离心喷嘴液膜不稳定特性试验

宋智涌; 王旭怀; 刘勇; 张祥; 高天华; 葛鑫坤

doi:10.13224/j.cnki.jasp.20230689

离心喷嘴液膜不稳定特性试验

doi: 10.13224/j.cnki.jasp.20230689

宋智涌^1,,
王旭怀²,
刘勇^1,*, ,,
张祥¹,
高天华¹,
葛鑫坤¹

1.
南京航空航天大学能源与动力学院，南京 210016
2.
中国航天科技集团有限公司航天推进技术研究院西安航天动力研究所，西安 710100

基金项目: 航空发动机及燃气轮机重大专项基础研究项目（J2022-Ⅲ-0007-0016）

详细信息

作者简介:
宋智涌（2000-），男，硕士生，主要从事燃烧不稳定研究。E-mail：sz_song@nuaa.edu.cn

通讯作者:
刘勇（1971-），男，副教授，博士，主要从事燃烧不稳定研究。E-mail：njfuzlzc@126.com

中图分类号: V231.2
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- 被引次数: 0
出版历程
- 收稿日期: 2023-11-02
- 网络出版日期: 2024-08-01

Experiment on instable characteristics of liquid sheet in swirl atomizer

1.
College of Energy and Power Engineering，Nanjing University of Aeronautics and Astronautics，Nanjing 210016，China
2.
Xi’an Aerospace Propulsion Institute，Academy of Aerospace Propulsion Technology，China Aerospace Science and Technology Corporation，Xi’an 710100，China

摘要

摘要:
为了获得旋流液膜破碎过程中表面波不稳定增长特性及其影响规律，对不同几何结构收口型离心喷嘴进行了试验研究。基于高速图像，提取了液膜发展过程中的表面波幅值增长率，并总结了压降对其影响规律。研究结果表明：主导液膜表面波的幅值沿液膜表面流向呈指数增长，且表面波幅值的增长率表现出非线性特征；将液膜的发展划分为快速增长区、慢速增长区和破碎区，建立了不同区域波动幅值随行进距离变化的函数，提取了不同发展区域对应的主导波动增长率，体现了液膜的非线性不稳定增长规律。同时对液膜分区临界点进行分析，建立了破碎长度和压降的函数关系，发现破碎长度随着压降增加呈现指数递减规律，且通过函数关系可预测喷嘴液膜的极限破碎长度，该长度随着喷嘴出口直径的增加而增大。
- 离心喷嘴 /
- 液膜 /
- 波动幅值 /
- 破碎长度 /
- 指数变化
Abstract:
In order to obtain the unstable growth characteristics and influence laws of surface waves during the process of swirling liquid sheet fragmentation, experimental studies on different geometric structures of closed swirl atomizers were conducted. Based on high-speed images, the growth rate of surface wave amplitude during the development of liquid sheet was extracted, and the influence of pressure drop was summarized. The research results indicated that the amplitude of the dominant liquid sheet surface wave increased exponentially along the flow direction of the liquid sheet surface, and the growth rate of the surface wave amplitude value exhibited nonlinear characteristics; the development of liquid sheet was divided into fast growth zone, slow growth zone, and fragmentation zone. A function was established for the variation of fluctuation amplitude with travel distance in different regions, and the dominant fluctuation growth rate corresponding to different development regions was extracted, reflecting the nonlinear and unstable growth laws of the liquid sheet. At the same time, the position of the turning point of the function was analyzed, and a functional relationship between the breakup length and pressure drop was established. It was found that the breakup length showed an exponential decline trend with the increase of pressure drop, and the ultimate breakup length of the atomizer liquid sheet can be predicted through the functional relationship. The ultimate breakup length increased with the increase of the atomizer outlet diameter.
- swirl atomizer /
- liquid sheet /
- fluctuation amplitude /
- breakup length /
- exponential change

HTML

图 1 试验系统示意图

Figure 1. Schematic diagram of experimental system

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图 2 喷嘴结构示意图

Figure 2. Schematic diagram of atomizer structure

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图 3 图像处理示意图

Figure 3. Image processing diagram

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图 4 No.2喷嘴表面波频率提取示意图（Δp=0.4 MPa）

Figure 4. Schematic diagram of No.2 atomizer surface wave frequency extraction （Δp=0.4 MPa）

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图 5 时序图像处理过程

Figure 5. Temporal image processing process

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图 6 No.2喷嘴参数随压降变化

Figure 6. No.2 atomizer parameters changing with different pressures

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图 7 液膜发展示意图

Figure 7. Schematic diagram of liquid sheet development

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图 8 波动幅值随液膜行进距离变化

Figure 8. Fluctuation amplitude and variation of liquid sheet motion distance

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图 9 不同压降下的幅值增长率拟合

Figure 9. Fitting of amplitude growth rate under different pressure drops

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图 10 临界点位置随压降的变化

Figure 10. Position of the cut-off point changing with pressure drop

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表 1 不同压降下液膜扰动幅值相关拟合参数

Table 1. Fitting parameters related to the amplitude of liquid sheet disturbance under different pressure drops

工况	（$ {\omega }_{1}/U $）/10⁻⁴ m⁻¹	$ {\mathrm{ln}}\;{\eta }_{0} $	（$ {\omega }_{2}/U $）/10⁻⁵ m⁻¹	$ {\mathrm{ln}}\;{\eta }_{{\mathrm{c}}} $
1	1.62	−2.439	7.13	−1.156
2	1.68	−2.493	7.11	−1.230
3	1.85	−2.492	7.25	−1.242
4	1.91	−2.515	7.65	−1.418
5	2.02	−2.550	6.95	−1.396
6	1.92	−2.533	7.04	−1.431

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