凹腔稳燃超声速燃烧火焰闪回不稳定性的数值研究

肖烨炘; 金台

doi:10.21656/1000-0887.440103

凹腔稳燃超声速燃烧火焰闪回不稳定性的数值研究

doi: 10.21656/1000-0887.440103

肖烨炘,
金台^,

浙江大学航空航天学院，杭州 310027

基金项目:

国家自然科学基金项目 52076194

详细信息

作者简介:
肖烨炘(1999—)，男，博士生(E-mail: xiao_yexin@zju.edu.cn)

通讯作者:
金台(1988—)，男，副教授(通讯作者. E-mail: jintai@zju.edu.cn)

中图分类号: O354.4
计量
- 文章访问数: 492
- HTML全文浏览量: 180
- PDF下载量: 60
- 被引次数: 0
出版历程
- 收稿日期: 2023-04-12
- 修回日期: 2023-07-21
- 刊出日期: 2023-09-01

Numerical Analysis of Flame Flashback and Instability in Cavity-Stabilized Supersonic Combustion

XIAO Yexin,
JIN Tai^,

School of Aeronautics and Astronautics, Zhejiang University, Hangzhou 310027, P.R.China

摘要

摘要: 针对等直截面超燃冲压发动机燃烧室中火焰闪回低频燃烧振荡现象，采用延迟分离涡模拟(DDES)的混合RANS/LES方法结合PaSR湍流燃烧模型进行了三维模拟研究.计算得到了完整的燃烧振荡周期，与实验中的低频燃烧振荡现象较为一致.低频燃烧振荡周期可分为凹腔火焰稳定、火焰回传、火焰吹熄3个阶段.通过分析低频燃烧振荡周期中不同阶段的燃烧流动状态，给出了可能的低频燃烧振荡的形成机制.研究结果表明，在整个低频燃烧振荡周期中燃烧室内没有发生热壅塞，燃烧室提供的背压和燃烧释热是燃烧室内形成低频燃烧振荡的关键.
- 火焰闪回 /
- 超声速低频燃烧振荡 /
- 燃烧流动 /
- 热壅塞
Abstract: Aimed at the phenomenon of flame flashback and low-frequency combustion oscillation in the scramjet combustor with equal straight cross sections, 3D simulations were conducted, with the hybrid RANS/LES method (delayed detached-eddy simulation, DDES) for turbulence modeling and the partially stirred reactor (PaSR) for turbulence-reaction interactions. The obtained entire combustion oscillation period is consistent with the low-frequency combustion oscillation phenomenon observed in the experiment. The low-frequency combustion oscillation period can be divided into 3 stages: the cavity-holding flame, the flame flashback, and the flame blowout. By analysis of the reacting flow field in different stages of the low-frequency combustion oscillation cycle, the possible formation mechanism of low-frequency combustion oscillations was summarized. The results show that, there is no choking in the combustion chamber during the whole low-frequency combustion oscillation period. The pressure rise induced by shock interaction and the heat released by combustion are the key factors for the formation of low-frequency combustion oscillations in the combustion chamber.
- flame flashback /
- low-frequency combustion oscillation /
- combustion flow field /
- choking

HTML全文

图 1 模型燃烧室结构示意图(单位: mm)

Figure 1. Schematic of the model combustion chamber(unit: mm)

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图 2 冷态流场上壁面静压分布

Figure 2. Static pressure distribution on the upper wall surface in the cold flow field

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图 3 中间截面温度云图随时间变化(Δt=0.2 ms)

注为了解释图中的颜色，读者可以参考本文的电子网页版本，后同.

Figure 3. Contours of temperature in the mid plane at various moments (Δt=0.2 ms)

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图 4 三维火焰面结构，温度着色的当量混合分数等值面

Figure 4. Iso-surfaces of the stoichiometric mixture colored by temperature

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图 5 燃烧室内密度纹影、Ma数、压力、温度云图(t=t₀, t₀+0.4 ms)

Figure 5. Contours of $|\nabla \rho| $, Ma, pressure, temperature in the combustion chamber (t=t₀, t₀+0.4 ms)

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图 6 燃烧室内密度纹影、Ma数、压力、温度云图(t=t₀+1.6 ms, t₀+2.0 ms)

Figure 6. Contours of $|\nabla \rho| $, Ma, pressure, temperature in the combustion chamber (t=t₀+1.6 ms, t₀+2.0 ms)

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图 7 燃烧室内火焰索引因子对比图

Figure 7. Comparison diagram of flame index in the combustion chamber

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图 8 燃烧室内测点示意图

Figure 8. Schematic diagram of the probe in the combustion chamber

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图 9 测点压力波动测量结果

Figure 9. Probe pressure fluctuation measurement results

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图 10 燃烧室内激波示意图

Figure 10. Schematic diagram of the shock wave in the combustion chamber

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表 1 隔离段入口及燃料喷口参数

Table 1. Isolator inlet and jet parameters

	pressure P/kPa	velocity v/(m/s)	temperature T/K	Y_O₂	Y_H₂0	Y_CO₂	Y_N₂	Y_C₂H₄
inlet	89.12	1 323	719.3	0.233 8	0.101 6	0.062 2	0.602 4	0
jet	847.28	315	265.2	0	0	0	0	1

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