预点火湍流对正戊烷云雾爆炸参数的影响

刘雪岭; 张奇

doi:10.11883/bzycj-2017-0458

预点火湍流对正戊烷云雾爆炸参数的影响

doi: 10.11883/bzycj-2017-0458

刘雪岭^1,,
张奇²

1.
贵州理工学院矿业工程学院，贵州贵阳 550003
2.
北京理工大学爆炸科学与技术国家重点实验室，北京 100081

基金项目: 贵州省科技支撑计划（201805330030620551）

详细信息

作者简介:
刘雪岭（1972－　），男，博士研究生，副教授，fanyanmusic@126.com

中图分类号: O389
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- 被引次数: 0
出版历程
- 收稿日期: 2017-12-29
- 修回日期: 2018-03-10
- 网络出版日期: 2019-03-25
- 刊出日期: 2019-03-01

Influence of pre-ignition turbulence intensity on n-pentane mists explosion

LIU Xueling^1
,,
ZHANG Qi²

1.
School of Mining Engineering, Guizhou Institute of Technology, Guiyang, 550003, China
2.
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China

摘要

摘要: 以正戊烷云雾为研究对象，进行预点火湍流对云雾爆炸参数影响规律的实验研究。首先通过不同气动压力进行喷雾，获得平均特征直径（SMD）分别为 21.21、14.51 和 8.64 μm 的正戊烷云雾，并得到不同气动压力预点火的湍流均方根速度；随后在 20 L 云雾爆炸参数测量系统中实验获得预点火湍流对正戊烷云雾蒸发速率、爆炸超压峰值、压力上升速率和火焰传播延迟时间的影响。结果表明：(1) 对于圆柱形罐体对称式双喷头分散系统，流场环境可近似认定为零平均速率湍流场；在0.4、0.6和0.8 MPa的气动压力喷雾50 ms的分散作用下，在100～250 ms内，湍流均方根速度在1.0～6.2 m/s范围内，平均湍流积分尺度在40～72 mm范围内，湍流最大湍流尺度的雷诺数在8 000～15 000范围内，柯尔莫哥洛夫微尺度在0.03～0.1 mm范围内；(2) 对于较小的液滴群，随湍流强度的增加，液滴群的蒸发速率有更为明显的提升；(3) 对比云雾三种SMD，粒径8.64 μm的超压峰值与最大压力上升速率随湍流强度增长趋势更显著，并发生爆炸强度显著提升现象，即存在“转变区域”（transition range）现象；(4) 对于SMD在8～22 μm范围内，湍流均方根速度处于1.0～4.0 m/s时为火焰传播延迟时间的低增长阶段，湍流均方根速度处于4.0～6.2 m/s时为火焰传播延迟时间的高增长阶段，湍流强度与火焰传播延迟时间在相应的两个湍流强度阶段范围内呈线性增长。
- 湍流强度 /
- 云雾浓度 /
- 云雾粒径 /
- 爆炸参数 /
- 火焰传播
Abstract: In this paper we investigated the influence of the pre-ignition turbulence intensity on the explosion parameters of n-pentane mists. By using 0.4, 0.6 and 0.8 MPa of pneumatic pressure spray, we obtained n-pentane mists with the Sauter mean diameter (SMD) of 21.21, 14.51 and 8.64 μm, and at the same time, the pre-ignition turbulence intensity under different pneumatic pressures. Then, in a 20 L mists explosion parameter measuring system for experimental research, we aquired the influence of the pre-ignition turbulence on the evaporation rate, the peak explosion overpressure, the explosion pressure rise rate and the ignition delay time of n-pentane mists. The results showed that, the average turbulence velocity of the enviromental fluid field was zero. The smaller the droplet size was, the more obvious was the increase of the evaporation rate of the mists with the increase of the turbulence intensity. At the same time, for the SMDs of 14.51 and 21.21 μm, the peak pressure and the maximum pressure rise rate increased more obviously with the SMD of 8.64 μm, and the explosion intensity was significantly strong, suggesting the existence of a transition range. For the SMDs in the range of 8−22 μm, the mean square turbulence velocity in 1.0−4.0 m/s was the low growth stage of the flame propagation delay time, whereas that in 4.0−6.2 m/s was the high growth stage. The turbulence intensity and the flame propagation delay time exhibited a linear growth in both stages.
- turbulence intensity /
- mist concentration /
- particle size of mists /
- explosive parameters /
- flame propagation

