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Knock characteristics of SI engine fueled with n-butanol in combination with different EGR rate

机译：正丁醇与不同EGR率结合使用的SI发动机的爆震特性

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摘要

Knock is one of the main obstacles for optimizing combustion process of SI engines fueled with alternative biomass fuel n-butanol. In this paper, knock characteristic of SI engine fueled with n-butanol and RON 92 gasoline is studied on a single cylinder SI engine. The onset timing, intensity and frequency of knock for these two fuels at different EGR rate are compared. Additionally, the effects of different compression ratios and intake pressures on knock intensity of SI engine are also studied and results are presented. The study results show that EGR can decrease knock intensity and delay knock onset timing due to its cooling and dilution effects. It is observed under a low EGR rate of 3%, knock intensity of n-butanol is significantly reduced whereas combustion pressure has negligible change. The probability distribution of n-butanol knock intensity is more concentrated compared with that of gasoline under a given EGR rate, which indicated n-butanol had smaller combustion variations. The application of EGR on high intake pressure and high compression ratio n-butanol engine can effectively suppression knock combustion. (C) 2016 Elsevier Ltd. All rights reserved.
机译：爆震是优化以替代生物质燃料正丁醇为燃料的SI发动机燃烧过程的主要障碍之一。本文研究了正丁醇和RON 92汽油为燃料的SI发动机在单缸SI发动机上的爆震特性。比较了这两种燃料在不同EGR率下的开始时间，爆震强度和爆震频率。此外，还研究了不同压缩比和进气压力对SI发动机爆震强度的影响，并给出了结果。研究结果表明，由于EGR的冷却和稀释作用，它可以降低爆震强度并延迟爆震开始时间。在3％的低EGR率下观察到，正丁醇的爆震强度显着降低，而燃烧压力的变化可忽略不计。在给定的EGR率下，正丁醇爆震强度的概率分布比汽油更集中，这表明正丁醇的燃烧变化较小。 EGR在高进气压力和高压缩比的正丁醇发动机上的应用可以有效地抑制爆震。 （C）2016 Elsevier Ltd.保留所有权利。

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