火箭推进2026，Vol.52Issue(4)：1-13,13.DOI:10.3969/j.issn.1672-9374.2026.04.001
正癸烷超临界液膜蒸发界面演化与相变机理
Interface evolution and phase transition mechanism of n-decane supercritical liquid film evaporation
摘要
Abstract
To reveal the evolution mechanism of gas-liquid interfaces for kerosene under supercritical environments,this paper takes n-decane,a single-component surrogate fuel for kerosene,as the research object.A molecular dynamics method was employed to construct an evaporation model of an n-decane liquid film in a nitrogen environment.The geometric characteristics,evolution patterns,and dynamic behaviors of the gas-liquid interface under subcritical and supercritical conditions were systematically investigated.The results showed that under supercritical conditions,the thickness of the gas-liquid interface increased rapidly with time,the Knudsen number dropped below 0.2,and the interface transitioned from a discontinuous interface to a continuous transition region.Under supercritical conditions,the liquid film thickness exhibited an expanding trend(reaching up to 1.28 times the initial thickness),while under subcritical conditions,it continuously shrank.The gas-liquid interface surface tension gradually decreased during evaporation and approached zero under high-temperature and high-pressure conditions.Through a comparative analysis of the temperature-fuel mole fraction distribution and the vapor-liquid equilibrium curve,it was confirmed that the supercritical transition occurs when the liquid film temperature exceeds the mixture critical point,and this transition is a dynamic heat and mass transfer process.The evaporation lifetime of the liquid film decreases with increasing ambient temperature.At low temperatures,it first decreases and then increases with pressure affected by the latent heat of vaporization,while at high temperatures,it monotonically decreases with pressure.This study reveals the phase transition mechanism of n-decane under supercritical conditions from the molecular scale and provides a theoretical basis for establishing supercritical combustion models for engines.关键词
正癸烷/超临界蒸发/分子动力学/气液界面/相变机理Key words
n-decane/supercritical evaporation/molecular dynamics/gas-liquid interface/phase transition mechanism分类
航空航天引用本文复制引用
王博涵,曹一腾,毛倩,唐勇,石保禄,侯晓..正癸烷超临界液膜蒸发界面演化与相变机理[J].火箭推进,2026,52(4):1-13,13.基金项目
国家自然科学基金(52576104,U23B6009) （52576104,U23B6009）
