喷射结构对超临界RP-3航空煤油射流自激振荡特性的影响

史鹏宇; 张启斌; 王之声; 任利时; 于倩倩; 范玮

doi:10.13224/j.cnki.jasp.20230359

喷射结构对超临界RP-3航空煤油射流自激振荡特性的影响

doi: 10.13224/j.cnki.jasp.20230359

史鹏宇^1,,
张启斌^1,*, ,,
王之声¹,
任利时¹,
于倩倩¹,
范玮^{1, 2}

1.
西北工业大学动力与能源学院，西安 710072
2.
西北工业大学陕西省航空动力系统热科学重点实验室，西安 710129

基金项目: 国家科技重大专项（2017-Ⅲ-0005-0030）

详细信息

作者简介:
史鹏宇（1996-），男，博士生，主要从航空发动机燃烧及燃烧室设计研究。E-mail：shidande163@163.com

通讯作者:
张启斌（1990-），男，副教授，博士，主要从事先进推进技术研究。E-mail：zhangqibin@nwpu.edu.cn

中图分类号: V231.3
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出版历程
- 收稿日期: 2023-05-30
- 网络出版日期: 2024-08-07

Effect of injection structure on the self-pulsation characteristics of supercritical RP-3 aviation kerosene jet

SHI Pengyu^1
,,
ZHANG Qibin^{1,*
, ,},
WANG Zhisheng¹,
REN Lishi¹,
YU Qianqian¹,
FAN Wei^{1, 2}

1.
School of Power and Energy，Northwestern Polytechnical University，Xi’an 710072，China
2.
Shaanxi Key Laboratory of Thermal Sciences in Aero-engine System，Northwestern Polytechnical University，Xi’an 710129，China

摘要

摘要:
燃料喷射中的自激振荡是诱发燃烧不稳定的重要原因，超临界态燃料“类气体”的性质使其自激振荡对油气混合及燃烧有更显著的影响。为探明超临界煤油自激振荡产生的原因并寻找抑制方法，对超临界煤油射流在旋流流场中的自激振荡特性进行了研究。利用本征正交分解，采用高速纹影技术对不同伴流条件、缩进比和气-液面积比下的超临界煤油喷射过程进行了研究。结果表明：自激振荡的振荡模式为轴向振荡和径向振荡，伴流气体会影响自激振荡区域。气-液面积比为674时，自激振荡的诱因为油-伴流气相互作用，随缩进比减小，自激振荡减弱；气-液面积比为416及178时，自激振荡的诱因为伴流气-环境相互作用，且随缩进比减小，自激振荡增强。
- 超临界态燃料 /
- 喷射 /
- 本征正交分解（POD） /
- 自激振荡 /
- 纹影技术
Abstract:
Self-pulsation in fuel injection is an important cause of combustion instability, and the "gas-like" nature of supercritical fuel makes its self-pulsation yield a more significant effect on oil-gas mixing and combustion. The self-pulsation of supercritical kerosene jets in the rotating flow field was investigated to find out the causes of the self-pulsation and the ways to suppress it. The supercritical kerosene injection processes under different companion flow conditions, recess ratios, and gas-liquid area ratios were investigated by using a high-speed schlieren technique using the proper orthogonal decomposition. The results showed that the oscillation modes of self-pulsation were represented by axial and radial oscillations, and the accompanying gas affected the self-pulsation region. When the gas-liquid area ratio was 674, the cause of self-pulsation was oil-associated gas interaction, and the self-pulsation decreased with the decrease of the recess ratio; when the gas-liquid area ratio was 416 and 178, the cause of self-pulsation was associated gas-environment interaction, and the self-pulsation increased with the decrease of the recess ratio.
- supercritical fuels /
- injection /
- proper orthogonal decomposition (POD) /
- self-pulsation /
- schlieren techniques

HTML

图 1 纹影光路示意图

1 氙灯光源；2 透镜；3 小孔；4 1 号抛物面反射镜；5 测试区域；6 2 号抛物面反射镜；7 刀口；8 高速相机。

Figure 1. Schlieren light path diagram

下载: 全尺寸图片幻灯片

图 2 超临界喷射系统示意图

1 高压气源；2 减压阀；3 手阀；4 压力表；5 预热油管；6 过滤器；7 截止阀；8 热电偶（PT100）；9 超临界煤油加热器；10 喷嘴及旋流器。

Figure 2. Schematic diagram of supercritical injection system

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图 3 喷射单元结构示意图

Figure 3. Diagram of injection unit structure

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图 4 各模态能量占比

Figure 4. Energy proportion of each mode

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图 5 射流密度梯度POD前6阶脉动模态空间分布

Figure 5. Spatial distribution of pulsation modes in the first 6 orders of the jet density gradient POD

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图 6 射流纹影图像及时均二值化图像

Figure 6. Schlieren image and time-averaged binarized image of jet

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图 7 不同喷射温度下伴流气体对射流自激振荡特性的影响

Figure 7. Effect of accompanying gas on the self-pulsation characteristics of the jet at different injection temperatures

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图 8 不同喷射压力下伴流气体对射流自激振荡特性的影响

Figure 8. Effect of accompanying gas on the self-pulsation characteristics of the jet at different injection pressures

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图 9 r_AR=674时不同缩进比下射流脉动空间分布

Figure 9. Spatial distribution of jet pulsation at different recess ratios for r_AR=674

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图 10 r_AR=416时不同缩进比下射流脉动空间分布

Figure 10. Spatial distribution of jet pulsation at different recess ratios for r_AR=416

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图 11 r_AR=178时不同缩进比下射流脉动空间分布

Figure 11. Spatial distribution of jet pulsation at different recess ratios for r_AR=178

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图 12 r_RR=8.33时不同面积比下超临界射流冷凝位置

Figure 12. Location of supercritical jet condensation at different area ratios at r_RR=8.33

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图 13 不同AR下超临界射流脉动模态1空间分布

Figure 13. Spatial distribution of supercritical jet pulsation mode 1 at different AR

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表 1 喷射单元关键结构参数

Table 1. Key structural parameters of injection unit

参数数值

D_oil/mm 0.6
r_AR 178，416，674
r_RR 0, 8.33，16.67，25，33.33

下载: 导出CSV

表 2 实验条件

Table 2. Experimental conditions

有无伴流 p_inj/MPa T_inj/K

有 3.0 420，460，480

2.4，3.0，3.6 420

无 3.0 420，460，480

2.4，3.0，3.6 420

下载: 导出CSV

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