A methodology for regulating fuel stratification and improving fuel economy of GCI mode via double main-injection strategy

IF 3.1 4区 工程技术 Q3 ENERGY & FUELS
Haoqing Wu, Yaoyuan Zhang, Shijie Mi, Wenbin Zhao, Zhuoyao He, Yong Qian, Xingcai Lu
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引用次数: 2

Abstract

Gasoline compression ignition (GCI) combustion faces problems such as high maximum pressure rise rate (MPRR) and combustion deterioration at high loads. This paper aims to improve the engine performance of the GCI mode by regulating concentration stratification and promoting fuel-gas mixing by utilizing the double main-injection (DMI) strategy. Two direct injectors simultaneously injected gasoline with an octane number of 82.7 to investigate the energy ratio between the two main-injection and exhaust gas recirculation (EGR) on combustion and emissions. High-load experiments were conducted using the DMI strategy and compared with the single main-injection (SMI) strategy and conventional diesel combustion. The results indicate that the DMI strategy have a great potential to reduce the MPRR and improve the fuel economy of the GCI mode. At a 10 bar indicated mean effective pressure, increasing the main-injection-2 ratio (Rm−2) shortens the injection duration and increases the mean mixing time. Optimized Rm−2 could moderate the trade-off between the MPRR and the indicated specific fuel consumption with both reductions. An appropriate EGR should be adopted considering combustion and emissions. The DMI strategy achieves a highly efficient and stable combustion at high loads, with an indicated thermal efficiency (ITE) greater than 48%, CO and THC emissions at low levels, and MPRR within a reasonable range. Compared with the SMI strategy, the maximum improvement of the ITE is 1.5%, and the maximum reduction of MPRR is 1.5 bar/°CA.

采用双主喷射策略调节燃油分层和提高GCI模式燃油经济性的方法
汽油压缩点火(GCI)燃烧面临着最大压升率(MPRR)过高和高负荷下燃烧劣化等问题。本文旨在利用双主喷射(DMI)策略,通过调节浓度分层和促进燃气混合来改善GCI模式下的发动机性能。两个直喷器同时喷射辛烷值为82.7的汽油,考察两个主喷和废气再循环(EGR)之间的能量比对燃烧和排放的影响。采用DMI策略进行了高负荷试验,并与单主喷(SMI)策略和常规柴油燃烧进行了比较。结果表明,DMI策略在降低GCI模式的MPRR和提高燃油经济性方面具有很大的潜力。在指示的平均有效压力为10 bar时,增加主注-2比(Rm -2)缩短了注入时间,增加了平均混合时间。优化后的Rm - 2可以缓和MPRR和指示比油耗之间的权衡,同时降低两者。考虑到燃烧和排放,应采用适当的EGR。DMI策略在高负荷下实现了高效稳定的燃烧,指示热效率(ITE)大于48%,CO和THC排放水平较低,MPRR在合理范围内。与SMI策略相比,ITE的最大改善为1.5%,MPRR的最大降低为1.5 bar/°CA。
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来源期刊
Frontiers in Energy
Frontiers in Energy Energy-Energy Engineering and Power Technology
CiteScore
5.90
自引率
6.90%
发文量
708
期刊介绍: Frontiers in Energy, an interdisciplinary and peer-reviewed international journal launched in January 2007, seeks to provide a rapid and unique platform for reporting the most advanced research on energy technology and strategic thinking in order to promote timely communication between researchers, scientists, engineers, and policy makers in the field of energy. Frontiers in Energy aims to be a leading peer-reviewed platform and an authoritative source of information for analyses, reviews and evaluations in energy engineering and research, with a strong focus on energy analysis, energy modelling and prediction, integrated energy systems, energy conversion and conservation, energy planning and energy on economic and policy issues. Frontiers in Energy publishes state-of-the-art review articles, original research papers and short communications by individual researchers or research groups. It is strictly peer-reviewed and accepts only original submissions in English. The scope of the journal is broad and covers all latest focus in current energy research. High-quality papers are solicited in, but are not limited to the following areas: -Fundamental energy science -Energy technology, including energy generation, conversion, storage, renewables, transport, urban design and building efficiency -Energy and the environment, including pollution control, energy efficiency and climate change -Energy economics, strategy and policy -Emerging energy issue
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