Search results for: Jesús Benajes

Items from 1 to 20 out of 27 results

article

Fuel consumption and engine-out emissions estimations of a light-duty engine running in dual-mode RCCI/CDC with different fuels and driving cycles

Jesús Benajes, Antonio García, Javier Monsalve-Serrano, Rafael Lago Sari

Energy > 2018 > 157 > C > 19-30

This work compares the performance and emissions of two dual-mode combustion concepts over different driving cycles by means of vehicle systems simulations. The dual-mode concept relies on switching between the dual-fuel concept known as reactivity controlled compression ignition (RCCI) and conventional diesel combustion (CDC) to cover the whole engine map. The experimental RCCI maps obtained with...

article

Swirl ratio and post injection strategies to improve late cycle diffusion combustion in a light-duty diesel engine

Jesús Benajes, Jaime Martín, Antonio García, David Villalta, more

Applied Thermal Engineering > 2017 > 123 > C > 365-376

Nitrogen oxides (NOx) and soot emissions are the most important pollutants from direct-injection diesel engines. In particular, soot formation and oxidation determine the net engine-out soot emissions. These phenomena are complex and competing processes during diesel combustion. Despite many researches implicate the mechanisms of soot formation with soot emissions, the enhancement of the late cycle...

article

Gaseous emissions and particle size distribution of dual-mode dual-fuel diesel-gasoline concept from low to full load

Jesús Benajes, Antonio García, Javier Monsalve-Serrano, Vicente Boronat

Applied Thermal Engineering > 2017 > 120 > C > 138-149

Low temperature combustion concepts are in focus of study nowadays as a method to avoid the NOx-soot trade-off existing with conventional diesel combustion. One of the most promising strategy is known as reactivity controlled compression ignition because of its high thermal efficiency and the ultra-low nitrogen oxides and soot emissions. However, this concept presents several challenges such as the...

article

An investigation on the particulate number and size distributions over the whole engine map from an optimized combustion strategy combining RCCI and dual-fuel diesel-gasoline

Jesús Benajes, Antonio García, Javier Monsalve-Serrano, Vicente Boronat

Energy Conversion and Management > 2017 > 140 > C > 98-108

Literature demonstrates that, for premixed low temperature combustion concepts, particulate matter cannot be directly extrapolated from soot emissions measurements, as typically done for conventional diesel combustion. This is because the particulate matter from low temperature combustion has low fraction of carbonaceous compounds and great amount of soluble organic fraction, which is not captured...

article

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

Jesús Benajes, Antonio García, Javier Monsalve-Serrano, Vicente Boronat

Energy Conversion and Management > 2017 > 136 > C > 142-151

This experimental work investigates the capabilities of the reactivity controlled compression ignition combustion concept to be operated in the whole engine map and discusses its benefits when compared to conventional diesel combustion. The experiments were conducted using a single-cylinder medium-duty diesel engine fueled with regular gasoline and diesel fuels. The main modification on the stock...

article

Evaluation of swirl effect on the Global Energy Balance of a HSDI Diesel engine

Jesús Benajes, Pablo Olmeda, Jaime Martín, Diego Blanco-Cavero, more

Energy > 2017 > 122 > C > 168-181

In the last years, a growing interest about increasing engine efficiency has led to the development of new engine technologies. Since air motion in the chamber is a key issue in internal combustion engines to improve the air-fuel mixing process and achieve faster burning rates, modern Diesel engines are designed to generate gas vorticity (swirl) that lead to enhanced turbulence in the combustion chamber...

article

A RCCI operational limits assessment in a medium duty compression ignition engine using an adapted compression ratio

Jesús Benajes, José V. Pastor, Antonio García, Vicente Boronat

Energy Conversion and Management > 2016 > 126 > C > 497-508

Reactivity Controlled Compression Ignition concept offers an ultra-low nitrogen oxide and soot emissions with a high thermal efficiency. This work investigates the capabilities of this low temperature combustion concept to work on the whole map of a medium duty engine proposing strategies to solve its main challenges. In this sense, an extension to high loads of the concept without exceeding mechanical...

