Experimental Study on Impingement Processes of Fuel Sprays on Biomimetic Structured Surfaces  

作　　者：Yanling Chen Liang Guo Wanchen Sun Yuying Yan Rong Xuan Junfeng Zhang 

机构地区：[1]State Key Laboratory of Automotive Simulation and Control,Jilin University,Changchun 130025,China [2]Faculty of Engineering,University of Nottingham,Nottingham NG72RD,UK

出　　处：《Journal of Bionic Engineering》2024年第1期362-373,共12页仿生工程学报（英文版）

基　　金：the financial support from the Natural Science Foundation of Jilin Province(Project code:20220101212JC);Jilin Province Specific Project of Industrial Technology Research&Development(Project code:2020C025-2);Free Exploration Project of Changsha Automotive Innovation Research Institute of Jilin University(Project code:CAIRIZT20220202);2021"Interdisciplinary Integration and Innovation"Project of Jilin University(Project code:XJRCYB07);Horizon 2020 MSCA(Project code:H2020-MSCA-RISE-778104-ThermaSMART).

摘　　要：To improve the controllability of the wall-wetting process after the fuel spray-wall impingement in internal combustion engines,the methods of laser etching,chemical etching and surface free energy modification are used to prepare biomimetic structured surfaces with different wettability.The impingement processes of diesel and n-butanol sprays on the walls under different conditions are experimentally investigated.As the surface oleophilicity increases,the spreading radius of wall-impinging sprays decreases.At about 5 s after the fuel injections,the fuel spray droplets hit the walls for the first time,and the secondary breakup and rebound occur.The mixture concentrations of different fuels hitting the various walls reach the peak value.Under a higher surface temperature,the peak value of the mixture concentration is mainly related to the heat flux to the fuel droplets in different boiling regimes from the metal surfaces.The concentration of the air–fuel mixture in the near wall region increases with increasing surface oleophilicity,increasing wall temperature and decreasing ambient pressure.Compared with diesel,n-butanol presents a higher air–fuel mixture concentration in the near wall region.

关 键 词：Spray-wall impingement Morphological development Air-fuel mixture concentration Surface wettability Wall temperature:Ambient pressure 

分 类 号：Q81[生物学—生物工程]