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Droplet evaporation characteristics due to wet compression under RCM conditions

机译：在RCM条件下由于湿压缩而产生的液滴蒸发特性

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摘要

The vaporization characteristics of a single fuel droplet subjected to rapid gas-phase compression (i.e., wet compression) are computationally investigated using two spherically-symmetric models: quasi-steady (QS) and fully transient (TS). Features of the wet compression process under rapid compression machine (RCM) conditions are discussed with these compared to simulations where the far-field conditions are essentially invariant. It is observed that wet compression can significantly increase the rate of evaporation primarily due to the increase in droplet temperature and corresponding saturation pressure (fugacity); an increase in the density-weighted mass diffusivity is also beneficial in reducing the droplet consumption times. The QS model predicts substantially longer rates of evaporation relative to the TS model due to transient behavior associated with the initial evaporative cooling process, and the gas-phase compression heating process. Increases in the rate of volumetric compression can lead to more rapid droplet consumption, however there is a corresponding increase in spatial stratification in the gas- and liquid-phases which may not be advantageous for RCM applications. An 'operating map' has been developed based on parametric simulations of an n-dodecane droplet evaporating into nitrogen.
机译：使用两个球对称模型：准稳态（QS）和全瞬态（TS），对经过快速气相压缩（即湿压缩）的单个燃料液滴的汽化特性进行了计算研究。与远场条件基本不变的模拟相比，本文讨论了快速压缩机（RCM）条件下的湿压缩过程的特征。观察到，湿压缩可主要由于液滴温度和相应的饱和压力（逸度）的增加而显着提高蒸发速率；密度加权质量扩散率的增加也有利于减少液滴消耗时间。由于与初始蒸发冷却过程和气相压缩加热过程相关的瞬态行为，QS模型预测的蒸发速率相对于TS模型要大得多。体积压缩率的增加可导致液滴的消耗更快，但是气相和液相中的空间分层也相应增加，这可能对RCM应用不利。基于对正十二烷液滴蒸发成氮的参数模拟，已经开发了“操作图”。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2010年第6期|1100-1111|共12页
  • 作者

    M.V. Johnson; G.S. Zhu; S.K. Aggarwal; S.S. Goldsborough;

  • 作者单位

    Department of Mechanical Engineering, Marquette University, P.O. Box 1881, Milwaukee, WI 53201-1881, USA;

    HDEP Performance and Emissions, DTNA - Detroit Diesel Corporation, 13400 Outer Dr., West Detroit, Ml 48239, USA;

    Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, 1030 Engineering Research Facility, 842 W. Taylor Street, Chicago, IL 60607, USA;

    Department of Mechanical Engineering, Marquette University, P.O. Box 1881, Milwaukee, WI 53201-1881, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    wet compression; droplet evaporation; aerosol RCM;

    机译：湿压缩液滴蒸发气溶胶RCM;

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