1 模拟试验系统流程图

Figure 1. Flow chart of the simulation experimental system

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图 2 可视化模拟装置

Figure 2. The visualization device for experimental investigation of propellant charge ignition

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图 3 中心点火管结构示意图

Figure 3. Schematic diagram of the central ignition tube

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图 4 测试现场布置

Figure 4. Arrangement of the test site

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图 5 不同装药结构

Figure 5. Different charging configurations

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图 6 不同试验方案火焰传播序列照片

Figure 6. High-speed photography of flame spreading through propellant charge in different cases

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图 7 方案1、3、5火焰传播位置

Figure 7. Flame positions along the propellant chamber during charge ignition of cases 1, 3 and 5

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图 8 各方案P₁、P₂、P₃测点的压力曲线

Figure 8. Pressure-time curves measured at measuring points P₁, P₂ and P₃ in each case

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表 1 各方案装填参数

Table 1. Charging parameters in each case

方案	电底火	点火药量/g	仿真发射药装药结构	仿真发射药量/kg	仿真发射药装填密度/(g·cm⁻³)
1	3#	20	单一杆状发射药	2.7	0.58
2	3#	30	单一杆状发射药	2.7	0.58
3	3#	20	单一粒状发射药	3.0	0.64
4	3#	30	单一粒状发射药	3.0	0.64
5	3#	20	杆状-粒状混装发射药	1.8（杆状），0.9（粒状）	0.58

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表 2 各方案传火时间

Table 2. Flame speeding time of each case

方案	t_L/ms	t_R/ms	t_t/ms
1	0.8	1.6	2.4
2	0.6	1.4	2.0
3	1.0	2.6	3.6
4	1.0	2.2	3.2
5	0.8	2.3	3.1

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表 3 方案1、3、5火焰传播位置函数拟合系数

Table 3. Exponential decay function coefficients in cases 1, 3 and 5

方案	火焰传播方向	A/mm	t₁/ms	X₀/mm
1	左	960.73748	5.48834	−746.77192
1	右	−2140.67126	10.28158	2129.96097
3	左	337.19979	0.96082	−65.56418
3	右	−670.86944	3.58306	675.19170
5	左	449.90302	1.92159	−216.47406
5	右	−567.63017	1.26204	458.43930

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表 4 各方案的最高压力和破膜压力

Table 4. The highest pressure and membrane-broken pressure in each case

方案	最高压力/MPa	破膜压力/MPa
1	2.51	0.98
2	2.82	0.96
3	2.53	0.85
4	2.91	1.00
5	2.63	1.10

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