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Fuel performances in Spark-Ignition (SI) engines: Impact of flame stretch

机译：火花点火（SI）发动机的燃油性能：火焰伸展的影响

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摘要

In a context of decreasing pollutant emissions, the transport sector has to tackle improvements to the engine concept as well as fuel diversification. The use of these different fuels often has an impact on the combustion performance itself. In the case of Sparlc Ignition (SI) engines, efficiency is a function of the combustion speed, i.e. the speed at which the fresh air-fuel mixture is consumed by the flame front. Every expanding flame is subject to flame curvature and strain rate, which both contribute to flame stretch. As each air-fuel mixture responds differently to flame stretch, this paper focuses on understanding the impact of flame stretch on fuel performances in SI engines. Different air-fuel mixtures (different fuels or equivalence ratios) with similar unstretched laminar burning speeds and thermodynamic properties but different responses to stretch were selected. The mixtures were studied in a turbulent spherical vessel and in an optical engine using Mie-Scattering tomography. The combustion phasing was also investigated in both optical and all-metal single cylinder engines. Results show that flame stretch sensitivity properties such as Markstein length and Lewis number, determined in laminar combustion conditions, are relevant parameters that need to be taken into consideration to predict the global performance of fuels, either experimentally or for modeling simulation. (C) 2016 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：在减少污染物排放的背景下，运输部门必须应对发动机概念的改进以及燃料的多样化。这些不同燃料的使用通常会对燃烧性能本身产生影响。对于Sparlc点火（SI）发动机，效率取决于燃烧速度，即火焰前沿消耗新鲜空气燃料混合物的速度。每个膨胀的火焰都受到火焰曲率和应变率的影响，这两者都有助于火焰的伸展。由于每种混合气对火焰伸展的反应不同，因此本文着重了解火焰伸展对SI发动机燃油性能的影响。选择了具有相似的未拉伸层流燃烧速度和热力学特性但对拉伸的响应不同的不同的空气燃料混合物（不同的燃料或当量比）。使用Mie-Scattering层析成像技术在湍流球形容器和光学引擎中研究了混合物。在光学和全金属单缸发动机中也研究了燃烧定相。结果表明，在层流燃烧条件下确定的火焰拉伸敏感性特性（例如Markstein长度和Lewis数）是相关参数，需要通过实验或模型模拟来预测燃料的整体性能。 （C）2016年燃烧研究所。由Elsevier Inc.出版。保留所有权利。

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