Approaches to Solve Problems of the Premixed Lean Diesel Combustion

Akagawa, Hisashi; Miyamoto, Takeshi; Harada, Akira; Sasaki, Satoru; Shimazaki, Naoki; Hashizume, Takumi; Tsujimura, Kinji

doi:10.4271/1999-01-0183

Cited by 193 publications

(80 citation statements)

References 6 publications

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“…The injection strategy is not simple: two injection pressures: 150 and 250 MPa, each injected quantity is controlled, and Predic uses two injection timings: an early injection: 80°BTDC (with side injectors) and a late injection: 40°BTDC (with centre injector), whereas Muldic adds a second stage injection with the centre injector (2°BTDC to 30°ATDC) [22][23][24][25][26][27][28][29].…”

Section: • Predic and Muldic Mean Premixed Lean And Multiple Stage DImentioning

confidence: 99%

Near Zero NOx Emissions and High Fuel Efficiency Diesel Engine: the Naditm Concept Using Dual Mode Combustion

Walter

Gatellier

2003

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Un moteur Diesel avec quasiment zéro émissions de NO x et un rendement élevé : le concept NADI TM utilisant deux modes de combustion -Grâce à leur bon rendement thermique et à leurs faibles émissions de dioxyde de carbone (CO 2 ), les moteurs Diesel verront leur part de marché dans les transports croître, à condition que leurs émissions d'oxydes d'azote (NO x ) et de particules soient réduites. Aujourd'hui, des systèmes de post-traitement adéquat des NO x et des particules sont en passe d'être industrialisés. Cependant, des inconvénients subsistent encore en termes de consommation de carburant, de fiabilité, de sensibilité au soufre présent dans le carburant et de coût lié à leurs stratégies de fonctionnement complexes et sophistiquées. De nouveaux procédés de combustion comme la combustion homogène de type HCCI (homogeneous charge compression ignition) sont actuellement à l'étude en raison de leur très fort potentiel à atteindre des émissions de NO x et de particules quasi nulles. Leurs principaux inconvénients sont des émissions d'hydrocarbures imbrûlés (HC) et de monoxyde de carbone (CO) trop élevées, un contrôle de la combustion difficile à forte charge et une puissance limitée. En réponse au défi que doit relever le moteur Diesel, l'IFP a développé un système de combustion capable d'atteindre des émissions de NO x et de particules quasiment nulles tout en conservant les standards de performances des moteurs Diesel actuels. Ce concept de moteur "bi-mode" appelé NADI TM (Narrow Angle Direct Injection) utilise la combustion homogène à charge partielle et bascule en combustion traditionnelle pour répondre aux exigences de pleine charge. En charges partielles (incluant les cycles MVEG européen et FTP américain), la combustion HCCI permet des émissions de NO x et de particules quasi nulles en maintenant un très bon rendement, proche d'un moteur Diesel Euro III. À 1500 et 2500 tr/min, le concept NADI TM atteint respectivement 0,6 et 0,9 MPa (6 et 9 bar) de pression moyenne indiquée (PMI) avec des émissions de NO x et de particules inférieures à 0,05 g/kWh. Cela représente respectivement 100 et 10 fois moins qu'un moteur Diesel traditionnel. À pleine charge, le système NADI TM est en phase avec les futurs standards de puissance au litre. À 4000 tr/min, 50 à 55 kW/l ont été atteints avec des conditions limites de fonctionnement et des réglages moteur conventionnels. L'utilisation de technologies moteur avancées comme la prochaine génération de systèmes d'injection common rail, les moteurs à distribution variable (VVA : variable valve actuation), les moteurs à taux de compression variable (VCR : variable compression ratio) ou les turbo-compresseurs assistés électri-quement sera très utile pour les futures étapes de développement du concept, qui sont bien identifiées. Oil & Gas Science and Technology -Rev. IFP, Vol. 58 (2003)

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Section: • Predic and Muldic Mean Premixed Lean And Multiple Stage DImentioning

confidence: 99%

Near Zero NOx Emissions and High Fuel Efficiency Diesel Engine: the Naditm Concept Using Dual Mode Combustion

