脉冲热射流强化混合燃烧的数值模拟研究

杜胜杰; 熊姹; 赵明灏; 齐彦鹏; 邱华

doi:10.13224/j.cnki.jasp.20240316

脉冲热射流强化混合燃烧的数值模拟研究

doi: 10.13224/j.cnki.jasp.20240316

西北工业大学动力与能源学院，西安 710129

基金项目: 国家自然科学基金“叶企孙”科学基金（U2241272）

详细信息

作者简介:
杜胜杰（2000-），男，助理工程师，硕士，主要从事燃烧流动推进应用研究

通讯作者:
邱华（1978-），男，教授，博士，主要从事爆震推进的应用基础研究。E-mail：qiuhua@nwpu.edu.cn

中图分类号: V231.2
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出版历程
- 收稿日期: 2024-05-16
- 网络出版日期: 2026-01-14

Numerical simulation study of mixing and combustion enhancement with pulse thermal jet

School of Power and Energy，Northwestern Polytechnical University，Xi’an 710129，China

摘要

摘要:
为了提升高亚声速来流工况下的燃料与空气的混合燃烧效率，缩短燃烧室轴向距离，通过采用自定义边界条件模拟旋转爆震室出口的高频脉动燃烧产物设置脉冲热射流，对同轴分层供给的非预混气体混合燃烧过程展开强化研究，分析了不同射流频率和射流角度对油-气混合过程的影响，以及不同的主、射流参数和双孔喷射方式对射流强化掺混燃烧过程的影响。结果表明：在本文工作条件下，存在最佳的强化混合过程的射流频率20 kHz及对应射流角度60°；增高主流来流温度以及减小填充燃料比例，均可明显提高燃烧效率；采用双孔射流方式可以改变流场结构，对油气混合形式产生影响，大幅提高混合和燃烧效率，在两射流孔直径比为0.75∶0.25、轴向距离之比为2.5∶1、喷射相位差为0.8时，周期平均燃烧效率达到98%。
- 脉冲热射流 /
- 非预混气体 /
- 亚声速 /
- 强化混合 /
- 强化燃烧
Abstract:
In order to improve the mixing and combustion efficiency of fuel and air under high subsonic speed flow conditions and shorten the axial distance of the combustion chamber, conducting a study on the intensified mixing and combustion process of non-premixed gas with coaxial layered supply by simulating rotational detonation high-frequency pulsating combustion product setting pulse thermal jet through custom boundary conditions. It analyzes the effects of different jet frequencies and jet angles on the oil-gas mixing process, as well as the effects of different mainstream and jet parameters and dual-jet injection method on the mixing combustion process of jet strengthening. The results indicate that there is an optimal jet frequency of 20 kHz and a jet angle of 60° for the intensified mixing process under the working conditions of this article. Increasing the mainstream temperature and reducing the proportion of filling fuel can effectively improve the combustion efficiency. Adopting a dual-jet injection method can change the flow field structure, which has an impact on the form of oil and gas mixing, and significantly increase the mixing and combustion efficiency. When the diameter ratio of the two jet orifices is 0.75∶0.25, the ratio of axial distances is 2.5∶1, the injection phase difference is 0.8, the cycle-averaged combustion efficiency reaches 98%.
- pulse thermal jet /
- non-premixed gases /
- subsonic /
- mixing enhancement /
- combustion enhancement

HTML

图 1 脉冲热射流强化混合燃烧模型结构示意图

Figure 1. Schematic diagram of the structure of the pulsed heat jet enhanced hybrid combustion model

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图 2 射流参数在一个周期内的变化曲线

Figure 2. Variation curve of jet parameters within one cycle

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图 3 Case 1在不同网格数量时流场截面压力变化曲线

Figure 3. Curve of pressure variation across flow field section in Case 1 for different grid counts

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图 4 Case 1流场在不同时刻的马赫数分布云图及流线图

Figure 4. Mach number distribution contour and streamlines plot for Case 1 flow field at different time instances

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图 5 不同频率ƒ_j时射流穿透深度变化曲线

Figure 5. Curve of jet penetration depth variation at different frequencies

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图 6 Case 1瞬时和平均射流穿透深度曲线

Figure 6. Curve of instantaneous and average jet penetration depth for Case 1

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图 7 不同频率ƒ_j时混合效率变化曲线

Figure 7. Curve of variation in mixing efficiency at different frequencies

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图 8 不同频率ƒ_j时主流流量变化曲线

Figure 8. Curve of variation in mainstream flow rate at different frequencies

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图 9 不同射流角度θ_j时射流穿透深度变化曲线

Figure 9. Curve of variation in jet penetration depth at different jet angles

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图 10 不同射流角度θ_j时混合效率变化曲线

Figure 10. Curve of variation in mixing efficiency at different jet angles

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图 11 不同射流角度θ_j时主流流量变化曲线

Figure 11. Curve of variation in mainstream flow rate at different jet angles

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图 12 Case 6和Case 7工况x=0.09 m截面在一个周期内的瞬时燃烧效率变化曲线

Figure 12. Transient combustion efficiency variation curve for Case 6 and Case 7 conditions at x=0.09 m section over one cycle

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图 13 Case 7工况截面周期平均燃烧效率变化曲线

Figure 13. Cycle-averaged combustion efficiency variation curve for Case 7 condition at section

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图 14 双孔喷射时流场内不同时刻的C₃H₈质量分数分布

Figure 14. Mass fraction distribution of C₃H₈ at different instants in the flow field during dual-jet injection

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图 15 双孔喷射时流场内不同时刻的温度分布

Figure 15. Temperature distribution in the flow field at different instants during dual-jet injection

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图 16 不同射流孔位置时周期平均燃烧效率变化曲线

Figure 16. Cycle-averaged combustion efficiency variation curve at different jet orifice positions

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图 17 不同射流分配方式时周期平均燃烧效率变化曲线

Figure 17. Cycle-averaged combustion efficiency variation curve with different jet distribution methods

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表 1 主流入口参数

Table 1. Mainstream inlet parameters

p_∞/Pa	T_∞/K	u_∞/（m/s）	h₁/m
303975	400～800	100	0.0005～0.002

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表 2 射流入口参数

Table 2. Jet inlet parameters

p_j/MPa		T_j/K		u_j/（m/s）		u_c/ （m/s）	d/m
A	C	A	C	A	C	u_c/ （m/s）	d/m
1.6	0.4	2200	800	700	500	2 000	0.005

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表 3 不同工况射流参数统计表

Table 3. Jet parameter statistics table for different operating conditions

算例	ƒ_j/kHz	θ_j/（°）	T_∞/K	h₁/m	喷孔数	是否点火
Case 1	10	90	400	0.002	单孔	否
Case 2	20	90	400	0.002	单孔	否
Case 3	50	90	400	0.002	单孔	否
Case 4	10	60	400	0.002	单孔	否
Case 5	10	30	400	0.002	单孔	否
Case 6	20	60	400	0.002	单孔	是
Case 7	20	60	800	0.0005	单孔	是
Case 8+	20	60/90	800	0.0005	双孔	是

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