喷嘴内螺纹结构对射流破裂长度的影响

刘禹; 施浙杭; 郝叶峻; 王子钰; 赵辉; 刘海峰

doi:10.14135/j.cnki.1006-3080.20201228003

喷嘴内螺纹结构对射流破裂长度的影响

doi: 10.14135/j.cnki.1006-3080.20201228003

1.
华东理工大学上海煤气化工程技术研究中心，上海 200237
2.
上海空间推进研究所，上海 201112

基金项目: 国家重点研发计划(2018YFC0808500)；国家自然科学基金(21878095)

详细信息

作者简介:
刘禹：刘　禹(1996-)，男，江苏淮安人，硕士生，主要从事多相流气液雾化的研究。E-mail：y30180833@mail.ecust.edu.cn

通讯作者:
赵　辉(1984—)，男，博士，副教授，E-mail: zhaohui@ecust.edu.cn

中图分类号: O359⁺.1
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出版历程
- 收稿日期: 2020-12-28
- 网络出版日期: 2021-04-07

Effects of Nozzle Screw Structure on Breakup Length of Jet

1.
Shanghai Engineering Research Center of Coal Gasification, East China University of Science and Technology, Shanghai 200237, China
2.
Shanghai Institute of Space Propulsion, Shanghai 201112, China

摘要

摘要: 使用高速相机研究了喷嘴螺纹结构对液体射流破裂的影响。采用5种不同直径(4.00、4.80、7.50、8.75、10.80 mm)的喷嘴，螺纹深度范围0.40~1.25 mm，液体射流雷诺数范围500~22 600。实验结果表明：当雷诺数小于1 600时，液体射流破裂长度随着雷诺数的增加而增加，喷嘴螺纹结构对液体射流破裂长度的影响较小；随着雷诺数的增加，液体射流破裂长度先增加后减小，喷嘴螺纹结构影响显著，其液体射流破裂长度小于光滑喷嘴；当雷诺数大于7 000时，液体射流破裂长度随着雷诺数的增加而增加，喷嘴螺纹结构继续促进液体射流破裂长度的减小；同时，实验结果还表明喷嘴螺纹结构对小直径喷嘴（直径小于5 mm）的影响更显著。最后，以量纲为一螺纹深度、雷诺数和韦伯数等参数建立了液体射流破裂长度预测关系式。
- 破裂长度 /
- 螺纹结构 /
- 螺纹深度 /
- 射流 /
- 喷嘴
Abstract: The effects of nozzle screw structure on liquid jet breakup were investigated with a high-speed camera. Five nozzles with different diameters (4.00, 4.80, 7.50, 8.75 and 10.80 mm) were used in the experiment. The thread depth range was 0.40—1.25 mm, the liquid jet Reynolds number was within the scope of 500—22 600, and the Weber number was within the scope of 0.000 3~1.2. The experimental results show the screw structure has a strong disturbance to the jet and promotes the breakup of jet. By comparing the jet breakup length under different exprerimental conditions, it can be obtained that increasing Reynolds number leads to the decrease of breakup length when the Reynolds number is less than 1 600. The structure of nozzle screw has little influence on the fracture length of liquid jet. The breakup length of liquid jet increases first and then decreases with the Reynolds numbers raised. In this condition, the influence of screw structure of nozzle is significant, the breakup length is shorter than the smooth one. When the Reynolds number is in the 7 000 range above, the breakup length of liquid jet rises with the increase of Reynolds number and the screw structure of nozzle continues to promote the decrease of the fracture length of liquid jet. The experimental results show that the influence of nozzle screw structure on small diameter nozzle (diameter less than 5 mm) is more significant than the larger nozzle. By using dimensionless thread depth, Reynolds number and Weber number, the relationship for predicting the rupture length of liquid jet was established.
- breakup length /
- screw structure /
- thread depth /
- liquid jet /
- nozzle

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图 1 (a) 实验装置和(b) 螺纹结构示意图

1—Liquid storage; 2—Pump; 3—Valve; 4—Tube rotameter; 5—Nozzle; 6—High speed camera; 7—Computer;

Figure 1. Schematic diagram of experimental setup (a) and nozzle structure (b)

下载: 全尺寸图片幻灯片

图 3 直径脉动与采样时间关系图（u_l=2.31 m/s，Re=22 600)

Figure 3. Relationship of diameter pulsation and sampling time(u_l=2.31 m/s, Re=22600)

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图 4 喷嘴液体射流直径脉动能谱图（u_l=2.31 m/s， Re=22 600)

Figure 4. Energy spectra of nozzle liquid jet diameter pulsation (u_l=2.31 m/s, Re=22 600 )

下载: 全尺寸图片幻灯片

图 5 液体射流破裂长度示意图

Figure 5. Schematic diagram of breakup length of liquid jet

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图 6 不同喷嘴射流破裂长度随Re变化趋势图(拟合曲线来自公式8、10、11)

Figure 6. Trend diagram of different nozzle jet breakup length changing with Re (fitting curve from formula 8, 10, 11)

下载: 全尺寸图片幻灯片

图 7 量纲为一射流破裂长度分区

Figure 7. Dimensionless jet fracture length partition

下载: 全尺寸图片幻灯片

图 8 螺纹喷嘴9不同Re时工况射流对比图

Figure 8. Screw nozzle jet images with different Re

下载: 全尺寸图片幻灯片

表 1 实验喷嘴尺寸

Table 1. Size of experimental nozzle

No. D/mm a /mm X

1 4.00 0 0
2 4.00 0.40 0.10
3 4.80 0 0
4 4.80 0.45 0.09
5 7.50 0 0
6 7.50 0.10 0.01
7 7.50 0.75 0.10
8 8.75 0 0
9 8.75 1.00 0.11
10 10.80 0 0
11 10.80 1.25 0.12

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