Characteristics of Diesel Combustion and Emissions with a Multi-injector System

Takeda, Yoshinaka; Niimura, Keiichi

doi:10.4271/952511

Cited by 15 publications

(4 citation statements)

References 3 publications

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“…Limited by the high-pressure common rail capability and the accuracy of the fuel injection control system, the performance improvement at large injection volume is limited. To shorten injection duration, make the most of the high temperature and high-pressure environment in the cylinder, and at the same time make full use of the cylinder space, the multi-injector system is proposed for fuel supply [11] . The system typically has a main injector located in the center of the cylinder head as in the conventional direct injection engine and one or two pilot injectors on the periphery of the cylinder head, as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

“…Compared to single injectors, multi-injector systems provide flexible control for the formation of incylinder mixtures. A heavy-duty engine [11,12] with a multi-injector system shows a reduction in fuel consumption and soot emissions. With additional pilot injections, the increased in-cylinder turbulence could improve air and main injection fuel mixing.…”

Section: Introductionmentioning

confidence: 99%

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Research on combustion process optimization of marine diesel engines based on dual-injector system

Liu,

Wang,

Liu

et al. 2024

J. Phys.: Conf. Ser.

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Marine diesel engines are widely used with their strong power and mature technology. However, in recent years, the emphasis on environmental protection has made combustion pollutants the focus of attention, and the new regulations of the International Maritime Organization (IMO) and various countries have put forward new requirements and challenges for diesel engine combustion and emission performance. Due to the large size and large amount of circulating fuel injection, the incomplete mixing of fuel in the cylinder and the local violent combustion of high-power medium-speed marine diesel engines are important reasons for low thermal efficiency and high pollutant emissions. To achieve efficient and clean combustion of fuel in the cylinder, a dual-injector combustion system is designed on a dual-fuel engine basis, aiming to add a micro-injection before the central injection and provide positive in-cylinder flow and hot atmosphere for the atomized combustion of the central-injection fuel, so that the combustion in the cylinder is reasonably arranged, the thermal efficiency is improved and NOx emissions are reduced. The 3D simulation model was established by CFD software CONVERGE, and the physical model was calibrated according to the data of the pure diesel mode of the dual-fuel engine, and the influence of the small pilot-injection fuel volume on the development of spray and combustion in the cylinder at high and low load was analyzed. It was found that the small pilot-injection fuel volume at a high load had little effect on the atomization evaporation of the main-injection fuel and the hot atmosphere in the cylinder, so the improvement effect of combustion quality was not obvious, while the pilot-injection volume with the same pilot-injection capacity as high load relatively accounted for a large proportion at the low load with a small cycle injection volume. Without changing the injector specification settings of the original dual-fuel engine, the thermal efficiency was increased by 6.13% and the NOx generation was reduced by 22.42% by optimizing the injection timing, injection duration, and injection amount.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on combustion process optimization of marine diesel engines based on dual-injector system

Liu,

Wang,

Liu

et al. 2024

J. Phys.: Conf. Ser.

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“…On the other hand, to find active method of spray control using fuel design, Senda et al 4) are conducting a study on trade-off between NOx and PM through injection of mixed fuel(fuel + CO 2 ). Also in case of multi-stage diesel combustion( MULDIC) 5) using multiple injection nozzles, the improvement in the fuel ratio and PM is being promoted while maintaining low NOx by freely controlling the spatial and the temporal distribution of fuel injected to the combustion chamber. In addition, the spray-control study with premixed lean diesel combustion system(PREDIC) was conducted in the field of uniform mixture formed by early injection of fuel 6) .…”

Section: Introductionmentioning

confidence: 99%

Application of PIV technique to spray behavior characteristics study in evaporative field

Yeom¹

2011

Journal of the Korea Society For Power System Engineering

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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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Characteristics of Diesel Combustion and Emissions with a Multi-injector System

Cited by 15 publications

References 3 publications

Research on combustion process optimization of marine diesel engines based on dual-injector system

Research on combustion process optimization of marine diesel engines based on dual-injector system

Application of PIV technique to spray behavior characteristics study in evaporative field

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

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