Research on experimental measurement of spray parameters of nozzle by using trajectory imaging method

doi:10.11949/0438-1157.20191454

Abstract

Abstract:

Aiming at the problem of simultaneous measurement of nozzle atomization multi-parameters, a method for measuring nozzle atomization angle, atomization fineness, droplet movement speed and distribution parameters based on image processing is proposed. The measurement system using backlight shadow imaging method, and the process and algorithm based on trajectory imaging method were established. The measurement accuracy of trajectory imaging method was validated by using standard particle measurement. The experimental synchronous measurements of spray parameters of fan-type nozzle with the different apertures on the different atomization pressure were carried out. The results show that, when the atomization pressure remains unchanged, atomization fineness and average velocity of the droplets increase by 26.82% and 10.42%, respectively, and the atomization angle decreases by 16.66% with the aperture of the fan-type nozzle changes from 0.66 mm to 1.10 mm. When the aperture remains unchanged, the atomization angle and the average velocity of the droplets increase by 47.71% and 95.10%, respectively, and the atomization fineness decreases by 44.23% with the atomization pressure increases from 0.1 MPa to 0.4 MPa. It provides an effective tool for the study of atomization droplet characteristics and the evaluation of nozzle performance.

Key words: spray measurement method, trajectory imaging method, atomization angle, atomization fineness, droplet velocity

摘要：

针对喷嘴雾化多参数同步测量问题，提出了基于图像处理的喷嘴雾化角、雾化细度、液滴运动速度及分布参数测量方法，利用背光阴影成像技术搭建了喷嘴雾化参数测量系统，建立了基于轨迹图像法原理的喷嘴雾化参数图像处理流程与算法，利用标准颗粒测量验证了该方法对颗粒粒径测量的精度，并开展了不同孔径与压力下扇形喷嘴雾化参数同步测量实验研究。结果表明：当雾化压力不变，扇形喷嘴孔径从0.66 mm变为1.10 mm时，雾化细度与液滴平均运动速度分别增加26.82%、10.42%，而雾化角随扇形喷嘴孔径增大而减小16.66%；当扇形喷嘴孔径不变，雾化压力从0.1 MPa增加到0.4 MPa时，雾化角与液滴平均运动速度分别增加47.71%、95.10%，而雾化细度随雾化压力增加而减小44.23%。这为雾化液滴特性研究与喷嘴性能评估提供了有效手段。

关键词: 喷雾测量方法, 轨迹图像法, 雾化角, 雾化细度, 液滴速度

CLC Number:

TK 31

Zhixiong SHI, Kewei PAN, Li PING, Bin YANG. Research on experimental measurement of spray parameters of nozzle by using trajectory imaging method[J]. CIESC Journal, 2020, 71(8): 3527-3534.

施智雄, 潘科玮, 平力, 杨斌. 喷嘴雾化参数轨迹图像法测量实验研究[J]. 化工学报, 2020, 71(8): 3527-3534.

Figures/Tables 15

Fig.1 Atomization parameters measurement system based on trajectory imaging method

Fig.2 Typical image process of atomization angle

Fig.3 Schematic diagram of trajectory imaging method

Fig.4 Typical image process of atomization fineness and droplet velocity

Fig.5 Trajectory image of dynamic standard particle and measurement results of particle size

Fig.6 Measurement results of atomization angle of nozzles with different pore sizes

Fig.7 Measurement results of atomization angle under different pressures

Fig.8 Size distribution of droplet particles of nozzles with different apertures

Table 1 Average diameter of droplet particles of nozzles with different apertures

孔径/mm	平均直径/μm
0.66	101.55
0.91	121.24
1.10	128.79

Fig.9 Size distribution of droplet particles of nozzle under different pressures

Table 2 Average diameter of droplet particles of nozzles under different pressures

压力/MPa	平均直径/μm
0.1	173.47
0.2	161.78
0.3	109.93
0.4	96.74

Fig.10 Velocity distribution of droplet particles of nozzles with different apertures

Table 3 Average velocity of droplet particles of nozzles with different apertures

