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Hydraulic characterization of Diesel and water emulsions using momentum flux

机译：利用动量通量对柴油和水乳液的水力表征

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摘要

Diesel and water emulsions have the potential to be used in compression ignition engines to control the emissions of NOx and PM. Very little is known about the influence emulsification will have on the fuel sprays formed during injection. This paper outlines the measurement of the momentum flux of injection sprays of Diesel fuel and Diesel fuel emulsions containing 10% and 20% water, with the goal of hydraulically characterizing the sprays and identifying the influence emulsification may have on them. The momentum flux, mass flow, instantaneous mass flow, discharge coefficient, injection velocity, momentum coefficient and momentum efficiency have been examined. The injections were carried out in a high pressure chamber filled with nitrogen. The measured momentum flux is observed to increase with increasing injection pressure in a linear form. Increasing the ambient density in the chamber resulted in a decrease in the measured momentum flux. The emulsified fuel sprays had a very similar momentum flux as the neat Diesel fuel sprays. The total mass of emulsified fuel injected was less than for neat Diesel at corresponding condition. The instantaneous mass flow rate was determined using a normalized form of the momentum flux measurement and the independently measured total mass injected. The emulsions tended to have a lower discharge coefficient and there is no evidence that the nozzle is cavitating at these conditions. The emulsified fuels have tended to have a higher injection velocity than the neat Diesel fuel sprays. The momentum efficiency is introduced, which uses the instantaneous mass measurement and the theoretical velocity of the spray. The emulsified fuels have a larger momentum efficiency, a result of their high injection velocity compared with the neat Diesel fuel. (C) 2015 Published by Elsevier Ltd.
机译：柴油和水乳化剂有潜力用于压缩点火发动机中，以控制NOx和PM的排放。关于乳化对喷射过程中形成的燃料喷雾的影响知之甚少。本文概述了柴油燃料和水含量分别为10％和20％的柴油燃料乳液的喷射喷雾的动量通量的测量，目的是对喷雾进行水力表征，并确定乳化对其可能产生的影响。检查了动量通量，质量流量，瞬时质量流量，排放系数，喷射速度，动量系数和动量效率。注射在充满氮气的高压室中进行。观察到测量的动量通量随着线性增加的注射压力而增加。腔室中环境密度的增加导致测得的动量通量减小。乳化燃料喷雾具有与纯柴油燃料喷雾非常相似的动量通量。在相应条件下，喷射的乳化燃料总质量小于纯柴油。使用动量通量测量值的标准化形式和独立测量的注入总质量值确定瞬时质量流量。乳液倾向于具有较低的排放系数，并且没有证据表明喷嘴在这些条件下是空化的。乳化燃料倾向于具有比纯柴油燃料喷雾更高的喷射速度。引入了动量效率，该动量效率使用了瞬时质量测量和喷雾的理论速度。与纯柴油相比，乳化燃料具有较高的喷射速度，因此动量效率更高。 （C）2015年由Elsevier Ltd.出版

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  • 来源
    《Fuel》 |2015年第15期|23-33|共11页
  • 作者

    Emberson D. R.; Ihracska B.; Imran S.; Diez A.; Lancaster M.; Korakianitis T.;

  • 作者单位

    Queen Mary Univ London, Sch Engn & Mat Sci, London E1 4NS, England;

    Univ Hertfordshire, Sch Engn, Hatfield AL10 9AB, Herts, England;

    Univ Engn & Technol, Dept Mech Engn, Lahore, Pakistan;

    Izmir Inst Technol, TR-35430 Izmir, Turkey;

    Adv Engine Res Ltd, Basildon SS13 1LE, Essex, England;

    St Louis Univ, Parks Coll Engn Aviat & Technol, St Louis, MO 63103 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

    Diesel water emulsions; Fuel injection; Momentum flux; Instantaneous mass flow rate;

    机译：柴油水乳液;燃油喷射;动量通量;瞬时质量流量;

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