掺氢比对甲烷-氧气爆轰特性的影响

倪靖; 潘剑锋; 姜超; 陈祥; 张顺

doi:10.11883/bzycj-2019-0237

掺氢比对甲烷-氧气爆轰特性的影响

doi: 10.11883/bzycj-2019-0237

江苏大学能源与动力工程学院，江苏镇江 212013

基金项目: 国家自然科学基金（91641113）

详细信息

作者简介:
倪　靖（1996－　），男，硕士研究生，a1437407300@163.com

通讯作者:
潘剑锋（1978－　），男，博士，教授，mike@ujs.edu.cn

中图分类号: O382
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- 被引次数: 0
出版历程
- 收稿日期: 2019-06-13
- 修回日期: 2019-09-30
- 刊出日期: 2020-04-01

Effects of hydrogen-blending ratio on detonation characteristics of premixed methane-oxygen gas

School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China

摘要

摘要: 含氢多组分燃料由于其优良的燃烧特性逐渐成为研究关注的重点。为了对掺氢燃料的爆轰特性作进一步的研究，设计了长3 000 mm、管径30 mm的圆柱形半封闭燃烧室，对不同初压下的CH₄-2O₂、6CH₄-H₂-12.5O₂、3CH₄-H₂-6.5O₂（掺氢比分别为0%、5.1%、9.5%）3种预混合气的爆轰特性进行了实验研究，并采用烟熏膜、离子探针和压力传感器分别探测胞格结构、火焰位置和内部压力。结果表明，甲烷/氧气掺氢后可以有效提高爆轰波的传播速度，且掺氢浓度越高，传播速度越快；同时，氢气的掺入可减少管道出口处的速度亏损并在初始压力较低时加速火焰和激波的耦合，降低胞格尺寸，提高爆轰敏感性。
- 爆轰波 /
- 爆轰胞格尺寸 /
- 掺氢比 /
- 爆轰敏感性
Abstract: Hydrogen-doped fuel has gradually become the focus of research due to its excellent combustion characteristics. In order to further study the detonation characteristics of hydrogen-doped fuel, a cylindrical semi-enclosed tube with the length of 3 000 mm and the diameter of 30 mm was designed. The detonation characteristics of three premixed gases, CH₄-2O₂, 6CH₄-H₂-12.5O₂ and 3CH₄-H₂-6.5O₂ (hydrogen ratio is 0%, 5.1% and 9.5%, respectively), were studied experimentally under different initial pressures. Smoked foils, ion probes and pressure sensors were used to measure the cell structures, the flame positions and the internal pressures, respectively. The results show that hydrogen-doped methane/oxygen can effectively increase the propagation velocity of detonation waves, and the higher the concentration of hydrogen, the faster the propagation velocity. In addition, hydrogen can reduce the velocity loss at the outlet of the tube and accelerate the coupling of flame and shock wave at lower initial pressures, reduce the cell size and improve detonation sensitivity.
- detonation wave /
- detonation cell size /
- ratio of mixing hydrogen /
- detonation sensitivity

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图 1 实验系统

Figure 1. Experimental system

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图 2 点火系统等效R-L-C电路^[17]

Figure 2. An equivalent R-L-C circuit of the ignition system^[17]

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图 3 CH₄-2O₂激波与火焰的相互作用过程

Figure 3. Time evolution of shock-flame interaction for CH₄-2O₂

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图 4 6CH₄-H₂-12.5O₂激波与火焰的相互作用过程

Figure 4. Time evolution of shock-flame interaction for 6CH₄-H₂-12.5O₂

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图 5 3CH₄-H₂-6.5O₂激波与火焰的相互作用过程

Figure 5. Time evolution of shock-flame interaction for 3CH₄-H₂-6.5O₂

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图 6 不同初压下管道中各点火焰速度与CJ速度的比值

Figure 6. Ratios of flame velocity to CJ velocity at each point in the pipeline under different initial pressures

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图 7 不同掺氢比下爆轰波稳定传播平均速度随初压的变化

Figure 7. Average velocity of steady propagation of detonation wave varying with initial pressure at different hydrogen-blending ratios

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图 8 不同掺氢比、不同初始压力下管道中各点压力峰值的分布情况

Figure 8. Distribution of the pressure peak at each point in the pipeline under different hydrogen-blending ratios and different initial pressures

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图 9 初始压力为20.0 kPa时3种气体的胞格结构

Figure 9. Cellular structures of three gases at the initial pressure of 20.0 kPa

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图 10 初始压力为30.0 kPa时3种气体的胞格结构

Figure 10. Cellular structures of three gases at the initial pressure of 30.0 kPa

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图 11 初始压力为40.0 kPa时3种气体的胞格结构

Figure 11. Cellular structures of three gases at the initial pressure of 40.0 kPa

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图 12 不同掺氢比下胞格尺寸随初始压力的变化

Figure 12. Change of cell size with initial pressure at different hydrogen-blending ratios

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表 1 实验气体组分

Table 1. Experimental gas compositions

气体编号气体配比氢气摩尔分数/%

#1 CH₄-2O₂ 0
#2 6CH₄-H₂-12.5O₂ 5.1
#3 3CH₄-H₂-6.5O₂ 9.5

下载: 导出CSV

表 2 爆轰胞格尺寸$\lambda $与初始压力p₀之间的拟合关系参数

Table 2. Parameters for fitting relationship between detonation cell size λ and initial pressure p₀

掺氢比/% C/mm b

0 688.229 57 1.149 81
5.1 515.502 93 1.096 92
9.5 977.119 24 1.347 64

下载: 导出CSV

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