An experimental investigation on the influence of piston bowl geometry on RCCI performance and emissions in a heavy-duty engine

Benajes, Jesús; Pastor, Javier; García, Antonio; Monsalve‐Serrano, Javier

doi:10.1016/j.enconman.2015.07.047

Cited by 78 publications

(38 citation statements)

References 43 publications

(40 reference statements)

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“…Some other geometries aimed at reducing the heat transfer losses were also tested [23], confirming that the best strategy to increase the efficiency of RCCI concept is by reducing the in-cylinder area-to-volume ratio [24]. However, these studies showed that an excessive shallow bowl combined with single injection strategies can result in unacceptable soot emissions when trying to extend the RCCI concept up to high loads [25].…”

Section: Introductionmentioning

confidence: 82%

An assessment of the dual-mode reactivity controlled compression ignition/conventional diesel combustion capabilities in a EURO VI medium-duty diesel engine fueled with an intermediate ethanol-gasoline blend and biodiesel

Benajes

García

Monsalve‐Serrano

et al. 2016

Energy Conversion and Management

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a b s t r a c tThis work investigates the capabilities of the dual-mode reactivity controlled compression ignition/conventional diesel combustion engine operation to cover the full operating range of a EURO VI medium-duty diesel engine with compression ratio of 17.5:1. This concept is based on covering all the engine map switching between the reactivity controlled compression ignition and the conventional diesel combustion operating modes. Specifically, the benefits of reactivity controlled compression ignition combustion are exploited whenever possible according to certain restrictions, while the conventional diesel combustion operation is used to cover the zones of the engine map in which the reactivity controlled compression ignition operation is limited.The experiments were conducted using a single-cylinder research diesel engine derived from the multi-cylinder production engine. In addition, considering the mandatory presence of biofuels in the future context of road transport and the ability of ethanol to be blended with gasoline, the low reactivity fuel used in the study is a blend of 20% ethanol by volume with 80% of 95 octane number gasoline. Moreover, a diesel containing 7% of biodiesel has been used as high reactivity fuel. Firstly, a reactivity controlled compression ignition mapping is performed to check the operational limits of the concept in this engine platform. Later, based on the results, the potential of the dual-mode concept is discussed.Results suggest that, under the constraints imposed, reactivity controlled compression ignition combustion can be utilized between 25% and 35% load. In this region of the map, reactivity controlled compression ignition can provide up to 2% increased gross indicated efficiency than conventional diesel combustion, but led to lower efficiency at low engine speeds. In addition, it was demonstrated that the regeneration periods of the diesel particulate filter during dual-mode operation can be reduced more than twice, which entails a great reduction of the diesel fuel amount injected in the exhaust line.

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Section: Introductionmentioning

confidence: 82%

An assessment of the dual-mode reactivity controlled compression ignition/conventional diesel combustion capabilities in a EURO VI medium-duty diesel engine fueled with an intermediate ethanol-gasoline blend and biodiesel

Benajes

García

Monsalve‐Serrano

et al. 2016

Energy Conversion and Management

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“…include fuel ratio [14], injection strategy [15][16][17][18], EGR rate [19], compression ratio [16], bowl geometry [20,21], stability control, and utilization of two injectors.…”

Section: Improvement Trends For Internal Combustion Enginesmentioning

confidence: 99%

Reactivity Controlled Compression Ignition (RCCI) of Gasoline- CNG Mixtures

Firmansyah¹,

Aziz²,

Heikal³

et al. 2018

Improvement Trends for Internal Combustion Engines

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Reactivity controlled compression ignition (RCCI) is a dual fuel combustion method that relies on the significant difference in reactivity of the fuels involved. RCCI had a low performance at high engine speed due to its high tendency on knocking and high pressure rise rate. Therefore, this study investigates the effect of the fuel stratification on the RCCI combustion and its extended to the interaction of two low reactive fuels, gasoline and compressed natural gas (CNG), in the RCCI combustion system. The investigation was experimentally performed on a single cylinder engine and constant volume chamber. The stratification was created by varying injection timing in the engine by injecting CNG at 80 and 120 before top dead center (BTDC) and varying injection gap in the constant volume chamber with the gaps between two fuel injection timing were varied between 0 ms to 20 ms. The results in the engine experiment show that proportions of gasoline and CNG and degree of stratification of CNG were found to be effective means of combustion control within certain limits of engine load and HC and CO emissions could be significantly reduced. While in constant volume chamber it has a significant effect on the combustion phasing. Stratified mixture produces shorter combustion duration while homogeneous mixture produces longer duration.

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“…It has a port injector for low reactive fuel (LRF) and a direct injector for high reactive fuel (HRF) [14,51,56,[62][63][64][65][66]. Figure 5 shows the experimental setup for RCCI with port and direct injection (Dual fuel).…”

Section: Rcci With a Port And A Direct Injection (Dual Fuel)mentioning

confidence: 99%

Current trends on combustion control methods using fuel reactivities

Sankaralingam¹,

Venugopal²

2016

Int. J. Automot. Mech. Eng.

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Compression ignition (CI) engines are used in heavy duty engine applications due to their high torque capability and thermal efficiency. However, high NOx and smoke emissions are the challenges in using CI engines. Homogeneous charge compression ignition (HCCI) is one of the best methods to reduce NOx and smoke emissions. However, controlling the combustion for an entire range of operation in HCCI mode is a challenging task. Different methods like fast thermal management (FTM), exhaust gas recirculation (EGR), turbo charging and reactivity controlled compression ignition (RCCI) are reviewed and discussed in this article. RCCI is similar to HCCI, which uses reactivities of two different fuels to control combustion. The combustion objectives of HCCI such as less NOx and soot emission can also be obtained through this method. Combustion control based on reactivities of various fuels (RCCI) is discussed significantly. Fuels that have different reactivities can help to control the combustion phasing and thereby reducing the emission. Two different fuels can be injected together into the manifold or one fuel can be injected in the port and other in the combustion chamber directly for reactivity based combustion control. The technological development in different combustion control methods is reviewed and discussed in this article which is a useful knowledge base for further research investigations. When compared to other combustion control methods, RCCI is found to be advantageous in all perspectives such as cost, flexibility in control, simplicity and wide range of operation.

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An experimental investigation on the influence of piston bowl geometry on RCCI performance and emissions in a heavy-duty engine

Cited by 78 publications

References 43 publications

An assessment of the dual-mode reactivity controlled compression ignition/conventional diesel combustion capabilities in a EURO VI medium-duty diesel engine fueled with an intermediate ethanol-gasoline blend and biodiesel

An assessment of the dual-mode reactivity controlled compression ignition/conventional diesel combustion capabilities in a EURO VI medium-duty diesel engine fueled with an intermediate ethanol-gasoline blend and biodiesel

Reactivity Controlled Compression Ignition (RCCI) of Gasoline- CNG Mixtures

Current trends on combustion control methods using fuel reactivities

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