丙烷/空气稀薄预混合气流动下的激光点火特性

张俊杰; 郭晓阳; 王朝君; 胡二江; 黄佐华

doi:10.13224/j.cnki.jasp.20210449

丙烷/空气稀薄预混合气流动下的激光点火特性

doi: 10.13224/j.cnki.jasp.20210449

西安交通大学动力工程多相流国家重点实验室，西安 710049

基金项目: 国家科技重大专项（2017- Ⅰ -0007-0033）

详细信息

作者简介:
张俊杰（1998-），男，硕士生，主要从事激光点火特性研究

通讯作者:
胡二江（1983-），男，教授，博士，主要从事航空发动机点火和燃烧调控研究。E-mail：hujiang@mail.xjtu.edu.cn

中图分类号: V233.3；TK401
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出版历程
- 收稿日期: 2021-08-13
- 网络出版日期: 2022-09-07

Laser ignition characteristics in propane/air lean premixed gas flow

State Key Laboratory of Multiphase Flow in Power Engineering，Xi’an Jiaotong University，Xi’an 710049，China

摘要

摘要:
基于流动点火平台，在不同当量比和流速下，对丙烷/空气稀薄预混气进行了激光点火实验。研究发现：随着当量比和流速的增加，火焰发展速度加快且火焰面积增大；火焰中的CH*发光强度随当量比提升有明显提高，通过CH*的分布及发光强度变化能判断火焰发展阶段。混合气的击穿和点火成功率都随当量比和流速的增加而增加，但改变当量比对成功率的影响比改变流速更大；通过击穿发射光谱中的H/N峰值强度比，可以判断混合气中各组分的含量变化，且使用标定线能确定未知预混合气的当量比。
- 激光点火 /
- CH*发光强度 /
- 击穿成功率 /
- 点火成功率 /
- 击穿发射光谱
Abstract:
Based on a flow-ignition platform, laser ignition experiments were carried out on the propane/air lean premixed gas for different equivalence ratios and velocities of flow. The study found that with the increase of the equivalence ratio and velocity of flow, the flame development speed increased and the flame area increased; the CH* luminous intensity in the flame increased significantly with the increase of the equivalence ratio, and the stage of flame development could be judged by the CH* distribution and luminous intensity changes. The probability of successful breakdown and ignition of the mixed-gas increased with the increase of the equivalence ratio and the velocity of flow, but the change of the equivalence ratio had a greater impact on the probability than the velocity of flow; the changes of the content of each component in the mixed gas could be judged by the H/N peak intensity ratio in the breakdown emission spectrum, and the calibration line could determine the equivalence ratio of the unknown premixed gas.
- laser ignition /
- CH* luminous intensity /
- probability of breakdown /
- probability of ignition /
- breakdown emission spectrum

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图 1 流动管激光点火实验系统图

Figure 1. Diagram of laser ignition in flow tube experimental system

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图 2 不同当量比下的火焰发展图片

Figure 2. Flame development pictures for different equivalence ratios

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图 3 不同流速下的火焰发展图片

Figure 3. Flame development pictures for different velocities of flow

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图 4 不同当量比下的CH*分布

Figure 4. CH* distribution for different equivalence ratios

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图 5 不同当量比下的CH*强度

Figure 5. CH* intensity for different equivalent ratios

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图 6 不同当量比下的击穿成功率

Figure 6. Probability of breakdown for different equivalence ratios

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图 7 不同流速下的击穿成功率

Figure 7. Probability of breakdown for different velocities of flow

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图 8 不同点火能量下的点火成功率与当量比的关系

Figure 8. Relationship between probability of ignition and equivalent ratio under different ignition energies

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图 9 不同当量比下的点火成功率

Figure 9. Probability of ignition for different equivalence ratios

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图 10 不同流速下的点火成功率

Figure 10. Probability of breakdown for different velocities of flow

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图 11 不同当量比和流速下的击穿发射光谱

Figure 11. Breakdown emission spectra for different equivalent ratios and velocities of flow

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图 12 不同流速下的H/N峰值强度比

Figure 12. H/N peak intensity ratio at different velocities of flow

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表 1 实验工况

Table 1. Experimental conditions

实验内容	当量比ϕ	流速/（m/s）	入射能量/mJ
火焰发展	0.63, 0.65, 0.68, 0.70	1	20
火焰发展	0.58, 0.60	1，2	100
CH*分布	0.65, 0.70	1	50
击穿	0.55, 0.60, 0.65, 0.70	1	7～12
击穿	0.55, 0.70	1，2	7～12
点火	0.55, 0.58, 0.60, 0.63, 0.65, 0.68, 0.70	1	20，40，80
	0.55, 0.58, 0.60, 0.63	1	20～120
	0.58, 0.60	1，2	20～120
发射光谱	0.40, 0.50, 0.60, 0.70	1	50
发射光谱	0.55, 0.70	1，2	50

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表 2 不同当量比的击穿成功率拟合参数及结果

Table 2. Fitting parameters and probability of breakdown for different equivalence ratios

当量比ϕ	C₁	C₂	E_b10/mJ	E_b50/mJ	E_b90/mJ
0.55	2.2868	0.0741	8.95	9.85	10.85
0.60	2.2756	0.0752	8.85	9.75	10.72
0.65	2.2526	0.0863	8.55	9.51	10.62
0.70	2.2398	0.0881	8.40	9.39	10.54

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表 3 不同流速的击穿成功率拟合参数及结果

Table 3. Fitting parameters and probability of breakdown for different velocities of flow

当量比ϕ	流速/（m/s）	C₁	C₂	E_b10/mJ	E_b50/mJ	E_b90/mJ
0.55	1	2.2868	0.0741	8.95	9.85	10.85
0.70	1	2.2398	0.0881	8.40	9.39	10.54
0.55	2	2.2632	0.0902	8.57	9.61	10.80
0.70	2	2.2137	0.1031	8.02	9.15	10.44

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表 4 不同当量比的点火成功率拟合参数及结果

Table 4. Fitting parameters and probability of ignition for different equivalence ratios

当量比ϕ	C₁	C₂	E₁₀/mJ	E₅₀/mJ	E₉₀/mJ
0.55	5.7408	0.9381	93.6	311.3	1035.4
0.58	4.4404	0.7058	34.3	84.8	209.6
0.60	3.9452	0.5967	24.1	51.7	111.5
0.63	3.2699	0.5752	6.9	26.3	55.0

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表 5 不同流速的点火成功率拟合参数及结果

Table 5. Fitting parameters and probability of ignition for different velocities of flow

当量比ϕ	流速/（m/s）	C₁	C₂	E₁₀/mJ	E₅₀/mJ	E₉₀/mJ
0.58	1	4.4404	0.7058	34.3	84.8	209.6
0.60	1	3.9452	0.5967	24.1	51.7	111.0
0.58	2	4.2019	0.5030	35.1	66.8	127.3
0.60	2	3.7247	0.5861	19.6	41.5	87.9

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表 6 不同流速下的H/N谱线强度比拟合参数

Table 6. Fitting parameters of H/N spectral line intensity ratio at different velocities of flow

H/N类型	流速/（m/s）	截距	斜率	R²
H656/N742	1	2.03676	11.79981	0.99913
H656/N744	1	1.24786	7.90578	0.99626
H656/N746	1	0.79749	6.04509	0.99973
H656/N742	2	2.29744	11.39219	0.99952
H656/N744	2	1.29392	7.93007	0.99628
H656/N746	2	0.81317	6.09856	0.99792

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