期刊
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING
卷 235, 期 2-3, 页码 387-399出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/0954407020958581
关键词
Secondary breakup; spray modeling; two-phase flow; turbulence modeling
This paper examines the importance of turbulence effects on the secondary breakup of droplets, showing that turbulence intensity significantly affects the critical Weber number. The study reveals that turbulence causes droplets to break earlier, leading to faster evaporation rates and shorter spray tip penetration lengths. Additionally, the research suggests that as gas pressure increases, the disparity between results from models with and without turbulence effects diminishes, indicating a decreased impact of turbulence at higher gas pressures.
In this paper, the importance of turbulence effects on the procedure of droplet's secondary breakup is studied. In the process of modeling the secondary breakup of a droplet, it is a common practice to presume that the droplet is moving in a laminar flow. However, it is evident that the critical Weber number is profoundly affected by the intensity of turbulence presented in the flow. As a result, the abovementioned supposition may lead to significant computational inaccuracy. This paper tends to perform a modification that considers the effects of turbulent flow on the secondary breakup of droplets. It is shown that the results obtained by the modified model are more precise and in a better agreement with experimental data. In this paper, spray behavior is predicted by a conventional breakup model and the one obtained by a modified model, which are both implemented in an in-house computer code. This CFD code accounts for engine simulation by solving the governing two-phase-flow equations using the Eulerian-Lagrangian approach in a three-dimensional coordinate system. To show the effects of turbulence, the changes in spray parameters such as droplet size distribution, spray tip penetration, and spray mean diameter, which is extracted from the two models are compared. Results have shown that the turbulence causes droplets to break in an earlier time, which leads to a higher rate of evaporation and lower penetration length. An interesting fact concluded in this paper is that the difference between the results of the two models decreases as the gas pressure is increased, which means the effects of turbulence become less important as the gas pressure increases.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据