A New Concept for High Efficiency and Clean Diesel Combustion by Controlling Mixture Distribution  with Dual Zone Combustion Chamber

KIM, Sangkyu; LI, Kuichun; Matsuo, Takeru; Kanzaki, Jun; SHIMO, Daisuke

doi:10.1299/jmsesdm.2022.10.b2-1

Cited by 4 publications

(4 citation statements)

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“…On the other hand, the fuel elements close to the spray outline move slowly. The residence time of the fuel elements after passing through the nozzle at (x, r) = (30,4) is longer than 0.5 ms.…”

Section: Contours Of Equivalence Ratio and Residence Time Of Fuel Ele...mentioning

confidence: 98%

“…Recently, the PCCI operating range has been extended to medium loads through the application of multiple injection strategies. 29,30 High combustion noise, which is one of the problems of PCCI, can be reduced with new techniques such as ''noise-canceling spike 31,32 .'' Therefore, the applicable engine conditions for the axis-symmetric diesel spray flame model, that is, higher than medium loads, are sufficient to enable the development of new nozzle orifice shapes.…”

Section: Applicable Engine Conditions For Axis-symmetric Diesel Spray...mentioning

confidence: 99%

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Axis-symmetric diesel spray flame model coupled with momentum flux distribution measurement and improved soot phi-T map

Fuyuto

Mandokoro

Tagita

et al. 2023

International Journal of Engine Research

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An axis-symmetrical diesel spray flame model coupled with momentum flux distribution measurement was developed as a tool for nozzle orifice development. Momentum flux distributions at several distances from the nozzle orifice exit are measured by a force sensor with a small-diameter aperture which traverses a cross-section. A theoretical momentum flux profile is determined by fitting with the measured momentum flux profile at the cross-section. The spray velocity profile and equivalence ratio profiles are quantified from the theoretical momentum flux profile. By interpolating the profiles of the measured cross-sections, the axis-symmetrical diesel spray flame model can calculate the equivalence ratio and other physical values as a function of the distance from the nozzle exit ( x) and the radius from the spray axis ( r). The equivalence ratio distribution in a cross-section involving the spray axis is converted into soot formation and oxidation distribution by coupling with the improved soot ϕ -T map. The conventional soot-NOx ϕ -T map did not show the borderline between the soot formation and oxidation. To quantify the residence time of the fuel element during soot formation, the narrow soot peninsula was expanded up to its maximum by replacing the soot yield with the soot particle diameter. Instead of contour lines for the of NO mole fraction, contour lines for the OH mole fraction were implemented to reveal the border between soot formation and soot oxidation on the ϕ -T map. The borderline appears clearly, consisting of a horizontal line in the lower-temperature region and a rising line in the higher-temperature region. The converted soot formation and oxidation regions in the axis-symmetric spray flame model exhibit a strong correlation with the measured soot distributions in a quasi-steady diesel spray flame. The shear-stress, which induces turbulence affecting soot formation/oxidation, is also quantified from the velocity distribution.

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Section: Contours Of Equivalence Ratio and Residence Time Of Fuel Ele...mentioning

confidence: 98%

Section: Applicable Engine Conditions For Axis-symmetric Diesel Spray...mentioning

confidence: 99%

Axis-symmetric diesel spray flame model coupled with momentum flux distribution measurement and improved soot phi-T map

Fuyuto

Mandokoro

Tagita

et al. 2023

International Journal of Engine Research

View full text Add to dashboard Cite

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“…Kim et al 7 have proposed a new concept of diesel combustion with a dual zone combustion chamber. The authors call this concept ''Distribution Controlled partially Premixed Compression Ignition (DCPCI).''…”

Section: Compression Ignition Enginesmentioning

confidence: 99%

Special issue on COMODIA 2022

Ogawa,

Moriyoshi,

Kawanabe

2023

International Journal of Engine Research

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“…[46][47][48] Kim et al has proposed a new combustion concept, called distribution controlled partially premixed compression ignition (DCPCI) with a newly developed dual zone combustion chamber for suppressing the interaction between the burned gas produced by the earlier stage injection and the subsequent spray. 49 This DCPCI has established highly efficient and clean combustion by suppressing the interaction between the burned gas produced by the earlier stage injection and the subsequent spray by a dual-zone combustion chamber and multi-stage injection.…”

Section: Introductionmentioning

confidence: 99%

Improvement of diesel combustion with suppression of mutual fuel spray flame interactions with staggered nozzle hole arrangement and a spatially divided combustion chamber

Ogawa,

Mori,

Ishikawa

et al. 2023

International Journal of Engine Research

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A combination of a fuel injector with staggered nozzle hole arrangement with a combustion chamber divided into upper and lower layers by placing a lip at the middle of the side wall is proposed to improve diesel combustion with suppression of interactions among fuel spray flames. The fuel injector has twelve alternately arranged spray holes ( ϕ0.09 mm), staggered at two injection angles, 79° and 55° from the central axis of the injector. Two ordinary injectors with eight ( ϕ0.113 mm) and twelve ( ϕ0.092 mm) holes with an injection angle of 78° from the central axis with a conventional re-entrant combustion chamber were also examined as references. The experimental results showed that the improvements in thermal efficiencies and the reduction in smoke emissions can be established over a wide IMEP range with the proposed combination of the staggered nozzle hole injector and the divided combustion chamber. The exhaust loss is reduced with the combination of the injector and the combustion chamber while the cooling loss increases slightly. The rate of heat release from the combination of the injector and the combustion chamber has a more active main combustion and smaller afterburning than conventional systems. The three-dimensional CFD simulations showed that the combination of the injector and the combustion chamber can efficiently suppress the interactions among fuel spray flames at the combustion chamber wall after the impingement of fuel spray flames and also suitably distribute the fuel mixture, resulting in reductions in the afterburning and the smoke emissions. The slight increase in cooling loss with the proposed combination may be due to the increase in contact area of hot burned gas on the cylinder head; further improvements in thermal efficiency can be expected with optimization of the design factors related to the fuel injection and the combustion chamber configuration.

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A New Concept for High Efficiency and Clean Diesel Combustion by Controlling Mixture Distribution with Dual Zone Combustion Chamber

Cited by 4 publications

References 0 publications

Axis-symmetric diesel spray flame model coupled with momentum flux distribution measurement and improved soot phi-T map

Axis-symmetric diesel spray flame model coupled with momentum flux distribution measurement and improved soot phi-T map

Special issue on COMODIA 2022

Improvement of diesel combustion with suppression of mutual fuel spray flame interactions with staggered nozzle hole arrangement and a spatially divided combustion chamber

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