Exploring the effects of diesel start of injection and water-in-ethanol concentration on a reactivity controlled compression ignition engine

Rosa, Josimar Souza; Martins, Mario; Telli, Giovani Dambros; Altafini, Carlos Roberto; Wander, Paulo Roberto; Rocha, Luíz Alberto Oliveira

doi:10.1016/j.fuel.2020.118751

Cited by 23 publications

(7 citation statements)

References 63 publications

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“…In their work, Rosa et al concluded that efficient RCCI combustion can only be achieved by advanced DITs and also, early DIT resulted in higher maximum combustion pressure. 36 Overall, in the RCCI engine, DIT has critical impacts on the combustion characteristics since the start of a direct injection directly controls the rate and time of the air-fuel mixing process. 37 According to numerical research by Mohammadian et al, the influence of injection timing in a singlecylinder heavy-duty RCCI engine was investigated.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the impacts of combustion chamber bowl geometry and injection timing on a reactivity controlled compression ignition engine at low and high load conditions

Jafari

Seddiq

Mirsalim

2020

International Journal of Engine Research

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The present paper aims to assess the impacts of diesel injection timing and two bowl geometries including re-entrant and wide-shallow combustion chambers on the combustion characteristics, emissions formation, and fuel consumption in a reactivity controlled compression ignition diesel engine under low and high load (five and nine bar indicating mean effective pressure) conditions. The results revealed that diesel injection at −60 CA ATDC under low load conditions significantly decreased soot and NOx emissions simultaneously for both piston bowl geometries. The use of the wide-shallow chamber decreased the period of the ignition delay and increased the engine operable load range as a result of more stable combustion under high-load conditions compared to the re-entrant chamber. Moreover, at all diesel injection timings, the indicated specific fuel consumption was decreased by nearly 4.8 and 6.6% under low and high load conditions, respectively when the wide-shallow combustion chamber was used since the heat transfer loss was lower than that of the re-entrant chamber. However, NOx emission under high load conditions at the center of the combustion chamber and more soot emission in the exhaust gas are two disadvantages of the wide-shallow chamber versus the re-entrant combustion chamber.

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Section: Introductionmentioning

confidence: 99%

Assessment of the impacts of combustion chamber bowl geometry and injection timing on a reactivity controlled compression ignition engine at low and high load conditions

Jafari

Seddiq

Mirsalim

2020

International Journal of Engine Research

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“…This reality may raise fossil fuel prices as consumption continues to climb due to population growth and improvements in living standards (Mittal et al, 2015;U.S. Energy Information Administration, 2015;Rosa et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…Among these combustion strategies, low temperature combustion (LTC) has received much attention because it can provide higher efficiencies in relation to conventional combustion modes and it is possible to run with flexible fuels (Srivastava et al, 2018;Krishnamoorthi et al, 2019). LTC concepts include several techniques, such as homogeneous charge compression ignition (HCCI), premix charge compression ignition (PCCI) and reactivity-controlled compression ignition (RCCI) (Agarwal et al, 2017;Rosa et al, 2020). One of the LTC concepts is the Homogeneous Charge Compression Ignition (HCCI) combustion, also known as Controlled Auto-ignition (CAI) combustion, which uses the basic elements of compression ignition (CI) and spark ignition (SI) (Agarwal et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…Although the HCCI combustion mode has numerous inherent advantages over traditional SI and CI modes, it still has several limits and technological challenges to overcome in real-world applications. The challenges to overcome are controlled autoignition timing, combustion phase, low power output, high levels of CO and HC emissions and homogeneous mixture preparation (Bendu and Murugan, 2014;Saxena and Bedoya, 2013;. Controlling the ignition timing and combustion phasing, on the other hand, are two key challenges that impact the high pressure rise rate, knocking, operation range limitation, and even thermal efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study of Water Addition on the Combustion Characteristics in an Hcci Ethanol Engine

Telli

Rosa²,

Costa³

et al. 2022

RETERM

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Low-temperature combustion modes have attracted global attention in recent years, especially the homogeneous charge compression ignition (HCCI) mode. The HCCI combustion produces high-speed combustion, achieving relatively high thermal efficiencies while emitting low NOX and soot. However, due to the lack of direct control to start the combustion, one of the main challenges in this type of engine is to ensure that auto-ignition occurs close to the top dead center for a wide operation range. There are a few combustion phase control techniques to solve this limitation, and one of them is water injection. In this regard, this paper explores the influence of water concentration in an ethanol HCCI engine as a form of combustion phasing control. The work was conducted numerically using a zero-dimensional single-zone model with a chemical kinetic mechanism containing 56 species and 383 reactions. The numerical model results were well agreed with the reported experimental data. The water fraction ranged from 0 to 18% by mass at 3% intervals. The results demonstrate that water injection is an efficient strategy to control the combustion phasing by adjusting the charge reactivity. The increase in water fraction reduced in-cylinder pressure and heat release rates. Furthermore, the combustion phase was advanced, the combustion duration was extended, and thermal efficiency was about 44.3% with the increase in water concentration.

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“…In this study, combustion chamber velocity profiles, fuel mass change, temperature, pressure, heat release rate were determined for standard operating conditions. Rosa et al [22] used a single-cylinder research engine to experimentally determine the effect of different strategies and fuel injection duration on combustion, emission characteristics and engine performance. They found that advanced injection time increased the RoHR in the early stages of combustion.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of a heavy-duty diesel engine to evaluate the effect of fuel injection duration on engine performance and emission

Kharkeshi

Shafaghat

Mohebi

et al. 2021

IJE

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Exploring the effects of diesel start of injection and water-in-ethanol concentration on a reactivity controlled compression ignition engine

Cited by 23 publications

References 63 publications

Assessment of the impacts of combustion chamber bowl geometry and injection timing on a reactivity controlled compression ignition engine at low and high load conditions

Assessment of the impacts of combustion chamber bowl geometry and injection timing on a reactivity controlled compression ignition engine at low and high load conditions

Numerical Study of Water Addition on the Combustion Characteristics in an Hcci Ethanol Engine

Numerical simulation of a heavy-duty diesel engine to evaluate the effect of fuel injection duration on engine performance and emission

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