时变来流条件下横向射流燃油破碎和雾化特性数值研究

张权; 刘玉英; 刘坤霖; 高昭; 谢奕

doi:10.13224/j.cnki.jasp.20220608

时变来流条件下横向射流燃油破碎和雾化特性数值研究

doi: 10.13224/j.cnki.jasp.20220608

北京航空航天大学能源与动力工程学院，北京 100191

基金项目: 国家科技重大专项（2017-Ⅲ-0008-0034）

详细信息

作者简介:
张权（1996-），男，博士生，主要从事航空发动机雾化研究。E-mail：19800363193@163.com

通讯作者:
刘玉英（1974-），女，教授，博士，主要从事发动机燃烧研究。E-mail：yyliu@buaa.edu.cn

中图分类号: V231.23
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- 被引次数: 0
出版历程
- 收稿日期: 2022-08-22
- 网络出版日期: 2024-02-29

Numerical study on the breakup and atomization characteristics of crossflow under time-varying flow conditions

School of Energy and Power Engineering，Beihang University，Beijing 100191，China

摘要

摘要:
针对涡轮基组合循环发动机加力/冲压燃烧室模态转化过程中进口气流随时间剧烈变化的问题，以横向射流为研究对象，在来流温度300～800 K、来流速度100～164 m/s和来流加速度20～100 m/s²条件下，采用雷诺平均/离散相模型相结合的方法探讨了来流加速度对横向射流外轨迹以及索太尔平均直径（SMD）分布的影响，采用大涡模拟/流体体积法相结合的方法探讨了来流加速度对横向射流燃油雾化过程的影响。结果表明：来流加速度对横向射流外轨迹和下游SMD分布几乎没有影响；来流加速度可能引起射流液柱破碎点延后、反向对转涡沿喷射方向分布变宽且沿展向在边缘处强度减弱，但影响并不显著；时变来流对于燃油破碎及雾化特性无明显影响。
- 时变来流 /
- 流体体积（VOF）模型 /
- 液雾分布轨迹 /
- 索太尔平均直径（SMD）分布 /
- 破碎点
Abstract:
In view of the problem that the inlet flow changes dramatically with time during the modal transformation of afterburner/ramjet of turbo-based combined cycle engine, the transverse jet was taken as the research object. Under the conditions of inlet temperature of 300—800 K, inlet velocity of 100—164 m/s and inlet acceleration of 20—100 m/s², the Reynolds mean/discrete phase model was used to discuss the influence of the inlet acceleration on the lateral jet trajectory and Sauter mean diameter (SMD) distribution. The large eddy simulation/fluid volume method was used to discuss the influence of the inlet acceleration on the lateral jet fuel atomization process. The results showed that the inflow acceleration had little effect on the lateral jet trajectory and downstream SMD distribution. The acceleration of the inlet flow may cause the delayed and reverse vortex to be more widely distributed along the jet direction, but the intensity weakened at the edge along the spanwise direction. But the effect was not significant; the time-varying incoming flow had no obvious effect on the fuel crushing and atomization characteristics.
- time-varying flow /
- volume of fluid (VOF) model /
- trajectory of the spray distribution /
- distribution of Sauter mean diameter (SMD) /
- breakup point

HTML

图 1 计算区域示意图

Figure 1. Diagram of calculated area

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图 2 网格无关性验证

Figure 2. Verification of mesh independence

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图 3 常温下计算的射流轨迹对比图（T=300 K）

Figure 3. Comparison diagram of jet trajectory calculated at room temperature （T=300 K）

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图 4 加速度大小对射流轨迹的影响

Figure 4. Effect of acceleration size on jet trajectory

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图 5 不同加速度时液雾SMD分布直方图（Case A）

Figure 5. Histogram of spray SMD at different accelerations （Case A）

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图 6 加速度大小对SMD的影响

Figure 6. Effect of acceleration on SMD

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图 7 燃油等值面图（y-z向, φ_ISO=10%）

Figure 7. Image of fuel iso-surface （y-z direction , φ_ISO=10%）

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图 8 燃油等值面图（x-z向, φ_ISO=10%）

Figure 8. Image of fuel iso-surface （x-z direction, φ_ISO=10%）

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图 9 沿喷射方向的液柱变形情况分析（x-y向）

Figure 9. Analysis of deformation of liquid column with different sections （x-y direction）

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图 10 x-z平面涡量切片图

Figure 10. Vortex volume of the x-z plane

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图 11 y=4 mm截面上a=0 m/s²与a=100 m/s²工况下的涡量图

Figure 11. Vorticity graphs of a=0 m/s² and a=100 m/s² on the section y=4 mm

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表 1 模拟工况表

Table 1. Simulation case table

工况	来流温度T/K	来流加速度a/（m/s²）	目标来流速度V_air,t/（m/s）	燃油速度U_j/（m/s）	目标液气动量比q_t
Case A0～A3	300	0，20，50，100	100	20	27
Case B0～B3	500	0，20，50，100	128.77	20	27
Case C0～C3	700	0，20，50，100	153.45	20	27
Case D0～D3	800	0，20，50，100	163.58	20	27
Case E0	300	0	120	20	18
Case F0	300	0	140	20	14

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