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图 1 瞬态浓度与粒径测量系统构成示意图

Figure 1. The measurement system on mists concentration and diameter

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图 2 云雾湍流测量系统构成示意图

Figure 2. The measurement system of turbulence

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图 3 云雾爆炸参数测量系统示意图

Figure 3. Schematic diagram on mists explosion parameters

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图 4 圆柱型罐喷头示意图

Figure 4. Schematic diagram of nozzle

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图 5 正戊烷云雾浓度随时间变化趋势

Figure 5. The concentrations of n-pentane vs. time

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图 6 正戊烷云雾平均特征直径（D₃₂）随时间变化趋势

Figure 6. SMDs (D₃₂) of n-pentane vs. time

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图 7 气动压力为0.4 MPa时湍流强度随时间的变化

Figure 7. Turbulence intensity vs. time at pneumatic pressure of 0.4 MPa

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图 8 喷雾压力为0.4 MPa时片光2处罐内湍流分布

Figure 8. Turbulence intensity distribution at pneumatic pressure of 0.4 MPa at location 2

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图 9 湍流均方根速度v_rms与蒸发速率V（t）的关系

Figure 9. Relation between root-mean-square velocities (v_rms) and evaporation rate (V(t))

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图 10 湍流均方根速度（v_rms）与超压峰值（p_max）的关系

Figure 10. Relationship between root-mean-square velocities (v_rms) and maximum overpressure (p_max)

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图 11 湍流均方根速度（v_rms）与最大超压上升速率（${\dot p_{{\rm{max}}}}$）的关系

Figure 11. Relationship between root-mean-square velocities (v_rms) and maximum increasing rate of overpressure (${\dot p_{{\rm{max}}}}$)

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图 12 不同粒径正戊烷云雾爆炸超压（v_rms）及最大压力上升速率（${\dot p_{{\rm{max}}}}$）对比（v_rms=4 m/s)

Figure 12. Comparison of root-mean-square velocities (v_rms) and maximum increasing rate of overpressures (${\dot p_{{\rm{max}}}}$) at different particle size (v_rms=4 m/s)

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图 13 云雾爆炸过程典型的超压历程

Figure 13. Aerosols explosion process

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图 14 正戊烷云雾爆炸火焰传播过程

Figure 14. Flame propagation process on n-pentane/air aerosols

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图 15 湍流均方根速度（t*）与火焰传播延迟时间（v_rms）的关系

Figure 15. Flame propagation delay time (t*) vs. root-mean-square velocities (v_rms)

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表 1 正戊烷云雾湍流强度及浓度粒径实验统计结果

Table 1. Experiment results of turbulence intensity and concentration

气动压力/ MPa	时刻/ ms	v_rms/ （m·s⁻¹）	D₃₂/ μm	质量浓度/（g·m⁻³）
气动压力/ MPa	时刻/ ms	v_rms/ （m·s⁻¹）	D₃₂/ μm	总体	液相	气相
0.8	100	6.2	8.64	454	340	137
	150	4.0		452	327	148
	200	2.5		451	315	158
	250	2.0		449	304	167
0.6	100	5.0	14.51	454	320	134
	150	3.5		452	307	145
	200	2.2		451	296	151
	250	1.5		449	285	164
0.4	100	4.0	21.21	454	299	132
	150	3.0		452	288	142
	200	2.0		451	277	152
	250	1.0		449	267	160
注：v_rms为流场均方根速度

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表 2 不同气动喷雾压力下湍流积分尺度及雷诺数

Table 2. Average turbulence integral scale and Reynolds numbers at different dispersing air pressures

时间/ms	${\ell _0}$/mm			$Re_{{\ell _0}}^{}$
时间/ms	0.8 MPa	0.6 MPa	0.4 MPa	0.8 MPa	0.6 MPa	0.4 MPa
100	40	45	48	16 300	15 600	15 000
150	55	57	58	12 600	12 000	11 700
200	65	68	70	9 200	8 700	8 400
250	67	69	72	8 600	8 500	8 000

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