Effects of spray impingement, injection parameters, and EGR on the combustion and emission characteristics of a PCCI diesel engine

Kiplimo, Robert; Tomita, Eiji; Kawahara, Nobuyuki; Yokobe, Sumito

doi:10.1016/j.applthermaleng.2011.11.011

Cited by 216 publications

(86 citation statements)

References 25 publications

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“…Air-fuel mixing, evaporation and combustion processes control is the key to reduce pollutants and improve the efficiency of direct injection Diesel engines [1], [2]. Since decades, engine researchers have been trying to understand the basis of these processes from different points of view: theoretical, experimental and computational.…”

Section: Introductionmentioning

confidence: 99%

Experimental characterization of diesel ignition and lift-off length using a single-hole ECN injector

Benajes

Payri

Bardi

et al. 2013

Applied Thermal Engineering

150

126

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Section: Introductionmentioning

confidence: 99%

Experimental characterization of diesel ignition and lift-off length using a single-hole ECN injector

Benajes

Payri

Bardi

et al. 2013

Applied Thermal Engineering

150

126

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“…Fuel-air mixing plays a significant role in combustion and emission process in diesel engine, which can be controlled by different injection parameters [1], injection strategies [2], advanced combustion modes [3] or fuel blending [4]. The complexity of the phenomena characterizing this process brought a significant challenge to the research community boosting the investigations in this field: experimental and computational tools have been significantly developed along the last decade and important goals have been achieved.…”

Section: Introductionmentioning

confidence: 99%

“…Thanks to that, conceptual and numerical models have been developed to reproduce the whole Diesel injection process outlining the complex physical and chemical processes that occur behind the experimental observations [1] [8].…”

Section: Introductionmentioning

confidence: 99%

A study on diesel spray tip penetration and radial expansion under reacting conditions

Payri

García-Oliver

Xuan

et al. 2015

Applied Thermal Engineering

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The shape of Diesel spray was investigated at real engine conditions in a constant pressure combustion chamber. Schlieren imaging technique was used to make quantitative measurements of spray tip penetration and radial width stressing the impact that the fuel combustion and heat release have on the spray shape. The heat-release region and the Lift-off length were identified measuring OH* chemiluminescence. The fuel (n-dodecane) as well as the operating conditions and the injector used (single axially oriented hole, 89 µm-diameter) were chosen following the indications by the Engine Combustion Network. The effects of different operating parameters on the axial and radial expansion were also investigated. According to the results the reacting spray can be divided into three parts: an inert part a transient part and a quasi-steady part that lays between the previous regions. A new method for evaluating this radial expansion of reacting spray was developed and the parameter was evaluated under the different operating conditions. The results show that the radial expansion increases with increasing injection pressure and decreasing ambient temperature and ambient density. The oxygen concentration has no obvious effect on the radial expansion. AbstractThe shape of Diesel spray was investigated at real engine conditions in a constant pressure combustion chamber. Schlieren imaging technique was used to make quantitative measurements of spray tip penetration and radial width stressing the impact that the fuel combustion and heat release have on the spray shape. The heat-release region and the Lift-off length were identified measuring OH* chemiluminescence. The fuel (n-dodecane) as well as the operating conditions and the injector used (single axially-oriented hole, 89 µm-diameter) were chosen following the guidelines of the Engine Combustion Network. The effects of different operating parameters on the axial and radial expansion were also investigated. According to the results the reacting spray can be divided into three parts: an inert part, a transient one, and a quasi-steady one that lays between the two other regions. A new method for evaluating this radial expansion of reacting spray was developed, which was evaluated under the different operating conditions. Results show that the radial expansion increases with increasing injection pressure and decreasing ambient temperature and ambient density. The oxygen concentration has no obvious effect on the radial expansion.Keywords: tip penetration; radial expansion; reacting spray; Schlieren imaging Highlights:Spatial evolution of the reacting spray can be divided into three parts.The radial contour of the reacting spray is the result of shifting the inert one by an approximately constant value The radial expansion increases with higher injection pressure and lower ambient gas temperature.The radius expansion decreases with higher ambient gas density.Oxygen concentration has no significant effect on the radial expansion.

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“…The most relevant limitations consist of achieving an appropriate combustion phasing, cycle-to-cycle control of the combustion process, spray impingements and its effects on the emissions [7], combustion noise and operating range extent. Several techniques such as EGR [8], variable valve timing [9][10], variable compression ratio [11] and intake air temperature variation [12] have been investigated in order to overcome these drawbacks.…”

Section: Introductionmentioning

confidence: 99%

The role of the in-cylinder gas temperature and oxygen concentration over low load reactivity controlled compression ignition combustion efficiency

Desantes

Benajes

García

et al. 2014

Energy

101

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Several studies carried out with the aim of improving the RCCI concept in terms of thermal efficiency conclude that the main cause of the reduced efficiency at light loads is the reduced combustion efficiency. The present study used both a 3D computational model and engine experiments to explore the effect of the oxygen concentration and intake temperature on RCCI combustion efficiency at light load. The experiments were conducted using a single-cylinder heavy-duty research diesel engine adapted for dual fuel operation.Results suggest that it is possible to achieve an improvement of around 1.5% in the combustion efficiency with both strategies studied; the combined effect of intake temperature and in-cylinder fuel blending as well as the combined effect of oxygen concentration and incylinder fuel blending (ICFB). In addition, the direct comparison of both strategies suggests that the combustion losses trend is mainly associated to the in-cylinder equivalence ratio stratification, which is determined by the diesel to gasoline ratio in the blend since the injection timing is kept constant for all the tests. Moreover, the combined effect of the intake temperature and ICFB promotes a slight improvement in the combustion losses over the combined effect of the oxygen concentration and ICFB. KEYWORDS

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Effects of spray impingement, injection parameters, and EGR on the combustion and emission characteristics of a PCCI diesel engine

Cited by 216 publications

References 25 publications

Experimental characterization of diesel ignition and lift-off length using a single-hole ECN injector

Experimental characterization of diesel ignition and lift-off length using a single-hole ECN injector

A study on diesel spray tip penetration and radial expansion under reacting conditions

The role of the in-cylinder gas temperature and oxygen concentration over low load reactivity controlled compression ignition combustion efficiency

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