航空模型燃料与氢气掺混微尺度燃烧数值模拟

陈星赫; 苏晟; 王娟

doi:10.13224/j.cnki.jasp.20220769

航空模型燃料与氢气掺混微尺度燃烧数值模拟

doi: 10.13224/j.cnki.jasp.20220769

陈星赫^{1, 2},
苏晟^{1, 2},
王娟^{1, 2,*, ,}

1.
北京航空航天大学能源与动力工程学院，北京 100191
2.
北京航空航天大学航空发动机气动热力国家级重点实验室，北京 100191

基金项目: 国家自然科学基金（U2032119）

详细信息

作者简介:
陈星赫（1998-），男，硕士生，主要从事微尺度燃烧研究

通讯作者:
王娟（1976-），教授，博士，研究方向为催化燃烧、微尺度燃烧与生物质转化。E-mail：juanwang@buaa.edu.cn

中图分类号: V219
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- 被引次数: 0
出版历程
- 收稿日期: 2022-10-06
- 网络出版日期: 2024-03-14

Numerical simulation of micro-scale combustion characteristics of jet fuel surrogate/hydrogen mixtures

CHEN Xinghe^{1, 2},
SU Sheng^{1, 2},
WANG Juan^{1, 2,*
, ,}

1.
School of Energy and Power Engineering，Beihang University，Beijing 100191，China
2.
National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics，Beihang University，Beijing 100191，China

摘要

摘要:
对二维三级后台阶微燃烧器中以3种碳氢化合物（69% C₁₀H₂₂、11% C₉H₁₈、20% C₉H₁₂）混合的Jet A-1模型燃料与氢气的掺混在纯氧中的燃烧进行了数值模拟，分析了燃料掺氢比、进气流速对微燃烧器内燃烧特性的影响。结果表明，所有火焰均可以稳定在微燃烧器第一后台阶（距离微燃烧器入口3 mm处）之前。随着掺氢比增加，火焰位置逐渐前移，火焰长度缩短，且微燃烧器内部的高温区面积减少，最高温度降低，上游燃烧强度更高但下游更低，CO和CH₄质量分数减小，裂解反应的发生位置前移且裂解产物的质量分数降低。随着入口进气流速增加，燃烧反应的高温区扩大，火焰中心位置和火焰前沿向微燃烧器出口移动和拉伸，掺氢比对壁面温度的影响减小，微燃烧器中心线OH质量分数整体增加，CO₂质量分数减小，CH₄质量分数增加，且裂解反应的发生位置后移且产物质量分数增加。结果表明：低速下可以掺混少量氢气得到更高的壁温从而获取更多能量。低速可能影响燃烧区燃料燃烧时的化学反应，从而造成上游的OH生成量减小。掺氢比的增加以及流速的降低会使CO质量分数波动更加明显。CO₂的质量分数最高时的掺氢比为25%。在高掺氢比和低进气流速下，乙炔大部分是靠燃料直接裂解生成，只有少量是通过丙烯的二次裂解生成。
- 微尺度燃烧 /
- 掺氢比 /
- 燃烧特性 /
- 火焰位置 /
- 裂解
Abstract:
Abstract: The combustion of a Jet A-1 surrogate (69% C₁₀H₂₂, 11% C₉H₁₈ and 20% C₉H₁₂) and hydrogen in pure oxygen was simulated in a two-dimensional three-step back stage micro-scale combustor. The effects of hydrogen mixing ratio and inlet gas flow rate on the combustion characteristics in the combustor were analyzed. The results showed that all the flames can be stabilized before the first stage of the micro burner (3 mm away from the micro burner inlet). With the increase of hydrogen mixing ratio, the flame position gradually moved towards the micro burner inlet, the flame length was shortened, and the high-temperature area inside the micro burner reduced, the maximum temperature decreased, the upstream combustion intensity was higher but the downstream combustion intensity was lower, the mass fractions of CO and CH₄ decreased, the fuel cracking occurred closer to the micro burner inlet and the mass fractions of the cracking products decreased. With the increase of inlet gas flow rate, the high temperature zone of combustion reaction expanded, the flame center position and flame front moved and stretched towards the micro burner outlet, the influence of hydrogen mixing ratio on the wall temperature decreased, the OH mass fraction along the micro burner centerline increased, the CO₂ mass fraction decreased, the CH₄ mass fraction increased, and the cracking reactions occurred closer to the micro burner outlet and the mass fractions of the products increased. These results indicated that at low inlet gas flow rate, mixing a small amount of hydrogen can obtain high wall temperature and high energy. Low inlet gas flow rate may affect the chemical reaction in the combustion zone and reduce the amount of OH generated upstream. The increase of hydrogen mixing ratio and the decrease of flow rate can cause more obvious fluctuation of CO mass fraction. The hydrogen mixing ratio was 25% when the CO₂ mass fraction reached the highest amount. At high hydrogen mixing ratio and low inlet gas flow rate, acetylene was mostly generated by direct cracking of the fuel, and only a small amount was generated by secondary cracking of propylene.
- micro-scale combustion /
- hydrogen mixing ratio /
- combustion characteristics /
- flame position /
- cracking

HTML

图 1 微燃烧器物理模型（单位：mm）

Figure 1. Physical model of micro burner （unit：mm）

下载: 全尺寸图片幻灯片

图 2 不同网格数微燃烧器中心线温度分布

Figure 2. Temperature distribution at micro burner centerline with different grid numbers

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图 3 不同工况下微燃烧器温度分布图

Figure 3. Micro burner temperature distribution under different working conditions

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图 4 同一进气流速不同掺氢比下微燃烧器外壁面温度

Figure 4. Outer wall temperature of micro burner at the same inlet gas flow rate and different hydrogen mixing ratios

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图 5 同一掺氢比不同进气流速下微燃烧器外壁面温度

Figure 5. Outer wall temperature of micro burner under the same hydrogen mixing ratio and different inlet gas flow rates

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图 6 同一掺氢比不同进气流速下微燃烧器中心线OH质量分数分布

Figure 6. OH mass fraction distribution of micro burner centerline under the same hydrogen mixing ratio and different inlet flow rates

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图 7 同一掺氢比不同进气流速下微燃烧器中心线CO质量分数分布

Figure 7. CO mass fraction distribution at micro burner centerline under the same hydrogen mixing ratio and different inlet gas flow rates

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图 8 同一掺氢比不同进气流速下下微燃烧器中心线CO₂质量分数分布

Figure 8. CO₂ mass fraction distribution at micro burner centerline under the same hydrogen mixing ratio and different inlet gas flow rates

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图 9 同一进气流速不同掺氢比下微燃烧器中心线CO₂质量分数分布

Figure 9. CO₂ mass fraction distribution at micro burner centerline at the same inlet gas flow rate and different hydrogen mixing ratios

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图 10 不同工况下微燃烧器中心线裂解产物质量分数分布

Figure 10. Mass fraction distribution of pyrolysis products on centerline of micro burner under different working conditions

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表 1 各工况下的掺氢比及进气流速

Table 1. Hydrogen mixing ratio and inlet gas flow rate under various working conditions

工况	φ/%	v/（m/s）
Case 1	0	5
Case 2	0	7
Case 3	0	10
Case 4	25	5
Case 5	25	7
Case 6	25	10
Case 7	50	5
Case 8	50	7
Case 9	50	10
Case 10	75	5
Case 11	75	7
Case 12	75	10
Case 13	100	5
Case 14	100	7
Case 15	100	10

下载: 导出CSV

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