| Author Name | Affiliation | | Lihua Ye | School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China | | Wenjing Liu | School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China | | Jie Li | School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China | | Aiping Shi | School of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China |
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| Abstract: |
| In order to analyze the spray characteristics of non-circular nozzle holes based on the air-assisted spray system, the spray characteristics of circular and non-circular nozzles were studied under the pressure of 0.2-0.6 MPa and the spray volume of 1000-5000 mL/h. Elliptical nozzle and triangular nozzle are classified as non-circular geometries. The spray cone angle was measured by processing the spray image captured by a CCD camera. The measured spray cone angles of the circular nozzles were analyzed, and the axis switching phenomenon of minor plane of elliptical nozzle was found during the test. Among the three shapes of nozzles, the elliptical nozzle had the largest spray cone angle, and the triangular nozzle had the smallest. The velocity field obtained depended on the PIV system. The results show that for axial velocity, elliptical orifice spray has greater kinetic energy and smaller droplet size under the same working parameters. Compared with the circular and elliptical nozzles, triangular orifice reached maximum spray velocity the fastest, but its velocity decay was the fastest. For radial velocity, away from the axis, the spray velocity of the elliptical orifice was less affected by the injection parameters, and the velocity was less than that of circular orifice and triangle orifice. Increasing air pressure will weaken radial propagation. The increase of liquid spraying rate had no remarkable effect on the increase of spraying rate. The results of particle size analysis show that the particle size of the non-circular orifice is reduced compared with that of the circular orifice, which promotes the breakup of droplets to a certain extent and enhances the atomization effect. |
| Key words: non-circular nozzle air-assisted injection system PIV spray cone angle velocity field |
| DOI：10.11916/j.issn.1005-9113.21066 |
| Clc Number:TP432 |
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| Descriptions in Chinese: |
| 空气辅助喷射系统中非圆形喷孔喷雾特性研究 叶丽华1，刘雯靖1，李杰1，施爱平2 （1．江苏大学 汽车与交通工程学院，江苏 镇江212013； 2．江苏大学 农业工程学院，江苏 镇江212013） 摘要：基于空气辅助喷雾系统对圆形和非圆形喷孔的喷雾特性进行分析。分析了在不同喷射压力（0.2~0.6MPa）和不同喷射速率（1000~5000 mL/h）下圆形和非圆形喷孔的喷雾发展。研究中的非圆形几何形状包括椭圆形和三角形。通过PIV系统中的CCD相机获取喷雾图像处理获得喷雾锥角，圆形和椭圆形喷孔次平面的喷雾锥角的试验结果表明，椭圆形喷孔的喷雾锥角大于圆形孔的喷雾锥角，三角形孔的喷雾锥角最小。圆孔直径大于椭圆的短轴，次平面中椭圆喷雾锥角大于圆形的喷雾锥角，椭圆喷雾在喷射过程中存在轴切换现象。速度场由PIV系统试验分析获得。结果表明，对于轴向速度，椭圆喷孔喷雾在相同工作参数下具有更大的动能和更小的液滴尺寸。与圆形和椭圆形喷孔相比，三角形喷孔达到最大喷雾速度最快，速度的衰减也最快。对于径向速度，远离轴线，椭圆喷孔的喷射速度受喷射参数的影响较小，速度小于圆形喷孔和三角形喷孔。随着压力的增加，削弱了液滴径向发展。液滴喷射速率的增加对喷雾速度的增加没有显著影响。粒度分析结果表明，非圆形喷孔的粒径小于圆形喷孔，在一定程度上促进液滴破碎，增强了雾化效果。 关键词：非圆喷孔，空气辅助喷射系统，PIV，喷雾锥角，喷雾速度场 |
