中心分级燃烧室慢车工况油雾场特性

段争梁; 桂韬; 房人麟; 刘云鹏; 颜应文

doi:10.13224/j.cnki.jasp.20210199

中心分级燃烧室慢车工况油雾场特性

doi: 10.13224/j.cnki.jasp.20210199

段争梁^{1, 2},
桂韬³,
房人麟^{2, 3},
刘云鹏^2,*, ,,
颜应文²

1.
中国航发控制系统研究所，江苏无锡 214063
2.
南京航空航天大学能源与动力学院，南京 210016
3.
中国航发四川燃气涡轮研究院，成都 610500

基金项目: 国家科技重大专项（J2019-Ⅲ-0004-0047)

详细信息

作者简介:
段争梁（1997-），男，助理工程师，硕士，主要从事航空发动机燃烧室燃烧研究

通讯作者:
刘云鹏（1992-），男，讲师，博士，主要从事航空发动机燃烧室燃烧相关技术研究。E-mail：ypliu@nuaa.edu.cn

中图分类号: V231.2
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出版历程
- 收稿日期: 2021-04-27
- 网络出版日期: 2022-12-30

Characteristics of fuel spray field in central staged combustor at idle condition

DUAN Zhengliang^{1, 2},
GUI Tao³,
FANG Renlin^{2, 3},
LIU Yunpeng^{2,*
, ,},
YAN Yingwen²

1.
Aero Engine Control System Institute， Aero Engine Corporation of China，Wuxi Jiangsu 214063，China
2.
College of Energy and Power Engineering， Nanjing University of Aeronautics and Astronautics，Nanjing 210016，China
3.
Sichuan Gas Turbine Establishment，Aero Engine Corporation of China，Chengdu 610500，China

摘要

摘要:
为获得中心分级燃烧室慢车工况下主副级油雾场特性，采用粒子图像测速仪（PIV）对单管燃烧室不同头部方案和不同喷嘴燃油比例的油雾场进行试验测量，开发了油雾场图像后处理软件，对油雾场图像进行后处理，获得了中心分级燃烧室油雾场空间分布。慢车工况下油雾场试验结果表明：大粒径油珠在燃烧室富油头部区域呈锥形分布，同时索太尔平均直径（SMD）沿径向呈V型分布，即中间小、两侧大。燃烧室头部折流板扩张角的减小，使得燃烧室富油头部区域油珠数目集中、同时平均SMD较大。保持来流条件和油气比一定时，改变燃油比例对燃烧室雾化效果影响不大。油雾场中油珠数目最多的粒径是25 μm，而体积占比最大的粒径范围是30～50 μm。
- 中心分级燃烧室 /
- 油雾场 /
- 索太尔平均直径（SMD） /
- 慢车工况 /
- 燃油比例
Abstract:
In order to obtain the characteristics of spray field of main stage nozzle and pilot nozzle of central staged combustor at idle condition, the particle image velocimetry (PIV) was used to measure the spray field of single-tube combustion chamber with different head schemes and different nozzle fuel ratios. And the post-processing software of spray field image was developed, the spatial distribution of the spray field was obtained by extracting oil droplets on raw pictures in the central graded combustion chamber. The research of spray field under idle condition indicated that: large-size droplets were distributed in a conical shape in the fuel-rich head area of the combustion chamber, while the Sauter mean diameter (SMD) was distributed in a V-shaped radial direction, namely, small in the middle and large on both sides. The reduction of the expansion angle of the baffle made the number of droplets concentrated in the fuel-rich head area of the combustion chamber and the average SMD was larger. When the incoming flow conditions and the fuel-air ratio were kept constant, changing the fuel ratio had little effect on the atomization effect. The particle size with the largest number of droplets in the spray field under idle conditions was 25 μm, and the particle size range with the largest volume ratio was 30−50 μm.
- central staged combustor /
- fuel spray field /
- Sauter mean diameter (SMD) /
- idle condition /
- fuel allocation

