火花能量及相位对点火成功率影响的数值模拟

李晶茹; 黄勇

doi:10.13224/j.cnki.jasp.20230358

火花能量及相位对点火成功率影响的数值模拟

doi: 10.13224/j.cnki.jasp.20230358

李晶茹^{1, 2, 3,},
黄勇^{1, 2, 3,*, ,}

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
3.
先进航空发动机协同创新中心，北京 100191

基金项目: 国家科技重大专项（2017-Ⅲ-0007-0032）

详细信息

作者简介:
李晶茹（1999-），女，硕士生，主要从事航发燃烧室点熄火研究。E-mail：lijingrushanxi@163.com

通讯作者:
黄勇（1964-），男，教授、博士生导师，博士，主要从事燃烧室点火熄火机理及预测。E-mail：yhuang@buaa.edu.cn

中图分类号: V231.2
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出版历程
- 收稿日期: 2023-05-29
- 网络出版日期: 2024-07-09

Numerical simulation of the effect of spark energy and phase on ignition success rate

LI Jingru^{1, 2, 3
,},
HUANG Yong^{1, 2, 3,*
, ,}

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
3.
Collaborative Innovation Center for Advanced Aero-Engine，Beijing 100191，China

摘要

摘要:
为了研究火花能量及相位对航发燃烧室点火成功率的影响，采用大涡模拟（LES）方法对轴径向旋流器燃烧室点火过程进行模拟。模拟结果表明增大火花能量至10 J后点火仍具有随机性，同种可燃工况下单脉冲火花点火并非都能建立稳定火焰，且增大火花能量后火花相位对点火成功率的影响并没有得到改善，单个火花能量释放持续时间0.2 ms远小于流场脉动周期8.76 ms是造成火花相位严重影响点火结果的根本所在。在总点火能量相同的前提下在单脉冲点火失败的火花相位进行多脉冲点火，验证了在一个流场脉动周期内采用多个火花脉冲代替单个火花脉冲点火是减小随机性对点火成功率影响的有效途径。
- 大涡模拟 /
- 火花相位 /
- 火花能量 /
- 燃烧室 /
- 点火成功率
Abstract:
In order to study the effect of spark energy and phase on the ignition success rate of aeroengine combustion chamber, large eddy simulation （LES） method was used to simulate the ignition process of axial radial cyclone combustion chamber. The simulation results showed that the ignition was still random after increasing the spark energy to 10 J. Not all single pulse spark ignitions can establish a stable flame under the same combustible condition, and the influence of spark phase on ignition success rate was not improved after increasing the spark energy. The single spark energy release time of 0.2 ms was far less than the flow field pulsation period of 8.76 ms, mainly accounting for the serious influence of spark phase against the ignition result. Under the premise of the same total ignition energy, the multi-pulse ignition was carried out in the spark phase where the single pulse ignition failed. It was proved that using multiple spark pulses instead of single spark pulse ignition is an effective way to reduce the influence of randomness on ignition success rate in a flow field pulsation period.
- large eddy simulation /
- spark phase /
- spark energy /
- combustion chamber /
- ignition success rate

HTML

图 1 矩形燃烧室

Figure 1. Rectangular combustion chamber

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图 2 燃烧室计算域网格

Figure 2. Combustor computing domain grid

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图 3 不同网格燃烧室中心轴线处回流区长度

Figure 3. Length of recirculation zone at the center axis of different mesh combustor

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图 4 不同轴向位置轴向速度分布

Figure 4. Axial velocity distribution at different coaxial locations

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图 5 不同轴向位置径向速度分布

Figure 5. Radial velocity distribution at different coaxial locations

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图 6 不同轴向位置油气比径向分布

Figure 6. Fuel-gas ratio radial distribution at different axial locations

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图 7 火焰传播发展过程

Figure 7. Flame propagation development process

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图 8 Ahmed等实验火焰图像^[31]

Figure 8. Ahmed et al. experimental flame images^[31]

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图 9 63 ms单个火花脉冲动态点火过程

Figure 9. Single spark pulse dynamic ignition process at 63 ms

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图 10 79 ms单个火花脉冲动态点火过程

Figure 10. Single spark pulse dynamic ignition process at 79 ms

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图 11 67 ms单脉冲火花点火热释放率变化图

Figure 11. Variation diagram of 67 ms single pulse spark ignition heat release rate

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图 12 67 ms单脉冲火花点火热释放率变化局部放大图

Figure 12. Partial enlarged view of 67 ms single pulse spark ignition heat release rate change

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图 13 18 ms内单脉冲火花点火热释放率变化图

Figure 13. Single pulse spark ignition heat release rate change in 18 ms

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图 14 63 ms时启动8个火花脉冲点火时功率随时间变化

Figure 14. Power varies with time when the eight spark pulses are fired at 63 ms

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图 15 63 ms时8个火花脉冲动态点火过程

Figure 15. Eight spark pulses dynamic ignition processes at 63 ms

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表 1 增厚火焰模型作用前、后各参数对比

Table 1. Comparison of parameters before and after thickening flame model

参数	层流火焰	增厚湍流火焰
扩散系数	D	$ \varOmega $FD
指前因子	A	EA/F
火焰速度	$ S\mathrm{_l} $	$ ES_{\mathrm{l}} $
火焰厚度	$ \delta_{\mathrm{l}} $	F$ \delta\mathrm{_l} $

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表 2 边界条件物理参数值

Table 2. Boundary condition physical parameter values

参数	数值
入口空气温度/K	300
燃油温度/K	300
出口压力/kPa	101
空气质量流量/（g/s）	120
煤油质量流量/（g/s）	3.2

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表 3 所涉及算例点火情况总结

Table 3. Summary of the ignition situation of the example involved

点火时刻/ms	点火情况
点火时刻/ms	能量为2 J	能量为10 J
60	√	×
62	×	×
63	×	×
66	×	×
67	√	×
68	×	×
73	×	×
74	×	×
75	√	×
79	×	√

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