Analysis of the combustion process, pollutant emissions and efficiency of an innovative 2-stroke HSDI engine designed for automotive applications

Benajes, Jesús; Lima, Daniela de Freitas; Tribotté, Pascal; Quechon, Nicolas; Obernesser, Philippe; Dugue, Vincent

doi:10.1016/j.applthermaleng.2013.03.050

Cited by 49 publications

(33 citation statements)

References 29 publications

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“…Previous research confirmed how the proposed architecture provides high flexibility on the air management parameters to substantially control the cylinder conditions and affect the combustion environment and final emissions levels in conventional diesel combustion [21]. Furthermore, HCCI diesel combustion was implemented and its potential for simultaneous reductions of NOX and soot emissions was successfully proven [22].…”

Section: Paper Draft: Implementation Of Partially Premixed Combustionmentioning

confidence: 63%

“…The valve overlap and ∆P are the two most important air management settings controlling the cylinder conditions, which are directly linked to the combustion process, the emissions formation and final engine efficiency; so it is highly recommended to perform a dedicated optimization of the air management settings to fully exploit the potential of the 2-stroke architecture [21].…”

Section: Implementation Of the Gasoline Ppc Conceptmentioning

confidence: 99%

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Implementation of the Partially Premixed Combustion concept in a 2-stroke HSDI diesel engine fueled with gasoline

2014

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Partially Premixed Combustion (PPC) of fuels in the gasoline octane range has proven to combine low NOX and soot emissions with high indicated efficiencies, while still retaining control over combustion phasing with the injection event. Previous research performed in four-stroke engines, has shown how the operating region where gasoline PPC concept can be successfully implemented is largely linked to the octane number of the fuel, making difficult to cover the entire load range with a fixed fuel.In this framework, 2-stroke engines arise as a promising solution to extend the load range of gasoline PPC concept, since it intrinsically provides equivalent torque response with only half the IMEP required in a 4-stroke cycle. Moreover, 2-stroke architecture provides high flexibility on the air management parameters to substantially control the cylinder conditions and affect the combustion environment, allowing proper combustion control even in low load conditions. An experimental investigation has been performed to evaluate the potential of the PPC concept for pollutant control, using a commercial gasoline with Research Octane Number of 95 in a newly-designed 2-stroke poppet valves automotive diesel engine. The experimental results confirm how it is possible to achieve stable gasoline PPC combustion at a low speed medium load point (1200 rpm, 5 bar IMEP); with good combustion stability (σIMEP below 3%), high combustion efficiency (over 98%), and low NOX and zero soot levels; thanks to the wide control of the cylinder gas temperature provided by the air management settings. Nevertheless, in agreement to the results reported in the literature, the indicated cycle efficiency attained at this low load operating condition is lower than the obtained in conventional diesel combustion conditions. Therefore, a dedicated optimization process of the engine hardware and engine settings is required to fully exploit the benefits of gasoline PPC concept in the investigated 2-stroke engine architecture.

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Section: Paper Draft: Implementation Of Partially Premixed Combustionmentioning

confidence: 63%

Section: Implementation Of the Gasoline Ppc Conceptmentioning

confidence: 99%

Implementation of the Partially Premixed Combustion concept in a 2-stroke HSDI diesel engine fueled with gasoline

2014

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“…Hence, the market pressure along with the increasing warning due to the effect of GHG emissions is pushing the researchers and manufacturers to search for more efficient engines with lower consumption and CO 2 emissions. The efforts are oriented to different issues such as thermal management [11][12][13][14], indicated cycle optimization [15][16][17], incylinder heat transfer (HT) reduction [18,19], friction and ancillaries losses reduction [20][21][22][23] or engine downsizing [24] between others.…”

Section: Introductionmentioning

confidence: 99%

A New Tool to Perform Global Energy Balances in DI Diesel Engines

Payri¹,

Olmeda²,

Martín³

et al. 2014

SAE Int. J. Engines

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The generalization of exhaust aftertreatment systems along with the growing awareness about climate change is leading to an increasing importance of the efficiency over other criteria during the design of reciprocating engines. Using experimental and theoretical tools to perform detailed global energy balance (GEB) of the engine is a key issue for assessing the potential of different strategies to reduce consumption. With the objective of improving the analysis of GEB, this paper describes a tool that allows calculating the detailed internal repartition of the fuel energy in DI Diesel engines. Starting from the instantaneous in-cylinder pressure, the tool is able to describe the different energy paths thanks to different submodels for all the relevant subsystems. Hence, the heat transfer from gases to engine walls is obtained with specific convective and radiative models in the chamber and ports; the repartition of the heat flux throughout the engine metal elements towards the oil and coolant is estimated with a lumped capacitance model; finally, the ancillary systems and friction losses are obtained through specific semiempirical submodels. The validation of the tool is performed in a 4-cylinder DI Diesel engine instrumented to perform detailed experimental GEB. Finally, a simple analysis of combined internal and external analysis in the complete engine map shows the effect of operating conditions on each energy term. Thus it is demonstrated the utility of the proposed tool, that complements the experimental heat flow measurements in Diesel engine researches oriented to the reduction of energy consumption.

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“…Thus, different strategies are proposed to achieve these objectives; thermal management improvement [1] [2], indicated cycle optimization [3][4], incylinder heat transfer (HT) reduction [5] [6], reduction of friction and auxiliaries losses [7][8], engine downsizing [9], new combustion concepts [10][11] among others. In the present work, the research effort has been focused on improving knowledge of incylinder heat transfer.…”

Section: Introductionmentioning

confidence: 99%

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

Benajes

Martín

García

et al. 2015

Energy Conversion and Management

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HIGHLIGHTSOptoelectronic pyrometer provides similar results compared with a conventional method Lower injection pressure results in higher radiation Higher ambient temperature and higher in-cylinder gas density produce higher radiation Larger lift-off length reduces the soot volume fraction and the spectral intensity An increase on swirl number, load and CA50 provide a lower total radiation Lower values of EGR implies a decreased on radiation intensity KEYWORDSSoot; in-cylinder heat transfer; radiation; Optical pyrometer; ABSTRACTThe efficiency and CO 2 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 losses in modern diesel engines. Considering previous studies, the portion of total chemical energy released during combustion lost due to radiation heat transfer varies widely from 0.5 up to 10%, depending on engine parameters and combustion process. Thus, the main objective of this work was to evaluate the amount of energy lost to soot radiation relative to the input fuel chemical energy during the combustion event under different operating conditions in a completely controlled environment provided by an optical engine. Under these simplified conditions, two-color method was applied by using high speed imaging pyrometer with cameras (two dimensional results) and optoelectronic pyrometer (zero dimensional results). Once a detailed comparison between both diagnostics was performed, optoelectronic pyrometer was used to characterize radiant energy losses in a fully instrumented 4-cylinder direct-injection light-duty diesel engine. In particular swirl ratio, EGR and combustion phasing effects on radiation heat transfer were evaluated.

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Analysis of the combustion process, pollutant emissions and efficiency of an innovative 2-stroke HSDI engine designed for automotive applications

Cited by 49 publications

References 29 publications

Implementation of the Partially Premixed Combustion concept in a 2-stroke HSDI diesel engine fueled with gasoline

Implementation of the Partially Premixed Combustion concept in a 2-stroke HSDI diesel engine fueled with gasoline

A New Tool to Perform Global Energy Balances in DI Diesel Engines

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

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