High EGR Diesel Combustion and Emission Reduction Study by Single Cylinder Engine

Misawa, Masahiro; Aoyagi, Yoshinobu; Kobayashi, Masayuki; Odaka, Matsuo; Goto, Yuichi

doi:10.1299/jsmemecjo.2004.3.0_139

Cited by 4 publications

(3 citation statements)

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“…High boost pressures, high exhaust gas recirculation (EGR) rates, and high fuel injection pressures are generally applied at various operating conditions in modern diesel engines, and precise control of the ignition delay is necessary to maintain high performance with low exhaust gas emissions under transient changes in these parameters. [1][2][3][4][5][6][7][8][9] Recently, the low temperature combustion (LTC) with a large quantity of EGR gas has been developed and practically applied. The low temperature combustion establishes both clean and efficient combustion while maintaining a specific ignition delay for premixing and the precise control of the ignition delay is essential.…”

Section: Introductionmentioning

confidence: 99%

Arrhenius type empirical ignition delay equations based on the phenomenology of in-cylinder conditions for wide operating ranges in modern diesel engines

Sakane

KANNO

Yurui

et al. 2023

International Journal of Engine Research

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Ignition delays were systematically measured in a DI diesel engine under wide ranging and various engine operating conditions, including engine speeds, fuel injection pressures, intake gas temperatures, intake gas pressures, and intake oxygen concentrations changed with EGR. Empirical equations to predict the ignition delay based on the Arrhenius equation with and without the Livengood-Wu integral and multiple regression analysis of the experimental results. The simple equation assuming constant conditions during the ignition delay without the Livengood-Wu integral can accurately predict the ignition delay. However, the lack of generality has remained as the fuel injection pressure is directly included in the Arrhenius equation which should contain only the chemical parameters. To improve the generality of the equation, the ignition delay was separated into the initial physical process of the fuel spray breakup and the following chemical process. The start of the Livengood-Wu integral was set at the breakup time of liquid fuel jet assuming that the chemical reactions do not occur before the fuel spray breakup, and that the physical factors are directly involved in the physical processes and indirectly in the chemical processes. The fuel spray tip dynamics based on Wakuri’s momentum theory was introduced to express the changes in the conditions in the fuel spray during the ignition delay. The ignition delay can be accurately predicted by the equation with the Livengood-Wu integral and six parameters, including the breakup time, the mass flow rates of air and fuel at the cross section of the spray tip, the oxygen partial pressure, the engine speed, and the averaged in-cylinder gas temperature. The empirical equation predicted longer ignition delays at high ignition pressure conditions, and the accuracy was improved by performing a multiple regression analysis separately at each fuel injection pressure, suggesting unknown factors varying with the fuel injection pressures.

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Section: Introductionmentioning

confidence: 99%

Arrhenius type empirical ignition delay equations based on the phenomenology of in-cylinder conditions for wide operating ranges in modern diesel engines

Sakane

KANNO

Yurui

et al. 2023

International Journal of Engine Research

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“…One way to increase the EGR rate under high loads is to apply a high boost pressure [1,2]. The greater air charge at high boost pressures under high EGR conditions reduces the soot emissions caused by the high EGR rate, while keeping NO x emissions low.…”

Section: Introductionmentioning

confidence: 99%

“…The greater air charge at high boost pressures under high EGR conditions reduces the soot emissions caused by the high EGR rate, while keeping NO x emissions low. Misawa et al [1] reported that an approach based on high-pressure charging, a high EGR rate, and highpressure injection has the potential to achieve the simultaneous reduction of NO x and soot emissions. Further, Wakisaka et al [2] investigated the detailed mechanism of this approach by means of in-cylinder flame visualization and a three-dimensional (3D)-*Corresponding author: Toyota Central R&D Laboratorie Inc., Nagakute, Aichi 480-1192, Japan.…”

Section: Introductionmentioning

confidence: 99%

In-cylinder stratification of external exhaust gas recirculation for controlling diesel combustion

Fuyuto

Nagata

Hotta

et al. 2009

International Journal of Engine Research

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A technique for achieving the in-cylinder stratification of external exhaust gas recirculation (EGR) gas in direct-injection (DI) diesel engines has been developed to reduce toxic exhaust emissions. The external EGR gas is supplied from one of the two intake ports which can create a swirl flow in either the upper or lower portion of the cylinder during the intake stroke. In the final stage of the compression stroke, a squish flow conveys the vertically stratified EGR gas into the piston cavity, generating a radially stratified EGR gas in the piston cavity at the end of the compression stroke. This strategy for achieving EGR gas stratification in the piston cavity was developed by using an unsteady computational fluid dynamics (CFD) code. Prior to the exhaust emission tests, the accuracy of the simulation was evaluated by planer laser-induced fluorescence (LIF) imaging. The exhaust emission tests showed that there was less smoke emission under medium load conditions when the EGR gas was delivered to the inner part of the piston cavity. The mechanism of this smoke reduction was investigated using CFD simulation, which is based on a series of calculations related to the internal flow of the injector nozzle, the in-cylinder fuel spray, and mixture formation and combustion. It has been shown that, at the beginning of the combustion, the higher concentration of EGR gas in the inner part of the cavity lowers the combustion temperature and reduces the soot formation rate. Air, which exists in the outer part of the cavity at the start of fuel injection, enhances the oxidation of the soot cloud in the piston cavity periphery in the latter half of the combustion period.

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The Effect of Multiple Injection on High Boosted and Wide Range EGR Diesel Combustion in a Single Cylinder Engine

Yamaguchi¹,

Aoyagi²,

Fujino³

et al. 2009

Trans.JSME, Ser.B

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High EGR Diesel Combustion and Emission Reduction Study by Single Cylinder Engine

Cited by 4 publications

References 0 publications

Arrhenius type empirical ignition delay equations based on the phenomenology of in-cylinder conditions for wide operating ranges in modern diesel engines

Arrhenius type empirical ignition delay equations based on the phenomenology of in-cylinder conditions for wide operating ranges in modern diesel engines

In-cylinder stratification of external exhaust gas recirculation for controlling diesel combustion

The Effect of Multiple Injection on High Boosted and Wide Range EGR Diesel Combustion in a Single Cylinder Engine

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