Experimental investigation on the spray characteristics of agricultural full-cone pressure swirl nozzle

IF 2.2 2区农林科学 Q2 AGRICULTURAL ENGINEERING

International Journal of Agricultural and Biological Engineering Pub Date : 2023-01-01 DOI:10.25165/j.ijabe.20231604.7088

Xiuyun Xue, Xufeng Xu, Shilei Lyu, Shuran Song, Xin Ai, Nengchao Li, Zhenyu Yang, Zhen Li

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引用次数: 0

Abstract

The spray characteristics of a full-cone pressure swirl nozzle have been investigated in this study. The results were defined by Reynolds number, which focuses on the breakup of liquid film, droplet size, velocity, and liquid volume flux under different Reynolds numbers at the near-field spray. The spray structure was visualized using a high-speed camera, and the characteristics of droplets were measured using a Phase Doppler Anemometer (PDA) in both the radial and axial directions. The tests were carried out at varying spray pressures (0.2 to 1.0 MPa), corresponding to different Reynolds numbers (5369 to 12006). It was found that when the Reynolds number rises, the liquid became more unstable after leaving the nozzle, causing the liquid film to break up faster. According to the measurements of PDA, the coalescence of droplets increased due to the centrifugal effect. What’s more, the velocity of the droplets fluctuates significantly in the radial direction, and the droplets with a smaller particle size had a higher average velocity. From the perspective of liquid distribution, the increase in Reynolds number caused the spray liquid to move in the radial direction gradually. In contrast, the liquid volume distribution changed in the radial direction more obviously than in the axial direction, growing to the maximum along the radial direction and gradually reducing. It can provide a reference for selecting operating parameters for actual agricultural spray operations and the design of electrostatic nozzles through the research on breakup and droplet characteristics. Keywords: full-cone pressure swirl nozzle, droplet size, droplet velocity, liquid volume flux, high-speed camera, PDA DOI: 10.25165/j.ijabe.20231604.7088 Citation: Xue X Y, Xu X F, Lyu S L, Song S R, Ai X, Li N C, et al. Experimental investigation on spray characteristics of agricultural full-cone pressure swirl nozzle. Int J Agric & Biol Eng, 2023; 16(4): 29–40.

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农用全锥压力旋流喷嘴喷雾特性试验研究

对全锥压力旋流喷嘴的喷雾特性进行了研究。结果用雷诺数来定义，重点研究了不同雷诺数下近场喷雾液膜破裂、液滴大小、速度和液体体积通量。利用高速摄像机对喷雾结构进行了可视化，并利用相位多普勒风速仪(PDA)在径向和轴向测量了液滴的特性。试验在不同的喷射压力(0.2至1.0 MPa)下进行，对应于不同的雷诺数(5369至12006)。研究发现，当雷诺数升高时，液体离开喷嘴后变得更加不稳定，导致液膜破裂速度加快。根据PDA的测量，由于离心效应，液滴的聚并增加。此外，液滴的速度在径向上波动较大，粒径越小的液滴平均速度越高。从液体分布来看，雷诺数的增加使喷雾液体逐渐向径向运动。相比之下，液体体积分布在径向上的变化比在轴向上的变化更明显，沿径向增长到最大，然后逐渐减小。通过对喷雾破碎和雾滴特性的研究，可以为实际农业喷雾作业的操作参数选择和静电喷嘴的设计提供参考。关键词:全锥压力旋流喷嘴，液滴尺寸，液滴速度，液体体积通量，高速相机，PDA DOI: 10.25165/ j.j ijabe.20231604.7088引用本文:薛学勇，徐晓峰，吕树林，宋树荣，艾旭，李乃春，等。农用全锥压力旋流喷嘴喷雾特性试验研究。农业与生物工程学报，2023;16(4): 29-40。

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来源期刊

International Journal of Agricultural and Biological Engineering AGRICULTURAL ENGINEERING-

CiteScore

4.30

自引率

12.50%

发文量

审稿时长

24 weeks

期刊介绍： International Journal of Agricultural and Biological Engineering (IJABE, https://www.ijabe.org) is a peer reviewed open access international journal. IJABE, started in 2008, is a joint publication co-sponsored by US-based Association of Agricultural, Biological and Food Engineers (AOCABFE) and China-based Chinese Society of Agricultural Engineering (CSAE). The ISSN 1934-6344 and eISSN 1934-6352 numbers for both print and online IJABE have been registered in US. Now, Int. J. Agric. & Biol. Eng (IJABE) is published in both online and print version by Chinese Academy of Agricultural Engineering.