Investigation of the Combustion Instability-NOx Tradeoff in a Dual Fuel Reactivity Controlled Compression Ignition (RCCI) Engine

Klos, David T.; Janecek, Daniel; Kokjohn, Sage

doi:10.4271/2015-01-0841

Cited by 21 publications

(7 citation statements)

References 14 publications

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“…The solution adopted by the authors represents a hybrid set-up between a multi-cylinder engine and a research SCE [40]. This system allows operating an isolated cylinder as a SCE while the other three cylinders are governed by the stock ECU in order to equalize the cylinder-to-cylinder maximum load and pressure [41]. As a result, this hybrid SCE solution relies in a less cost effective option compared with the traditional research single cylinder engines and incorporates the advantage of enable the possibility to extend the scope of the study.…”

Section: Materials and Methods 21 Test Cell Characteristics And Engmentioning

confidence: 99%

Achieving clean and efficient engine operation up to full load by combining optimized RCCI and dual-fuel diesel-gasoline combustion strategies

Benajes

García

Monsalve‐Serrano

et al. 2017

Energy Conversion and Management

130

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Section: Materials and Methods 21 Test Cell Characteristics And Engmentioning

confidence: 99%

Achieving clean and efficient engine operation up to full load by combining optimized RCCI and dual-fuel diesel-gasoline combustion strategies

Benajes

García

Monsalve‐Serrano

et al. 2017

Energy Conversion and Management

130

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“…This engine configuration allows to study an isolated cylinder as conventional SCE engine, while the three remaining cylinders are governed using the OEM ECU to balance the cylinder-to-cylinder maximum pressure and load. Similar test cell configurations are found in [29,30]. This approach results in a much cheaper solution than the conventional SCEs used for research purposes, also allowing switching to the MCE version to broaden the spectrum of the study.…”

Section: Test Cell and Engine Descriptionmentioning

confidence: 62%

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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“…ensure the models are able to accurately capture combustion spanning this range, model validation was performed using CDC data from Curran et al, 37 RCCI data from Klos and Kokjohn, 38 and GCI data from Ra et al 36 The operating conditions for model validation are shown in Table 7. All model validation experiments used the same GM 1.9-L engine modeled in this work.…”

Section: Resultsmentioning

confidence: 99%

“…The adaptive dual fuel (ADF) injector enables operation in combustion regimes spanning from conventional diesel combustion (CDC), to dual-fuel reactivity controlled compression ignition (RCCI) combustion, to gasoline compression ignition (GCI) combustion. To ensure the models are able to accurately capture combustion spanning this range, model validation was performed using CDC data from Curran et al, 37 RCCI data from Klos and Kokjohn, 38 and GCI data from Ra et al 36 The operating conditions for model validation are shown in Table 7. All model validation experiments used the same GM 1.9-L engine modeled in this work.…”

Section: Model Validationmentioning

confidence: 99%

Blending the benefits of reactivity controlled compression ignition and gasoline compression ignition combustion using an adaptive fuel injection system

Kavuri

Kokjohn

Klos

et al. 2016

International Journal of Engine Research

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Computational optimizations of dual-fuel reactivity controlled compression ignition combustion and gasoline compression ignition combustion were performed using a novel adaptive dual-fuel injector capable of direct injecting both gasoline and diesel fuel in a single cycle. Optimization used the Engine Research Center KIVA code coupled with a multiobjective genetic algorithm. Model validation was performed by comparing simulation results to conventional diesel, reactivity controlled compression ignition, and gasoline compression ignition combustion, and the validated model was used to develop an optimum reactivity controlled compression ignition–gasoline compression ignition combustion strategy. The reactivity controlled compression ignition optimization results showed that by direct injecting gasoline and diesel fuel, the gasoline quantity can be held at a high percentage across the range of loads considered. In this study, the mode weighted gasoline percentage was 91%. At the lightest load point, direct injecting the gasoline gave optimum results, whereas for the other load points, premixing the gasoline yielded the optimum results. The optimized results were compared with conventional diesel combustion, and it was seen that reactivity controlled compression ignition combustion gives a cycle-averaged improvement of 33% in gross indicated efficiency over conventional diesel combustion. The cycle-averaged NOx and soot emissions were reduced by 95% and 75%, respectively. To demonstrate operation over the entire operating map, an optimization was performed at a high-speed–high-load (16 bar, 2500 r/min) condition. Optimization results showed that a gross indicated efficiency of 46.4% with near zero NOx and soot emissions could be achieved using gasoline compression ignition at this load point.

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Investigation of the Combustion Instability-NOx Tradeoff in a Dual Fuel Reactivity Controlled Compression Ignition (RCCI) Engine

Cited by 21 publications

References 14 publications

Achieving clean and efficient engine operation up to full load by combining optimized RCCI and dual-fuel diesel-gasoline combustion strategies

Achieving clean and efficient engine operation up to full load by combining optimized RCCI and dual-fuel diesel-gasoline combustion strategies

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

Blending the benefits of reactivity controlled compression ignition and gasoline compression ignition combustion using an adaptive fuel injection system

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