增强型喷射器对爆轰波DDT过程的影响

饶飞雄; 雷知迪; 丁珏; 翁培奋

doi:10.11883/bzycj-2017-0284

增强型喷射器对爆轰波DDT过程的影响

doi: 10.11883/bzycj-2017-0284

上海大学应用数学和力学研究所, 上海 200072

基金项目:

国家自然科学基金 11472167

详细信息

作者简介:
饶飞雄(1989-), 男, 硕士研究生, 1052115992@qq.com

通讯作者:
丁珏(1973-), 女, 博士, 副研究员, dingjue_lu@shu.edu.cn

中图分类号: O381
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- 被引次数: 0
出版历程
- 收稿日期: 2017-07-10
- 修回日期: 2017-10-18
- 刊出日期: 2019-02-05

Influence of an enhanced injector on DDT process

Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China

摘要

摘要: 在激波、火焰及射流同时存在的流场中，组织燃烧转爆轰过程是脉冲爆震发动机实现点火、起爆的关键问题。设计一类喷射器，采用C₂H₂/O₂/Ar反应，数值验证了该喷射器能增强爆震室燃料燃烧转爆轰的可行性，并讨论了流场中热点的点火机制。结果显示：该装置在流场中可激发不稳定性，产生漩涡，加速能量、质量的交换。流场产生热点，促进火焰速度加快，追赶前导激波。喷射器位置影响前导激波的运动速度。在一定范围内，前导激波速度越大，碰撞产生的热点越容易激发燃烧转爆轰过程。
- 脉冲爆震发动机 /
- 燃烧转爆轰 /
- 喷射器 /
- 热点 /
- 火焰速度
Abstract: In the flow where the shock wave, the flame and the jet exist simultaneously, the successful process of deflagration to detonation transition (DDT) is the key to the pulse detonation engine (PDE). One kind of injector was designed, and the feasibility of enhancing deflagration to detonation transition in detonation chamber was validated by numerical simulation based on C₂H₂/O₂/Ar reaction. The mechanism analysis of the hot spot initiating detonation was made. The device can excite instability in the flow field, generate eddies, and accelerate the exchange of energy and mass. The flow field generates hot spots, which accelerate the flame speed and catch up with the leading shock wave. The position of the ejector affects the velocity of the leading shock wave. Within a certain range, the higher the velocity of the leading shock wave is, the easier the hot spot generated by the collision will trigger the combustion-to-detonation transition process.
- pulse detonation engine /
- deflagration to detonation transition /
- injector /
- hot spot /
- flame speed

HTML全文

图 1 爆轰波结构

Figure 1. Single detonation cell pattern

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图 2 计算区域和喷射器示意图

Figure 2. Sketch of computation field and injector

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图 3 喷射器影响下燃烧转爆轰的DDT过程

Figure 3. DDT process affected by the injector

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图 4 流场参数的分布

Figure 4. Distribution of flow parameters

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图 5 沿x正方向的火焰速度

Figure 5. Flame propagation velocity along x positive direction

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图 6 前导激波速度与喷射器位置关系

Figure 6. Relation between leading shock velocity and injector position

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图 7 通过喷射器流场的火焰分布

Figure 7. Distribution of the flame through the injector

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图 8 喷射器不同表面阻断率下热点位置附近流场的参数

Figure 8. Flow parameters near the hot spots formed at different blocking rates

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图 9 反应阵面的热释放率时程曲线

Figure 9. Histories of release heat rate at the reaction front

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表 1 验证算例中爆轰参数

Table 1. Detonation parameters in verification example

爆速/(m·s^-1)			温度/K			压力/MPa
实验	C-J理论	计算	实验	C-J理论	计算	实验	C-J理论	计算
2 825	2 853	2 819.36	3 583	-	3 682.75	1.86	1.86	1.91

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表 2 有/无喷射器时爆轰波状态对比

Table 2. Comparison of detonation wave state with or without injector

状态	时间/μs	前导激波位置/cm	是否形成稳定爆轰波
无喷射器	350	28.22	否
带喷射器	218	28.23	是

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表 3 喷射器位置对爆轰波的影响

Table 3. Influence of injector positions on detonation

喷射器位置/cm	爆轰波波面位置/cm	是否形成稳定爆轰波
3.8	-	否
3.9	35.72	是
4.0	35.74	是
5.0	34.63	是
7.0	32.65	是
9.0	29.84	是
11.0	26.02	否

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表 4 喷射器表面阻断率对爆轰波形成和发展的影响

Table 4. Influence of the blocking rate of injector on detonation

表面阻断率	时间/μs	爆轰波波面位置/cm	是否形成稳定爆轰波
0.400	228	-	否
0.444	228	32.45	是
0.462	228	32.52	是
0.471	228	32.65	是

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