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Journal ArticleDOI

Natural Gas for High Load Dual-Fuel Reactivity Controlled Compression Ignition in Heavy-Duty Engines

01 Jul 2015-Journal of Energy Resources Technology-transactions of The Asme (American Society of Mechanical Engineers)-Vol. 137, Iss: 4, pp 042202
About: This article is published in Journal of Energy Resources Technology-transactions of The Asme.The article was published on 2015-07-01. It has received 63 citations till now. The article focuses on the topics: Carbureted compression ignition model engine & Ignition system.
Citations
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Journal ArticleDOI
TL;DR: A detailed review on the state-of-the-art of RCCI combustion has been presented in this paper, including the up-to-date research progress, including the use of alternative fuels and cetane number improvers, and the effects of fuel ratio, different injection strategies, EGR rate, CR and bowl geometry on engine performance and emissions formation.
Abstract: RCCI (reactivity controlled compression ignition) engines are found to be capable of achieving higher thermal efficiency and ultra-low NOx and PM emissions. The reactivity controlled combustion is accomplished by creating reactivity stratification in the cylinder with the use of two fuels characterized by distinctly different cetane numbers. The low reactivity (i.e., low cetane number) fuel is firstly premixed with air and then charged into the cylinder through the intake manifold; later, the high reactivity (i.e., high cetane number) fuel is injected into the charged mixture through a direct injector. Subsequently, the reactivity stratification is formed. By strategically adjusting the ratio of two fuels and injection timings, the produced reactivity gradient is able to control the combustion phasing and mitigate the pressure rise rate, as well as the heat release rate. Alternatively, structural factors such as CR (compression ratio) and piston bowl geometries can also affect the combustion characteristics of RCCI. Besides the engine management, the fuels that could be utilized in RCCI engines are also crucial to determine the evaporation, mixing, and combustion processes. To gain a comprehensive knowledge on the state-of-the-art of RCCI combustion, detailed review on the management of RCCI engines has been presented in this paper. This review covers the up-to-date research progress of RCCI including the use of alternative fuels and cetane number improvers, and the effects of fuel ratio, different injection strategies, EGR rate, CR and bowl geometry on engine performance and emissions formation. Moreover, the controllability issues are addressed in this article.

159 citations

Journal ArticleDOI
TL;DR: Low-temperature combustion is an emerging engine technology that has the ability to yield low NOx and soot emissions while maintaining high fuel efficiency as discussed by the authors, and it has been shown that low temperature combustion strategies can reduce SOI and NOx emissions.
Abstract: Low-temperature combustion is an emerging engine technology that has the ability to yield low NOx and soot emissions while maintaining high fuel efficiency. Low-temperature combustion strategies in...

150 citations

Journal ArticleDOI
15 Feb 2020-Fuel
TL;DR: In this paper, the authors compared the performance of single-and dual-fueled ACTs, such as homogeneous charge compression ignition (HCCI), PCCI and DF-PCCI, under a specified load condition at which all ACTs can be operated stably.

93 citations

Journal ArticleDOI
TL;DR: The laminar flame speed plays an important role in spark-ignition engines, as well as in many other combustion applications, such as in designing burners and predicting explosions as discussed by the authors.
Abstract: The laminar flame speed plays an important role in spark-ignition engines, as well as in many other combustion applications, such as in designing burners and predicting explosions. For this reason,...

76 citations

Journal ArticleDOI
01 Jan 2019-Fuel
TL;DR: In this paper, the effects of mixture formation on the DF-PCCI combustion with and without exhaust gas recirculation (EGR) were assessed to reduce the HC and CO emissions as well as to improve the fuel economy at low load operations.

65 citations

References
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Journal ArticleDOI
TL;DR: In this article, a fuel reactivity controlled compression ignition (RCCI) concept is demonstrated as a promising method to achieve high efficiency, which is demonstrated in a heavy-duty test engine over a range of loads.
Abstract: A fuel reactivity controlled compression ignition (RCCI) concept is demonstrated as a promising method to achieve high efficiency – clean combustion. Engine experiments were performed in a heavy-duty test engine over a range of loads. Additionally, RCCI engine experiments were compared to conventional diesel engine experiments. Detailed computational fluid dynamics modelling was then used to explain the experimentally observed trends. Specifically, it was found that RCCI combustion is capable of operating over a wide range of engine loads with near zero levels of NOx and soot, acceptable pressure rise rate and ringing intensity, and very high indicated efficiency. For example, a peak gross indicated efficiency of 56 per cent was observed at 9.3 bar indicated mean effective pressure and 1300 rev/min. The comparison between RCCI and conventional diesel showed a reduction in NOx by three orders of magnitude, a reduction in soot by a factor of six, and an increase in gross indicated efficiency of 16.4 per cen...

707 citations

Journal ArticleDOI
TL;DR: The most prominent characteristic of new combustion modes, such as HCCI, Stratified-charge Compression-Ignition (SCCI), and Low-Temperature Combustion (LTC), is the requirement of creating a homogenous mixture or controllable stratified mixture prior to ignition as discussed by the authors.

466 citations

Journal ArticleDOI
TL;DR: In this article, a reduced chemical kinetic mechanism for the oxidation of primary reference fuel (PRF) has been developed and applied to model internal combustion engines, which gives reliable performance for combustion predictions, as well as computational efficiency improvements for multidimensional CFD simulations.

401 citations

Journal ArticleDOI
TL;DR: In this paper, various low temperature combustion strategies were investigated using single cylinder engine experiments and the focus of the study was to compare engine performance and emissions, combustion sensitivity to intake conditions, and the ability to control any observed sensitivity through the fuel injection strategy.
Abstract: In the present study, various low temperature combustion strategies were investigated using single cylinder engine experiments. The combustion strategies that were investigated premix the majority of the fuel and do not require exhaust gas recirculation (EGR) to achieve ultra-low NOx and soot emissions for low- to mid-load engine operation. These types of advanced compression ignition combustion strategies have been shown to have challenges with combustion phasing control. The focus of the study was to compare engine performance and emissions, combustion sensitivity to intake conditions, and the ability to control any observed sensitivity through the fuel injection strategy. Even though these are steady state engine experiments, this will demonstrate a given combustion strategies controllability on a cycle-to-cycle basis. The combustion strategies that were investigated are fully premixed dual-fuel homogeneous charge compression ignition (HCCI), dual-fuel reactivity controlled compression ignition (RCCI),...

156 citations