Fuel effect on the liquid-phase penetration of an evaporating spray under transient diesel-like conditions
Fuel effect on the liquid-phase penetration of an evaporating spray under transient diesel-like conditions
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DOI：
10.1016/j.fuel.2011.05.006
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发表时间：
2011-11
期刊：
影响因子：
7.4
通讯作者：
J. Pastor;J. M. García-Oliver;Jean-Guillaume Nerva;B. Giménez
中科院分区：
文献类型：
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作者：
J. Pastor;J. M. García-Oliver;Jean-Guillaume Nerva;B. Giménez
在大量热力学和喷射条件下，通过光学发动机中的单孔喷嘴喷射五种不同的燃料，进行了最大液相渗透的测量。本文的重点是双重的。首先，打算研究燃料物理性质对液相燃料渗透的影响。选择费托柴油 (FTD) 和生物柴油燃料的主要原因是它们在短期或中期可能替代传统柴油燃料的潜力。提供了环境条件下燃料物理和化学性质的广泛表征，并与液相渗透相关，以便提供一种易于使用的工具，基于廉价的发动机外测量来预测液体喷雾行为。费托燃料似乎是最容易汽化的，而随着油菜籽甲酯 (RME) 速率的增加，生物柴油混合物总是变得更难汽化。这项工作的第二个目标是研究密度和温度变化时液相渗透的时间响应。在密度和温度时间导数高达 2000kgm−3s−1 和 20,000Ks−1 的瞬态类柴油条件下，在三种不同压力下进行了 8ms 喷射。在大多数情况下，喷雾似乎严格遵循根据稳态环境条件建立的经验模型做出的预测，从而得出喷雾根据其环境进行瞬时调整的结论，验证了：（1）在一维喷雾模型中做出的假设； (2)利用在非稳态环境下获得的经验模型在稳态条件下获得。
Measurements of the maximum liquid-phase penetration have been performed injecting five different fuels through a single-hole nozzle in an optical engine under a large set of thermodynamic and injection conditions. The focus of this paper is twofold. First, it intends to study fuel physical properties on liquid-phase fuel penetration. The choice made on Fischer–Tropsch diesel (FTD) and biodiesel fuels has been highly motivated by their potential to be, at short or middle term, possible substitutes to the conventional diesel fuel. Extensive characterization of fuel physical and chemical properties under ambient conditions are provided and related to the liquid-phase penetration in order to provide an accessible tool to predict liquid spray behavior based on cheap, off-engine measurements. Fischer–Tropsch fuels appeared to be the easiest to vaporize while biodiesel blends were getting always harder to vaporize as the Rapeseed Methyl Ester (RME) rate was increased. The second objective of this work is to study the time-response of liquid-phase penetration when subjected to density and temperature variations. Injections of 8ms at three different pressures have been performed in transient diesel-like conditions with density and temperature time derivatives up to 2000kgm−3s−1and 20,000Ks−1. In most cases, the spray appeared to closely follow predictions made from empirical models built out of steady-state ambient conditions, leading to the conclusion of an instantaneous adjustment of the spray to its environment, validating: (1) the hypothesis made in 1D spray models; (2) the use of empirical models in unsteady-state environment when obtained under steady-state conditions.