article

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

Jesús Benajes, Antonio García, Javier Monsalve-Serrano, Iyad Balloul, more

Energy Conversion and Management > 2016 > 123 > C > 381-391

This 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...

article

Effects of piston bowl geometry on Reactivity Controlled Compression Ignition heat transfer and combustion losses at different engine loads

Jesús Benajes, Antonio García, José Manuel Pastor, Javier Monsalve-Serrano

Energy > 2016 > 98 > C > 64-77

This work investigates the effects of the piston bowl geometry on RCCI (Reactivity Controlled Compression Ignition) heat transfer and combustion losses and its repercussion on the engine efficiency. For this purpose, three piston geometries with compression ratio 14.4:1 have been studied and compared by means of computational modeling. In addition, the engine operating conditions proposed at low,...

article

Optimization of the combustion system of a medium duty direct injection diesel engine by combining CFD modeling with experimental validation

Jesus Benajes, Ricardo Novella, Jose Manuel Pastor, Alberto Hernández-López, more

Energy Conversion and Management > 2016 > 110 > C > 212-229

The research in the field of internal combustion engines is currently driven by the needs of decreasing fuel consumption and CO₂ emissions, while fulfilling the increasingly stringent pollutant emissions regulations. In this framework, this research work focuses on describing a methodology for optimizing the combustion system of Compression Ignition (CI) engines, by combining Computational Fluid Dynamics...

article

In-cylinder soot radiation heat transfer in direct-injection diesel engines

Jesús Benajes, Jaime Martín, Antonio García, David Villalta, more

Energy Conversion and Management > 2015 > 106 > C > 414-427

The efficiency and CO₂ are one of the main concerns of automotive manufacturers. There are several strategies under investigation to solve this problem. In the present work, the research effort has been focused on improving knowledge of in-cylinder heat transfer and its impact on engine efficiency. In particular, soot radiation was studied since it can be considered a significant source of the efficiency...

article

The potential of RCCI concept to meet EURO VI NOx limitation and ultra-low soot emissions in a heavy-duty engine over the whole engine map

Jesús Benajes, José V. Pastor, Antonio García, Javier Monsalve-Serrano

Fuel > 2015 > 159 > C > 952-961

This work investigates the potential of RCCI concept to achieve ultra-low NOx and soot emissions over a wide range of engine speed and loads. For this purpose, a detailed experimental methodology has been defined and applied in a heavy-duty single-cylinder engine fueled with diesel and gasoline. In addition, to assess the influence of the engine compression ratio on RCCI capabilities two different...

article

Effects of low reactivity fuel characteristics and blending ratio on low load RCCI (reactivity controlled compression ignition) performance and emissions in a heavy-duty diesel engine

Jesús Benajes, Santiago Molina, Antonio García, Javier Monsalve-Serrano

Energy > 2015 > 90 > P2 > 1261-1271

This work investigates the effect of low reactivity fuel characteristics and blending ratio on low load RCCI (reactivity controlled compression ignition) performance and emissions using four different low reactivity fuels: E10-95, E10-98, E20-95 and E85 (port fuel injected) while keeping constant the same high reactivity fuel: diesel B7 (direct injected). The experiments were conducted using a heavy-duty...

article

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

Jesús Benajes, José V. Pastor, Antonio García, Javier Monsalve-Serrano

Energy Conversion and Management > 2015 > 103 > C > 1019-1030

This experimental work investigates the effects of piston bowl geometry on RCCI performance and emissions at low, medium and high engine loads. For this purpose three different piston bowl geometries with compression ratio 14.4:1 have been evaluated using single and double injection strategies. The experiments were conducted in a heavy-duty single-cylinder engine adapted for dual fuel operation. All...

article

Effects of direct injection timing and blending ratio on RCCI combustion with different low reactivity fuels

Jesús Benajes, Santiago Molina, Antonio García, Javier Monsalve-Serrano

Energy Conversion and Management > 2015 > 99 > Complete > 193-209

This work investigates the effects of the direct injection timing and blending ratio on RCCI performance and engine-out emissions at different engine loads using four low reactivity fuels: E10-95, E10-98, E20-95 and E85 (port fuel injected) and keeping constant the same high reactivity fuel: diesel B7 (direct injected). The experiments were conducted using a heavy-duty single-cylinder research diesel...

