离心喷嘴初始雾化性能PDPA及DOH对比试验

王东辉; 黄勇; 汪磊; 吴迎春

doi:10.13224/j.cnki.jasp.20220247

离心喷嘴初始雾化性能PDPA及DOH对比试验

doi: 10.13224/j.cnki.jasp.20220247

王东辉^{1, 2, 3,},
黄勇^{1, 2, 3,*, ,},
汪磊⁴,
吴迎春⁴

1.
北京航空航天大学能源与动力工程学院，北京 100191
2.
北京航空航天大学航空发动机气动热力国家级重点实验室，北京 100191
3.
先进航空发动机协同创新中心，北京 100191
4.
浙江大学清洁能源利用国家重点实验室，杭州 310027

详细信息

作者简介:
王东辉（1995-），男，博士生，主要从事航空发动机喷嘴雾化性能研究

通讯作者:
黄勇（1964-），男，教授、博士生导师，博士，主要从事燃油雾化及燃烧室点火熄火机理研究。E-mail：yhuang@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: 2022-04-25
- 网络出版日期: 2022-09-07

Comparative experiment on initial atomization performance of centrifugal nozzle with PDPA and DOH

WANG Donghui^{1, 2, 3
,},
HUANG Yong^{1, 2, 3,*
, ,},
WANG Lei⁴,
WU Yingchun⁴

1.
School of Energy and Power Engineering，Beihang University，Beijing 100191，China
2.
National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics， Beihang University，Beijing 100191，China
3.
Collaborative Innovation Center for Advanced Aero-Engine，Beijing 100191，China
4.
State Key Laboratory of Clean Energy Utilization，Zhejiang University，Hangzhou 310027，China

摘要

摘要:
为了开展离心喷嘴初始雾化阶段雾化性能研究，结合传统的相位多普勒颗粒分析仪（PDPA）和新兴的数字离轴全息术（DOH）两种测试方法对离心喷嘴雾化性能进行了测试。测试过程中，以航空煤油RP-3为工质，保持燃油压力为0.8 MPa不变，改变燃油温度（240~300 K）。测试结果表明：初始雾化阶段SMD空间分布呈“单峰”分布，且随着轴向距离的增大，SMD的峰值变大，峰值位置向外侧移动；对于初始雾化阶段的同一轴向位置，油温的改变会同时影响液膜破碎长度和液滴破碎过程，使燃油温度对SMD分布无明显的规律性；DOH液滴识别算法会将重叠的液滴识别为液丝或不规则液滴排除在统计范围内，使DOH测得的SMD和液滴尺寸微分分布峰值位置较PDPA偏小；DOH可以直接观察到液膜破碎过程和破碎后的液滴分布情况，有助于对试验结果进行分析。
- 粒径空间分布 /
- 离心喷嘴 /
- 燃油温度 /
- 相位多普勒颗粒分析仪(PDPA) /
- 数字离轴全息术(DOH)
Abstract:
To study the atomization performance of the centrifugal nozzle in the initial atomization stage, a traditional phase Doppler particle analyzer (PDPA) and a digital off-axis holography (DOH) were used. Using aviation kerosene RP-3 as the working fluid and maintaining the fuel pressure at 0.8 MPa, the atomization performance of the centrifugal nozzle at different fuel temperatures (240—300 K) was studied. The experimental results showed that: the spatial distribution of the Sauter mean diameter (SMD) in the initial atomization stage presented a “single peak” distribution, and with the increase of the axial distance, the peak value of the SMD increased, and the peak position of the SMD moved to the outside; for the same axial position of the initial atomization stage, because the change of fuel temperature could affect the length of the liquid film and the process of droplets breaking, the fuel temperature had no obvious regularity to the SMD distribution; the algorithm of droplets identification could identify the overlapping droplets as liquid filaments or irregular droplets. And the algorithm might exclude overlapping droplets from the statistical range, so the SMD and the peak position of the differential distribution of droplets size and number measured by DOH was smaller than that of DOH; DOH can directly observe the breaking process of the liquid film and the distribution of droplets, helping to analyze the experimental results.
- spatial distribution of droplet sizes /
- centrifugal nozzle /
- fuel temperature /
- phase Doppler particle analyzer (PDPA) /
- digital off-axis holography (DOH)

HTML

图 1 试验用离心喷嘴结构和破碎过程示意图

Figure 1. Schematic diagram of the centrifugal nozzle structure and breakup process for the experiments

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图 2 燃油供给与回收系统示意图

Figure 2. Schematic diagram of the fuel supply and recovery system

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图 3 二维PDPA测试系统示意图

Figure 3. Schematic diagram of 2D PDPA measurement system

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图 4 脉冲激光离轴全息测试系统示意图^[22]

Figure 4. Schematic diagram of pulsed laser DOH measurement system^[22]

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图 5 DOH方法中液滴记录、识别和重建过程

Figure 5. Droplet recording, identification and reconstruction process in DOH method

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图 6 离散液滴聚焦曲线

Figure 6. Focusing curves of discrete droplets

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图 7 DOH标定板不同尺寸粒径测量相对误差

Figure 7. Relative error between the measurement of DOH and stand particle of calibration plate with different sizes

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图 8 典型喷雾场内液滴识别情况

Figure 8. Droplet identification in the typical spray field

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图 9 SMD空间分布云图和分布曲线计算方法

Figure 9. SMD spatial distribution cloud atlas and distribution curves calculation method

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图 10 喷嘴下游5～8 mm处的SMD分布云图（T=280 K）

Figure 10. Cloud of SMD distribution at 5～8 mm downstream of the nozzle (T=280 K)

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图 11 喷嘴下游SMD空间分布曲线

Figure 11. SMD spatial distribution curve at downstreamof the nozzle

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图 12 燃油温度为280 K时得到的时间分辨雾化结果

Figure 12. Time-resolved atomization results obtained at fuel temperature of 280 K

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图 13 不同燃油温度下，喷嘴下游7 mm处SMD空间分布曲线

Figure 13. Spatial distribution curves of SMD at 7 mm downstream of the nozzle under different fuel temperatures

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图 14 不同燃油温度下喷嘴下游7 mm处液滴尺寸数量微分分布试验结果和拟合结果对比

Figure 14. Comparison of experimental and fitting results of DDSN at 7 mm downstream under different fuel temperatures

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图 15 典型非球形液滴形状及其等效直径

Figure 15. Shape and equivalent diameter of the typical non-spherical droplet

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