刘懿,梁娜,雷基林,等.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.
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
DOI：10.13949/j.cnki.nrjgc.2025.04.003
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
基金项目:云南省基础科研项目（202301AT070384）
作者单位E-mail
刘懿 昆明理工大学 交通工程学院，昆明 650500 lqyi@kust.edu.cn 
梁娜 昆明理工大学 交通工程学院，昆明 650500 2510750652@qq.com 
雷基林* 昆明理工大学 交通工程学院，昆明 650500
云南交通运输职业学院，安宁 650300 		leijilin@sina.com 
邓晰文 昆明理工大学 交通工程学院，昆明 650500 xiwen@kust.edu.cn 
杨华 昆明理工大学 交通工程学院，昆明 650500 1679965154@qq.com 
杨旭东 昆明理工大学 交通工程学院，昆明 650500 1367656712@qq.com 
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摘要:结合柴油燃料的实际组成与物性，选择正十二烷作为试验液体，对100 ℃液滴撞击低温壁面的动态行为特性进行了观测与分析。研究结果表明，区别于常温液滴低温壁面撞壁过程，高温液滴撞壁过程中液膜上表面会产生半透明的阴影结构并随着液膜铺展。随着壁面温度的降低及初速度的增大，该阴影结构颜色逐渐加深，结构逐渐扭曲呈波浪状。高温液滴撞壁铺展过程较常温液滴也发生了较大改变，现有的常温条件下的预测最大铺展因子βmax的模型及预测最大铺展直径时间tmax的模型并不适用于100 ℃液滴撞击低温壁面的试验条件。经分析拟合得到了高温液滴撞壁液膜铺展模型。100 ℃高温液滴的撞壁破碎阈值较常温液滴也发生了较大改变，通过对现有模型的比较分析得到了适用该试验的液滴破碎阈值模型。
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.
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