用于爆轰驱动的射流起爆实验研究

陆星宇; 李进平; 陈宏; 俞鸿儒

doi:10.11883/bzycj-2018-0223

用于爆轰驱动的射流起爆实验研究

doi: 10.11883/bzycj-2018-0223

陆星宇^{1, 2,},
李进平^2, ,,
陈宏^{1, 2},
俞鸿儒²

1.
中国科学院大学工程科学学院，北京 100049
2.
中国科学院力学研究所高温气体动力学国家重点实验室，北京 100190

基金项目: 国家自然科学基金（11472280）；中国科学院“关键技术人才”项目

详细信息

作者简介:
陆星宇（1989－　），男，博士研究生，luxingyu@imech.ac.cn

通讯作者:
李进平（1978－　），男，博士，高级工程师，lijinping@imech.ac.cn

中图分类号: O381；O358
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- 被引次数: 0
出版历程
- 收稿日期: 2018-06-20
- 修回日期: 2018-07-26
- 网络出版日期: 2019-05-25
- 刊出日期: 2019-06-01

Experimental study on jet initiation for detonation driver

LU Xingyu^{1, 2
,},
LI Jinping^{2
, ,},
CHEN Hong^{1, 2},
YU Hongru²

1.
School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
2.
State Key Laboratory of High-Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China

摘要

摘要: 爆轰驱动激波风洞的自由来流模拟范围与驱动气体的爆轰极限密切相关，爆轰极限越宽则模拟范围越大。驱动气体一般是通过点火管进行起爆的，提高点火管的起爆能力可以拓宽爆轰极限。为了提高点火管起爆能力，就点火管口径、点火气体爆轰敏感性和单/双点火管3种因素的影响进行了实验研究。在不同的点火管初始条件下，对驱动段波速进行了测量。结论如下：（1）提高点火管口径可以显著提升起爆能力；（2）点火气体爆轰敏感性对起爆能力有影响，点火管为缩径内型面时，低敏感性气体起爆能力更强，点火管为等径内型面时则低敏感性气体和高敏感性气体的起爆能力大体持平；（3）在保证射流同步的前提下，双点火管能够提高起爆能力，为保证射流同步性需使用化学恰当比的氢氧混气等爆轰敏感性强的点火气体。
- 爆轰 /
- 湍流射流 /
- 起爆 /
- 激波风洞 /
- 爆轰驱动
Abstract: The free-flow simulation range of the detonation driven shock tunnel is closely related to the detonation limit of the driving gas. The wider the detonation limit, the larger the simulation range. The driving gas is generally detonated through the igniter (ignition tube). Increasing the detonation capability of the ignition tube can broaden the detonation limit. In order to improve the ignition capacity of the igniter, the effects of three factors, the diameter of the ignition tube, the detonation sensitivity of the ignition gas, and the single/double igniter tube, were investigated experimentally. The velocity of the driven segment was measured under different initial conditions in the igniters. The conclusions are as follows. Firstly, improving the caliber of the ignition tube can significantly enhance the ability to initiate. Secondly, the ignition gas detonation sensitivity has an impact on the detonation capability: when the igniter is a reduced-diameter internal profile, the low-sensitivity gas has a stronger detonation capability; when the igniter pipe is of the same diameter internal profile, the result is reversed. Finally, if the synchronization of the jets can be ensured, the double igniters can improve the detonation ability. In order to ensure the synchronization, it is necessary to use a sensitive ignition gas like hydrogen oxygen mixtures of equivalent ratio.
- detonation /
- turbulent jet /
- detonation initiation /
- shock tunnel /
- detonation driver

HTML全文

图 1 爆轰驱动激波风洞及射流起爆过程示意图

Figure 1. Schematics of detonation driven shock tunnel and jet initiation process

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图 2 BBF-100激波管（a）与点火管（b）～（e）

Figure 2. BBF-100 shock tube (a) and igniters (b)–(e)

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图 3 不同点火管的驱动气体爆燃压力波或爆轰波速度分布

Figure 3. Driver gas deflagration pressure wave or detonation wave velocity distribution of different igniters

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图 4 射流火焰与膜片

Figure 4. Jet flame and diaphragms

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图 5 不同点火气体组分对应的驱动气体爆燃压力波或爆轰波速度分布

Figure 5. Driver gas deflagration pressure wave or detonation wave velocity distribution for different ignition gas components

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图 6 单/双点火管的驱动气体爆燃压力波或爆轰波速度分布

Figure 6. Driver gas deflagration pressure wave or detonation wave velocity distribution in single/double igniters

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图 7 双点火管射流过程((a)～(c)为示意图, (d)～(g)为2CO+O₂时序照片,（h)～(k)为2H₂+O₂时序照片)

Figure 7. Double igniters jet process ((a)−(c) are schematics, (d)−(g) are sequential photos of 2CO+O₂ jets, (h)−(k) are sequential photos of 2H₂+O₂ jets)

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表 1 点火管火焰传播时间

Table 1. Igniter flame propagation time

Ingredients	$\varnothing $/mm	t_p，m/ms	σ（t_p）/ms	t_f，m/ms	σ（t_f）/ms
2CO+O₂	20	13.370	2.219	13.907	2.253
2CO+O₂	30	12.050	1.293	12.543	1.295
2H₂+O₂	30	0.405	0.019	0.395	0.021

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