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A kinetic algorithm for modelling the droplet evaporation process in the presence of a heat flux and background gas

热通量和背景气体存在下液滴蒸发过程建模的动力学算法

基本信息

批准号：
EP/E02243X/1
负责人：
Sergei Sazhin
金额：
$ 2.79万
依托单位：
University of Brighton
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2007
资助国家：
英国
起止时间：
2007 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FE02243X%2F1
关键词：
kinetic algorithm modelling droplet evaporation

项目摘要

Although the droplet evaporation process is essentially a kinetic one (its description requires the analysis of the distribution function of molecules), in practical engineering applications its analysis is almost universally based on the hydrodynamic approximation. Recent papers published by the PI, together with researchers from the Moscow Power Engineering Institute, point out that the latter approximation may lead to noticeable underestimates of the evaporation time of droplets in diesel engines, where the applicability of this approximation has never, to the best of our knowledge, been questioned. This conclusion, however, was made based on the simplistic kinetic model, or the numerical algorithm based on some assumptions, the applicability of which is not at first evident. For example, it was assumed that the contribution of heat flux inside the Knudsen layer can be ignored. The main focus of this work will be on the development of a new model, taking into account both the heat flux in the Knudsen layer and the presence of ambient background gas. It is expected that the temperature at the outer boundary of the Knudsen layer will be found using the condition of matching heat fluxes at the outer boundary of the Knudsen layer. This new model will be applied to the simulation of the evaporation of diesel fuel droplets in the first instance and its wider applicability is anticipated.

虽然液滴蒸发过程本质上是一个动力学过程（其描述需要分析分子的分布函数），但在实际工程应用中，其分析几乎普遍基于流体动力学近似。PI与莫斯科动力工程研究所的研究人员一起发表的最新论文指出，后一种近似法可能会导致柴油发动机中液滴蒸发时间的明显低估，据我们所知，这种近似法的适用性从未受到质疑。然而，这一结论是基于简化的动力学模型或基于某些假设的数值算法得出的，其适用性最初并不明显。例如，假设可以忽略努森层内部的热通量的贡献。这项工作的主要重点将是开发一个新的模型，同时考虑到在努森层的热通量和环境背景气体的存在。预计将使用匹配努森层外边界处的热通量的条件来找到努森层外边界处的温度。该模型将首次应用于柴油机燃油液滴蒸发过程的模拟，并具有更广泛的适用性。