article

The role of the in-cylinder gas temperature and oxygen concentration over low load reactivity controlled compression ignition combustion efficiency

José M. Desantes, Jesús Benajes, Antonio García, Javier Monsalve-Serrano

Energy > 2014 > 78 > C > 854-868

Several studies carried out with the aim of improving the RCCI (reactivity controlled compression ignition) concept in terms of thermal efficiency conclude that the main cause of the reduced efficiency at light loads is the reduced combustion efficiency. The present study used both a 3D computational model and engine experiments to explore the effect of the oxygen concentration and intake temperature...

article

Performance and engine-out emissions evaluation of the double injection strategy applied to the gasoline partially premixed compression ignition spark assisted combustion concept

Jesús Benajes, Santiago Molina, Antonio García, Javier Monsalve-Serrano, more

Applied Energy > 2014 > 134 > Complete > 90-101

Spark assistance has been found to improve combustion control when combined with both single and double injection operation applied to compression ignition (CI) engines using gasoline as the fuel. Previous work has verified the potential of a double injection strategy when applied to the gasoline spark assisted partially premixed compression ignition combustion (PPC) concept. The current research...

article

A new methodology for uncertainties characterization in combustion diagnosis and thermodynamic modelling

Jesús Benajes, Pablo Olmeda, Jaime Martín, Ricardo Carreño

Applied Thermal Engineering > 2014 > 71 > 1 > 389-399

Combustion diagnosis based on in-cylinder pressure signals as well as 0D thermodynamic modelling, are widely used to study and optimize the combustion in reciprocating engines. Both approaches share some uncertainties regarding the sub-models and the experimental installation that, for the sake of accuracy, must be reduced as much as possible in order to obtain reliable results. A methodology, based...

article

Conceptual model description of the double injection strategy applied to the gasoline partially premixed compression ignition combustion concept with spark assistance

Jesús Benajes, Santiago Molina, Antonio García, Javier Monsalve-Serrano, more

Applied Energy > 2014 > 129 > Complete > 1-9

New combustion concepts applied to compression ignition engines are focused on achieve low temperature combustion together with a lean mixture distribution by allowing extra time from the end of injection to the start of combustion. Recently, the use of gasoline in a compression ignition engine under PPC conditions has been demonstrated as a suitable technique to achieve this extra mixing time, however...

article

Evaluation of massive exhaust gas recirculation and Miller cycle strategies for mixing-controlled low temperature combustion in a heavy duty diesel engine

Jesús Benajes, Santiago Molina, Ricardo Novella, Eduardo Belarte

Energy > 2014 > 71 > Complete > 355-366

The future of compression ignition engines depends on their ability for keeping their competitiveness in terms of fuel consumption compared to spark-ignition engines. In this competitive framework, the Low Temperature Combustion (LTC) concept is a promising alternative to decrease NOx and soot emissions. Thus, this research focuses on implementing the LTC concept, but keeping the conventional mixing-controlled...