HTML

图 1 中心分级燃烧室结构示意图

Figure 1. Schematic of geometric structure of the center-staged combustor

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图 2 燃烧室头部方案组合结构示意图

Figure 2. Schematic of combustor head component combination

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图 3 油雾特性试验系统示意图

Figure 3. Diagram of experiment system about characteristics of spray

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图 4 油雾场拍摄方法示意图

Figure 4. Schematic of photograph method for fuel spray field

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图 5 油珠提取示意图

Figure 5. Schematic of spray droplets

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图 6 拍摄结果与燃烧室位置关系

Figure 6. Relative position of between observed results with combustor

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图 7 油雾场图像处理方法验证

Figure 7. Verification of image processing method for fuel field

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图 8 值班级喷嘴燃油占比100%时方案A和方案B的d₃₂分布云图

Figure 8. Distribution contour of d₃₂ for Plan A and Plan B at pilot nozzle fuel ratio 100%

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图 9 值班级喷嘴燃油占比100%时方案A和方案B的油珠数目分布云图

Figure 9. Distribution contour of droplets number of Plan A and Plan B at pilot nozzle fuel ratio 100%

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图 10 值班级喷嘴燃油占比60%时方案 A和方案 B的d₃₂分布云图

Figure 10. Distribution contour of d₃₂ for Plan A and Plan B at pilot nozzle fuel ratio 60%

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图 11 方案 B不同燃油比例全场d₃₂分布

Figure 11. Distribution of d₃₂ for different fuel ratios about Plan B

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图 12 方案 C不同燃油比例全场d₃₂和油珠数目分布

Figure 12. Distribution of d₃₂ and droplets number for different fuel ratios about Plan C

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图 13 方案 C慢车工况下流线分布

Figure 13. Distribution of streamlines for Plan C at idle condition

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图 14 不同方案下富油头部区和全场油珠数目对比示意图

Figure 14. Schematic of comparison of number of droplets between Rich head filed with whole area for different plans

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图 15 富油头部区域与全场区域平均d₃₂差异水平示意图

Figure 15. Schematic of the average d₃₂ difference between the fuel-rich head area and the whole area

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图 16 不同工况下油珠数量及体积随粒径的分布规律

Figure 16. Distribution of fuel droplets number and volume with particle size for different conditions

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表 1 燃烧室进口条件

Table 1. Operation conditions for combustor inlet

燃烧室进口压力p₃/kPa	燃烧室进口温度T₃/K	进口空气流量${\dot m}_3 $/（g/s）	燃烧室油气比（FAR）
340	450	620	0.014

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表 2 试验工况参数表

Table 2. Operating parameters of experiment

方案	油气比	值班级喷嘴燃油占比/%	主燃级喷嘴燃油占比/%
方案A	0.014	100	0
方案A	0.014	60	40
方案B	0.014	100	0
	0.014	80	20
	0.014	60	40
	0.014	40	60
	0.014	20	80
方案 C	0.014	100	0
	0.014	80	20
	0.014	60	40
	0.014	40	60
	0.014	20	80

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表 3 方案 A和方案 B的全场平均d₃₂

Table 3. Results of Average d₃₂ for Plan A and Plan B

工况	头部方案	全场平均d₃₂/μm
值班级喷嘴燃油占比100%	方案B	59.70
值班级喷嘴燃油占比100%	方案A	52.32
值班级喷嘴燃油占比60%	方案B	56.57
值班级喷嘴燃油占比60%	方案A	56.24

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表 4 方案 B全场平均d₃₂

Table 4. Average d₃₂of full zones for Plan B

值班级燃油比例/%	全场平均d₃₂/μm
80	58.3
60	56.2
40	54.4
20	56.7

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表 5 方案 C全场平均d₃₂

Table 5. Average d₃₂ of full zones for Plan C

值班级燃油比例/%	全场平均d₃₂/μm
100	53.9
80	54.8
60	53.2
40	55.95
20	55.2

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