Research on the calculation method of auto-ignition timing and the effect of combustion parameters on auto-ignition under knock condition

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS
Hao Yu, Yan Su, Bo Shen, Yulin Zhang, Bin Wang, Xiaoping Li, Fangxi Xie
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引用次数: 0

Abstract

Auto-ignition triggering plays an important role in the study of knock, accurate and generalized calculation methods are of great significance. In this study, a brand new calculation method of end-mixture auto-ignition timing based on heat release rate (HRR) is proposed based on several sets of data with different knock intensities of a small turbocharged gasoline engine. The calculation method effectively eliminates the effect of fluctuations in the actual HRR data by setting the search range and the auto-ignition threshold, and also eliminates the calculation delay caused by the second-order derivatives of HRR in the regular calculation method. Under this calculation method, the auto-ignition and knock characteristics present a good fit. The effects of combustion parameters on auto-ignition are significantly different. The changes in engine coolant and inlet air temperature as well as the over-rich mixture significantly affected the auto-ignition trigger pressure, while the ignition timing and the over-lean mixture had no effect on it. The effects of methanol on auto-ignition trigger pressure were also significantly different under various injection timings. The calculation of auto-ignition timing provides a vital prerequisite for the study of auto-ignition triggering, which is of obvious significance for the study of knock.

爆震条件下自燃时间计算方法及燃烧参数对自燃影响的研究
自燃触发在爆震研究中起着重要作用,精确和通用的计算方法意义重大。本研究基于几组不同爆震强度的小型涡轮增压汽油发动机数据,提出了一种全新的基于热释放率(HRR)的末端混合气自燃正时计算方法。该计算方法通过设置搜索范围和自动点火阈值,有效地消除了实际 HRR 数据波动的影响,同时也消除了常规计算方法中 HRR 二阶导数造成的计算延迟。在这种计算方法下,自燃和爆震特性呈现出良好的拟合效果。燃烧参数对自燃的影响明显不同。发动机冷却液和进气温度以及过浓混合气的变化对自燃触发压力有明显影响,而点火正时和过稀混合气则没有影响。在不同的喷油时间下,甲醇对自燃触发压力的影响也明显不同。自动点火时间的计算为研究自动点火触发提供了重要的前提条件,而自动点火触发对于研究爆震具有明显的意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of The Energy Institute
Journal of The Energy Institute 工程技术-能源与燃料
CiteScore
10.60
自引率
5.30%
发文量
166
审稿时长
16 days
期刊介绍: The Journal of the Energy Institute provides peer reviewed coverage of original high quality research on energy, engineering and technology.The coverage is broad and the main areas of interest include: Combustion engineering and associated technologies; process heating; power generation; engines and propulsion; emissions and environmental pollution control; clean coal technologies; carbon abatement technologies Emissions and environmental pollution control; safety and hazards; Clean coal technologies; carbon abatement technologies, including carbon capture and storage, CCS; Petroleum engineering and fuel quality, including storage and transport Alternative energy sources; biomass utilisation and biomass conversion technologies; energy from waste, incineration and recycling Energy conversion, energy recovery and energy efficiency; space heating, fuel cells, heat pumps and cooling systems Energy storage The journal''s coverage reflects changes in energy technology that result from the transition to more efficient energy production and end use together with reduced carbon emission.
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