孔径/mm	平均速度/(m/s)
0.66	12.44
0.91	15.02
1.10	17.20

Fig.11 Velocity distribution of droplet particles under different pressures

Table 4 Average velocity of droplet particles of nozzles under different pressures

压力/MPa	平均速度/(m/s)
0.1	6.74
0.2	10.87
0.3	12.31
0.4	13.15

References 30

1	Lefebvre A H. Atomization and Sprays [M]. New York: CRC Press, 1989.
2	Ashgriz N. Handbook of Atomization and Sprays [M]. New York, USA: Springer US, 2011.
3	何勇, 肖舒裴, 方慧, 等. 植保无人机施药喷嘴的发展现状及其施药决策[J]. 农业工程学报, 2018, 34(13): 113-124.
	He Y, Xiao S P, Fang H, et al. Development situation and spraying decision of spray nozzle for plant protection UAV[J]. Transactions of the Chinese Society of Agricultural Engineering, 2018, 34(13): 113-124.
4	王鹏飞, 刘荣华, 汤梦, 等. 煤矿井下高压喷雾雾化特性及其降尘效果实验研究[J]. 煤炭学报, 2015, 40(9): 2124-2130.
	Wang P F, Liu R H, Tang M, et al. Experimental study on atomization characteristics and dust suppression efficiency of high-pressure spray in underground coal mine[J]. Journal of China Coal Society, 2015, 40(9): 2124-2130.
5	施丽君, 周涓, 朱君, 等. 静电雾化技术在生物医药材料中的应用[J]. 材料导报, 2013, 27(13): 138-144.
	Shi L J, Zhou J, Zhu J, et al. Applications of electrospraying in biomedicine and biomaterials[J]. Materials Review, 2013, 27(13): 138-144.
6	Lee S, Park S. Spray atomization characteristics of a GDI injector equipped with a group-hole nozzle[J]. Fuel, 2014, 137: 50-59.
7	Song L, Liu T, Fu W, et al. Experimental study on spray characteristics of ethanol-aviation kerosene blended fuel with a high-pressure common rail injection system[J]. Journal of the Energy Institute, 2018, 91(2): 203-213.
8	Dorr G J, Hewitt A J, Adkins S W, et al. A comparison of initial spray characteristics produced by agricultural nozzles[J]. Crop Protection, 2013, 53(11): 109-117.
9	陈小艳, 周骛, 蔡小舒, 等. 大型喷雾粒径分布的图像法测量[J]. 化工学报, 2014, 65(2): 480-487.
	Chen X Y, Zhou W, Cai X S, et al. Particle size distribution measurement of large spray by imaging[J]. CIESC Journal, 2014, 65(2): 480-487.
10	张林国. 低压雾化喷头的结构设计及性能试验研究[D]. 镇江: 江苏大学, 2019.
	Zhang L G. Structure design and experimental research on low pressure atomizing nozzle[D]. Zhenjiang: Jiangsu University, 2019.
11	赵家丰, 聂万胜, 林伟, 等. 喷雾场内液滴粒径光学测试技术进展[J]. 激光技术, 2019, 43(5): 112-117.
	Zhao J F, Nie W S, Lin W, et al. Research progress of optical measurement of particle size in spray[J]. Laser Technology, 2019, 43(5): 112-117.
12	Deshmukh D, Ravikrishna R V. A method for measurement of planar liquid volume fraction in dense sprays[J]. Experimental Thermal and Fluid Science, 2013, 46(4): 254-258.
13	Kuti O A, Nishida K, Zhu J. Experimental studies on spray and gas entrainment characteristics of biodiesel fuel: implications of gas entrained and fuel oxygen content on soot formation[J]. Energy, 2013, 57(8): 434-442.
14	张海滨, 白博峰, 刘利, 等. 受限空间内空心锥形喷雾-横流掺混规律[J]. 化工学报, 2012, 63(5): 1354-1359.
	Zhang H B, Bai B F, Liu L, et al. Mixing characteristics of hollow cone spray with confined crossflow[J]. CIESC Journal, 2012, 63(5): 1354-1359.
