DE3-2: A Study on Effect of Heterogeneity of Oxygen Concentration and Temperature Distributions in a Combustion Chamber on Combustion and Emissions of Diesel Engine(DE: Diesel Engine Combustion,General Session Papers)

Tsuda, Satoshi; Kosaka, Hidenori; Aizawa, Tetsuya

doi:10.1299/jmsesdm.2008.7.189

Cited by 5 publications

(6 citation statements)

References 5 publications

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“…Tsuda et al [13] investigated the effect of the heterogeneity of the temperature distribution on the soot and NO x emissions of a diesel flame by using their rapid compression machine, and reported that the NO x and soot emissions from the diesel combustion are governed mainly by the amount of enthalpy entrained into the spray upstream of the ignition region. Their results led the current authors to expect that a simultaneous reduction in the NO x and particulate matter (PM) emissions will be achieved if the heterogeneity of the temperature distribution can be controlled.…”

Section: Possibility Of Controlling the Temperature Stratificationmentioning

confidence: 99%

“…As a basic study, Kosaka et al [12,13] investigated the effect of the heterogeneity of oxygen and temperature distribution on the soot and NO x emissions of a diesel flame by using a rapidcompression machine. In their study, mixtures with different oxygen concentrations and temperatures were injected through the intake ports located on the cylinder wall to create a heterogeneous distribution of oxygen and temperature in the combustion chamber.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Possibility Of Controlling the Temperature Stratificationmentioning

confidence: 99%

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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“…In this study, the authors chose to adopt this term. Even though many researchers have investigated the detailed mechanism that dominates the set-off length, 11,16 it has not yet been fully elucidated. 15,17 Pickett et al 18 proposed an empirical equation based on measurements of a single free-spray flame in a constant-volume vessel L = C Á T À3:74 a Á r À0:85 a Á d 0: 34…”

Section: Introductionmentioning

confidence: 99%

“…13–15 Arai 15 and Fujimoto proposed that the length L be referred to as the “set-off length.” In this study, the authors chose to adopt this term. Even though many researchers have investigated the detailed mechanism that dominates the set-off length, 11,16 it has not yet been fully elucidated. 15,17…”

Section: Introductionmentioning

confidence: 99%

Set-off length reduction by backward flow of hot burned gas surrounding high-pressure diesel spray flame from multi-hole nozzle

Fuyuto

Hattori

Yamashita

et al. 2016

International Journal of Engine Research

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The backward flow of the hot burned gas surrounding a diesel flame was found to be one of the factors reducing the set-off length (also called the lift-off length), that is, the distance from a nozzle exit into which a diffusion flame cannot intrude. In the combustion chamber of an actual diesel engine, the entrainment of the surrounding gas into a spray jet injected from a multi-hole nozzle is restricted by the combustion chamber walls and the adjacent spray jets, thus inducing the backward flow of the surrounding gas toward the nozzle exit. The emergence of this backward flow was measured by particle tracking velocimetry in the non-combusting condition. A new momentum theory for calculating the backward flow velocity was established by extending Wakuri's momentum theory. Shadowgraph imaging in an optical engine successfully visualized the backward flow of the hot burned gas. The hot burned gas is re-entrained into the spray jet in the region of the set-off position and shortens the set-off length in comparison to that of a single free-spray flame which does not induce the backward flow.

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“…Nevertheless, the light duty passenger cars and heavy duty vehicles are still needed and applicable of diesel engines. In addition, the agricultural and industrial sectors are also used diesel engines widely [1][2][3][4][5][6][7]. Therefore, the challenge for the diesel engine today is to reduce raw emission such as Nitrogen Oxide (NO x ), Particular Matter (PM).…”

Section: Introductionmentioning

confidence: 99%

Modeling of Common Rail System and Constant Volume Chamber in Biodiesel Combustion: A Review

Ramsy

Khalid

Jaat

2015

AMM

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ABSTRACT. Among the challenges faced by diesel engines combustion nowadays are to reduce emission especially Nitrogen Oxide (NO x ) and Particular Matter (PM) while enhancing fuel efficiency and power. The purpose of this review is to explore the mixture formation of biodiesel combustion using constant volume chamber and optical visualization. This paper will review the development of a single-shot combustion system and constant volume chamber. An overview of the relation of mixture formation and combustion process in diesel combustion is provided first. This review has shown that the application of Rapid compression Machine (RCM) is used to simulate actual condition especially the injection pressure and air motion. The review also found that the mixing between fuel and air is unavoidable and very important during ignition delay period thus predominantly influences the exhaust emission. The detailed behaviour of injection characteristic that strongly effects the mixture formation especially the spray evaporation and spray interference are discussed.

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DE3-2: A Study on Effect of Heterogeneity of Oxygen Concentration and Temperature Distributions in a Combustion Chamber on Combustion and Emissions of Diesel Engine(DE: Diesel Engine Combustion,General Session Papers)

Cited by 5 publications

References 5 publications

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

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

Set-off length reduction by backward flow of hot burned gas surrounding high-pressure diesel spray flame from multi-hole nozzle

Modeling of Common Rail System and Constant Volume Chamber in Biodiesel Combustion: A Review

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