不同壁面特性下燃料喷雾的撞壁过程

doi:10.13229/j.cnki.jdxbgxb.20231393

摘要/Abstract

摘要：

为了对撞壁喷雾的发展及蒸发过程进行主动控制，采用不同方法制备了具有不同微观结构和润湿性的金属壁面。基于高速摄影平台对不同壁面润湿性、壁面温度和环境背压下柴油和正丁醇喷雾撞壁后的形态发展过程进行了研究。结果表明：增加亲油表面的粗糙度可增强表面的亲油性。采用表面能修饰方法可显著减弱表面亲油性。随着表面亲油性的减弱，燃料喷雾撞壁后的铺展半径和卷吸高度均升高。与柴油液滴相比，正丁醇液滴对表面的浸润性更强，导致正丁醇喷雾撞击不同表面后的铺展范围均较小。与正丁醇相比，壁面温度对柴油喷雾的铺展半径影响较小，柴油喷雾撞击不同温度壁面后期的铺展半径均高于40 mm。环境背压的升高对喷雾的扩散有抑制作用。

关键词: 动力机械工程, 喷雾撞壁, 润湿性, 壁面温度, 环境背压, 形态发展

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

中图分类号:

TK421

陈艳玲,郭亮,王会,孙万臣,李德刚,宣熔. 不同壁面特性下燃料喷雾的撞壁过程[J]. 吉林大学学报(工学版), 2025, 55(10): 3089-3099.

Yan-ling CHEN,Liang GUO,Hui WANG,Wan-chen SUN,De-gang LI,Rong XUAN. Fuel spray-wall impingement processes under different surface properties[J]. Journal of Jilin University(Engineering and Technology Edition), 2025, 55(10): 3089-3099.

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项目	柴油	正丁醇
密度/（kg·m^-3）	821.9	810.9
沸点/K	453~623	390.5
汽化潜热/（kJ·kg^-1）	251.2	430
293 K 黏度/（mm²·s^-1）	4.07	4.02
293 K 表面张力/（mN·m^-1）	29.3	26.63