15	Su M X, Li J F, Mao W P, et al. Water mist fire extinguishing spray measurement[C]//The 9th Annual Conference on Liquid Atomization and Spray Systems-Asia. Shanghai, China, 2004.
16	Cheng T C, Hochgreb S. Fundamental spray combustion characteristics of rapeseed biodiesel, diesel and blend[J]. Energy Procedia, 2015, 75: 2394-2399.
17	Rodrigues H C, Tummers M J, Veen E H V, et al. Spray flame structure in conventional and hot-diluted combustion regime[J]. Combustion and Flame, 2015, 162(3): 759-773.
18	李继保, 岳明, 杨茂林. 锥形液膜Kevin-Helmholtz波不稳定性的实验研究[J]. 航空动力学报, 2007, 22(3): 337-341.
	Li J B, Yue M, Yang M L. Experimental research of instability of Kevin-Helmholtz wave on conical sheets [J]. Journal of Aerospace Power, 2007, 22(3): 337-341.
19	Santangelo P E. Characterization of high-pressure water-mist sprays: experimental analysis of droplet size and dispersion[J]. Experimental Thermal and Fluid Science, 2010, 34(8): 1353-1366.
20	Chen X, Zhou W, Cai X, et al. In-line imaging measurements of particle size, velocity and concentration in a particulate two-phase flow[J]. Particuology, 2014, 13(2): 106-113.
21	吴学成, 王怀, 胡倩, 等. 基于轨迹图像的煤粉颗粒速度和粒径测量[J]. 浙江大学学报(工学版), 2011, 45(8): 1458-1462.
	Wu X C, Wang H, Hu Q, et al. Velocity and size measurement of coal particle by trajectory imaging[J]. Journal of Zhejiang University (Engineering Science), 2011, 45(8): 1458-1462.
22	Zhou W, Hu J, Feng M, et al. Study on imaging method for measuring droplet size in large sprays[J]. Particuology, 2015, 22(5): 100-106.
23	刘海龙, 陈孝震, 蔡小舒, 等. 基于轨迹图像的气液旋风分离器液滴粒度、浓度、速度的在线测量[J]. 化工学报, 2012, 63(6): 1729-1734.
	Liu H L, Chen X Z, Cai X S, et al. In-line measurement of size, concentration and velocity of drops from gas-liquid cyclone separator based on trajectory image processing[J]. CIESC Journal, 2012, 63(6): 1729-1734.
24	王怀. 基于轨迹图像的煤粉颗粒速度和粒径测量试验研究[D]. 杭州: 浙江大学, 2011.
	Wang H. Study on velocity and size measurement of coal particle based on trajectory imaging[D]. Hangzhou: Zhejiang University, 2011.
25	曹建明. 液体喷雾学[M]. 北京: 北京大学出版社, 2013.
	Cao J M. Liquid Sprays[M]. Beijing: Peking University Press, 2013.
26	郭斯羽, 翟文娟, 唐求, 等. 结合Hough变换与改进最小二乘法的直线检测[J]. 计算机科学, 2012, 39(4): 196-200.
	Guo S Y, Zhai W J, Tang Q, et al. Combining the Hough transform and an improved least squares method for line detection[J]. Computer Science, 2012, 39(4): 196-200.
27	陈天华. 数字图像处理及应用: 使用MATLAB分析与实现[M]. 北京: 清华大学出版社, 2018.
	Chen T H. Digital Image Processing and Application Using MATLAB[M]. Beijing: Tsinghua University Press, 2018.
28	Huang S C, Yeh C H. Image contrast enhancement for preserving mean brightness without losing image features[J]. Engineering Applications of Artificial Intelligence, 2013, 26(5/6): 1487-1492.
29	Bai X, Zhou F, Xue B. Image enhancement using multi scale image features extracted by top-hat transform[J]. Optics and Laser Technology, 2011, 44(2): 328-336.
30	Sha C, Hou J, Cui H. A robust 2D Otsu s resholding method in image segmentation[J]. Journal of Visual Communication and Image Representation, 2016, 41: 339-351.

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