内燃机工程2025，Vol.46Issue(4)：19-26,8.DOI:10.13949/j.cnki.nrjgc.2025.04.003
100℃正十二烷单液滴撞击低温壁面的动态行为特性
Dynamic Behavior Characteristics of a Single 100℃ n-Dodecane Droplet Impacting Cryogenic Walls
摘要
Abstract
Based on the actual composition and physical properties of diesel fuel,n-dodecane was selected as the test fluid to observe and analyze the dynamic behavior characteristics of a single 100℃droplet impacting cryogenic walls.The research results showed that,unlike the low-temperature wall impingement process of room temperature droplets,the upper surface of the liquid film in the process of high-temperature droplet impingement produced a translucent shadow structure which spreaded with the liquid film.As the wall temperature decreased and the initial velocity increased,the color of the shadow structure deepened,and the structure was gradually twisted in a wave-like shape.The spreading process of high-temperature droplet impacting the wall was also greatly changed compared with that of room temperature droplets.The existing models for predicting the maximum spreading factor βmax and the time of predicting the maximum spreading diameter tmax under room temperature conditions are not applicable to the test conditions of 100℃droplet impacting the low-temperature wall.An analytical fit was obtained to model the liquid film spreading of high temperature droplet hitting the wall.The wall splashing threshold of 100℃ high-temperature droplets also changed greatly compared with that of room temperature droplets,and a droplet splashing threshold model suitable for this experiment by comparing and analyzing the existing models was obtained.关键词
液滴撞壁/正十二烷/高温液滴/低温壁面/低温冷起动Key words
drop impingement/n-dodecane/high temperature droplet/low-temperature wall/low-temperature cold start分类
能源科技引用本文复制引用
刘懿,梁娜,雷基林,邓晰文,杨华,杨旭东..100℃正十二烷单液滴撞击低温壁面的动态行为特性[J].内燃机工程,2025,46(4):19-26,8.基金项目
云南省基础科研项目(202301AT070384) Yunnan Fundamental Research Project(202301AT070384) （202301AT070384）