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Keywords

REACTIVITY CONTROLLED COMPRESSION IGNITION (11)
EFFICIENCY (8)
DUAL-FUEL COMBUSTION (5)
EURO VI (4)
EURO VI EMISSIONS (4)
DIESEL ENGINE (3)
DUAL FUEL (3)
ENGINE EFFICIENCY (3)
ENGINE MAP (3)
HEAT TRANSFER (3)
HIGH OCTANE NUMBER GASOLINE (3)
LOW TEMPERATURE COMBUSTION (3)
MIXING PROCESS (3)
PARTIALLY PREMIXED COMBUSTION (3)
SPARK ASSISTANCE (3)
COMBUSTION (2)
COMBUSTION CONTROL (2)
DOUBLE INJECTION (2)
EMISSIONS CONTROL (2)
LOW LOAD (2)
2-STROKE ENGINE (1)
BIOFUELS (1)
CDC (CONVENTIONAL DIESEL COMBUSTION) (1)
CFD MODEL (1)
COMBUSTION DIAGNOSIS (1)
COMBUSTION EFFICIENCY (1)
COMMERCIAL FUELS (1)
COMPRESSION IGNITION ENGINES (1)
COMPRESSION RATIO (1)
COOL FLAMES (1)
DESCRIPTION WITH COMBUSTION IMAGES (1)
DIESEL COMBUSTION (1)
DIESEL INJECTION (1)
DIFFUSION-CONTROLLED COMBUSTION (1)
DRIVING CYCLES (1)
DUAL FUEL COMBUSTION EMISSIONS (1)
DUAL-MODE (1)
DUAL-MODE CONCEPT (1)
DUAL-MODE OPERATION (1)
ECN (1)
EMISSIONS (1)
ENGINE (1)
ENGINE OPTIMIZATION (1)
ENGINE-OUT EMISSIONS (1)
EURO VI LIMITS (1)
GLOBAL ENERGY BALANCE (1)
HEAT RELEASE (1)
HOT PULSATING FLOW (1)
IGNITION (1)
IN-CYLINDER FUEL BLENDING (1)
IN-CYLINDER HEAT TRANSFER (1)
INSTANTANEOUS PRESSURE MEASUREMENT (1)
INTAKE TEMPERATURE (1)
LIFT-OFF LENGTH (1)
LOW REACTIVITY FUELS (1)
MILLER CYCLE (1)
NATURAL LUMINOSITY AND OH IMAGES (1)
OPTICAL PYROMETER (1)
OXYGEN CONCENTRATION (1)
PARTICLE (1)
PARTICLE MATTER (1)
PERFORMANCE AND ENGINE-OUT EMISSIONS (1)
PIEZORESISTIVE SENSOR (1)
POLLUTANT EMISSIONS (1)
PREMIXED (1)
PRESSURE MODELLING (1)
RADIATION (1)
RCCI (1)
RCCI (REACTIVITY CONTROLLED COMPRESSION IGNITION) (1)
SCHLIEREN (1)
SOOT (1)
SOOT EMISSIONS (1)
SOOT OXIDATION PROCESS (1)
SPLIT OF LOSSES (1)
SWIRL (1)
THERMODYNAMIC MODELLING (1)
UNCERTAINTIES ADJUSTMENT (1)
more

INFONA - science communication portal

Search results for: Jesús Benajes

Fuel consumption and engine-out emissions estimations of a light-duty engine running in dual-mode RCCI/CDC with different fuels and driving cycles

Swirl ratio and post injection strategies to improve late cycle diffusion combustion in a light-duty diesel engine

Gaseous emissions and particle size distribution of dual-mode dual-fuel diesel-gasoline concept from low to full load

An investigation on the particulate number and size distributions over the whole engine map from an optimized combustion strategy combining RCCI and dual-fuel diesel-gasoline

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

Evaluation of swirl effect on the Global Energy Balance of a HSDI Diesel engine

A RCCI operational limits assessment in a medium duty compression ignition engine using an adapted compression ratio

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

Effects of piston bowl geometry on Reactivity Controlled Compression Ignition heat transfer and combustion losses at different engine loads

Optimization of the combustion system of a medium duty direct injection diesel engine by combining CFD modeling with experimental validation

In-cylinder soot radiation heat transfer in direct-injection diesel engines

The potential of RCCI concept to meet EURO VI NOx limitation and ultra-low soot emissions in a heavy-duty engine over the whole engine map

Effects of low reactivity fuel characteristics and blending ratio on low load RCCI (reactivity controlled compression ignition) performance and emissions in a heavy-duty diesel engine

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

Effects of direct injection timing and blending ratio on RCCI combustion with different low reactivity fuels

The role of the in-cylinder gas temperature and oxygen concentration over low load reactivity controlled compression ignition combustion efficiency

Performance and engine-out emissions evaluation of the double injection strategy applied to the gasoline partially premixed compression ignition spark assisted combustion concept

A new methodology for uncertainties characterization in combustion diagnosis and thermodynamic modelling

Conceptual model description of the double injection strategy applied to the gasoline partially premixed compression ignition combustion concept with spark assistance

Evaluation of massive exhaust gas recirculation and Miller cycle strategies for mixing-controlled low temperature combustion in a heavy duty diesel engine

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