Walter

Gatellier

2003

Oil & Gas Science and Technology - Rev. IFP

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“…Fluid mechanic codes, like KIVA, with relatively simplified chemical kinetic models have been used [56][57][58]. These models are generally limited in accuracy due to simplified chemical kinetics which do not give satisfactory results under all possible operating conditions.…”

Section: Simulation Studies On Cai Combustionmentioning

confidence: 99%

A Review of Experimental and Simulation Studies on Controlled Auto-Ignition Combustion

Milovanović¹,

Chen²

2001

SAE Technical Paper Series

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“…The automotive scientific community and manufacturers are currently focusing part of their efforts on the investigation of new combustion modes [1,2] and on the optimization of the current technology with the aim of reducing fuel consumption and emissions in CI diesel engines [3]. Most of these new combustion concepts are achieved by using different strategies that produce a lean air-fuel mixture together with a low temperature combustion.…”

Section: Introductionmentioning

confidence: 99%

Impact of Spark Assistance and Multiple Injections on Gasoline PPC Light Load

Benajes¹,

Tormos²,

García³

et al. 2014

SAE Int. J. Engines

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Along the last years, engine researchers are more and more focusing their efforts on the advanced low temperature combustion (LTC) concepts with the aim of achieving the stringent limits of the current emission legislations. In this regard, several studies based on highly premixed combustion concepts such as HCCI has been confirmed as a promising way to decrease drastically the most relevant CI diesel engineout emissions, NOx and soot. However, the major HCCI drawbacks are the narrow load range, bounded by either misfiring (low load, low speed) or hardware limitations (higher load, higher speeds) and the combustion control (cycle-tocylce control and combustion phasing). Although several techniques have been widely investigated in order to overcome these drawbacks, the high chemical reactivity of the diesel fuel remains as the main limitation for the combustion control.The attempts of the researchers to overcome these disadvantages are shifting to the use of fuels with different reactivity. In this sense, gasoline PPC has been able to reduce emissions and improve efficiency simultaneously, but some drawbacks regarding controllability and stability at low load operating conditions still need solution. In this field, previous researches have been demonstrate the multiple injection strategy as an appropriate technique to enhance the combustion stability. However, PPC combustion has been found limited to engine loads higher than 5 bar BMEP when using fuels with octane number greater than 90. In this regard, previous work from the authors showed the capability of the spark plug to provide combustion control in engine loads below this limit even using 98 ON gasoline.The main objective of the present work is to couple the control capability of the spark assistance together with an appropriate mixture distribution by using double injection strategies with the aim of evaluating performance and engine-out emissions at low load PPC range using a high octane number gasoline. For this purpose the optical and metal version of a compression ignition single-cylinder engine, to allow high compression ratio, has been used during the research. A common rail injection system enabling high injection pressures has been utilized to supply the 98 octane number gasoline. An analysis of the incylinder pressure signal derived parameters, hydroxyl radical (OH*) and natural luminosity images acquired from the transparent engine as well as a detailed analysis of the air/fuel mixing process by means of a 1-D in-house developed spray model (DICOM) has been conducted. Results from both analysis methods, suggest the spark assistance as a proper technique to improve the spatial and temporal control over the low load gasoline PPC combustion process. A noticeable increase in the cycle to cycle repeatability (5% versus 15.1% CoV IMEP at 2 bar load) as well as a reduction in the knocking level (20.5 versus 33.6 MW/m 2 at 7 bar load) is observed. In addition, the combination of the spark assistance with the use of the double injection strategy ...

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Approaches to Solve Problems of the Premixed Lean Diesel Combustion

Cited by 193 publications

References 6 publications

Near Zero NOx Emissions and High Fuel Efficiency Diesel Engine: the Naditm Concept Using Dual Mode Combustion

Near Zero NOx Emissions and High Fuel Efficiency Diesel Engine: the Naditm Concept Using Dual Mode Combustion

A Review of Experimental and Simulation Studies on Controlled Auto-Ignition Combustion

Impact of Spark Assistance and Multiple Injections on Gasoline PPC Light Load

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