Journal of Jilin University(Engineering and Technology Edition) ›› 2025, Vol. 55 ›› Issue (10): 3089-3099.doi: 10.13229/j.cnki.jdxbgxb.20231393

   

Fuel spray-wall impingement processes under different surface properties

Yan-ling CHEN1(),Liang GUO1,Hui WANG2(),Wan-chen SUN1,De-gang LI1,Rong XUAN1   

  1. 1.State Key Laboratory of Automotive Chassis Integration and Bionics，Jilin University，Changchun 130022，China
    2.School of Mechanical and Electrical Engineering，Beijing Polytechnic College，Beijing 100042，China
  • Received:2023-12-13 Online:2025-10-01 Published:2026-02-03
  • Contact: Hui WANG E-mail:1432835155@qq.com;13811099788@163.com

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Abstract:

To actively control the development and evaporation processes of the wall-impinging sprays， the metal surfaces with different microstructures and wettability were prepared with various methods. The morphological development processes of diesel and n-butanol sprays after hitting the surfaces under different surface wettability， wall temperatures and ambient back pressures were investigated based on a high-speed photography platform. The results show that increasing the roughness of the oleophilic surfaces can enhance the oleophilicity of the surfaces. The oleophilicity of the surfaces can be significantly reduced with the method of surface free energy modification. As the oleophilicity of the surfaces decreases， the spreading radius and the entrainment height of the fuel sprays after hitting the surfaces increase. Compared with diesel droplets， n-butanol droplets have a stronger wetting ability to surfaces， resulting in a smaller spreading range of n-butanol sprays after hitting different surfaces. Compared to n-butanol， the surface temperature has less influence on the spreading radius of the diesel sprays. The spreading radii of the diesel sprays are higher than 40 mm at the later stage after hitting the walls with different temperatures. The increasing ambient back pressure has an inhibitory effect on the diffusion of the sprays.

Key words: power machinery and engineering, spray-wall impingement, wettability, surface temperature, ambient back pressure, morphological development

CLC Number: 

  • TK421

Fig.1

Schematic diagram of test platform"

Table 1

Test fuel properties"

项目柴油正丁醇
密度/（kg·m-3）821.9810.9
沸点/K453~623390.5
汽化潜热/（kJ·kg-1）251.2430
293 K 黏度/（mm2·s-1）4.074.02
293 K 表面张力/（mN·m-1）29.326.63

Fig.2

SEM Photos of laser-etched surface witha roughness of 2.8 μm"

Fig.3

SEM Photos of the chemically etched surface"

Fig.4

Schematic diagram of spreading radius andentrainment height"

Fig.5

Morphological development processes of fuel sprays after hitting surfaces with different wettability"

Fig.6

Effects of surface wettability on spreadingradius and entrainment heigh of fuel sprays"

Fig. 7

Morphological development processes of fuel sprays after hitting surfaces with different temperatures"

Fig.8

Effects of surface temperature on spreadingradius and entrainment heigh of fuel sprays"

Fig. 9

Effects of ambient pressure on morphological development processes of wall-impinging fuel sprays"

Fig.10

Effects of ambient pressure on spreadingradius and entrainment heigh of fuel sprays"

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