The Influence of Hydro Grinding at VCO Nozzles on the Mixture Preparation in a DI Diesel Engine

Kampmann, Stefan; Dittus, B.; Mattes, Patrick; Kirner, M.

doi:10.4271/960867

Cited by 52 publications

(25 citation statements)

References 5 publications

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“…The momentum flux is a very important parameter, in spite of this there are very few study that uses this measure [5,6]. Important factors like spray penetration, spray cone angle and air entrainment depend largely on spray momentum [7].…”

Section: Introductionmentioning

confidence: 99%

Measurements of Spray Momentum for the Study of Cavitation in Diesel Injection Nozzles

Desantes

Payri

Salvador

2003

SAE Technical Paper Series

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In Diesel injection Systems, cavitation often appears in the injection nozzle holes. This paper analyses how cavitation affects the Diesel spray behavior. For this purpose two spray parameters, mass flux and momentum flux, have been measured at different pressure. We know that cavitation brings about the mass flux choke, but there are few studies about how the cavitation affects the momentum and the outlet velocity. The key of this study is just the measurement of the spray momentum under cavitation conditions.

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Section: Introductionmentioning

confidence: 99%

Measurements of Spray Momentum for the Study of Cavitation in Diesel Injection Nozzles

Desantes

Payri

Salvador

2003

SAE Technical Paper Series

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“…The nozzle geometry has an important influence on injection process and combustion development [24][25][26]. For this reason, the silicone methodology [27] has been employed to get information about the internal geometry of the nozzles used for this study.…”

Section: Internal Geometry Determinationmentioning

confidence: 99%

Influence of injector technology on injection and combustion development – Part 1: Hydraulic characterization

et al. 2011

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An experimental study of two real multi-hole Diesel injectors is performed under current DI Diesel engine operating conditions. The aim of the investigation is to study the influence of injector technology on the flow at the nozzle exit and to analyse its effect on the spray in evaporative conditions and combustion development. The injectors used are two of the most common technologies used nowadays: solenoid and piezoelectric. The nozzle for both injectors is very similar since the objective of the work is the understanding of the influence of the injector technology on spray characteristics for a given nozzle geometry. In the first part of the study, experimental measurements of hydraulic characterization have been analyzed for both systems. Analysis of spray behavior in evaporative conditions and combustion development will be carried out in the second part of the work. Important differences between both injectors have been observed, especially in their transient opening and closing of the needle, leading to a more efficient air-fuel mixing and combustion processes for the piezoelectric actuated injector.

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“…The analyses of injection system development have been presented from several viewpoints. Nozzle geometry has been studied for the influence on the internal flow and spray characteristics with respect to: atomization [4,5], mixing processes [6,7], emission [9,10] and cavitation [8,13]. Different injection strategies have been investigated to show the effect on pollutant emissions [2,3].…”

Section: Introductionmentioning

confidence: 99%

Fuel spray vapour distribution correlations for a high pressure diesel fuel spray cases for different injector nozzle geometries.

Njere

Emekwuru

2017

Proceedings ILASS–Europe 2017. 28th Conference on Liquid Atomization and Spray Systems

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The evolution of diesel fuel injection technology, to facilitate strong correlations of in-cylinder spray propagation with injection conditions and injector geometry, is crucial in facing emission challenges. More observations of spray propagation are, therefore, required to provide valuable information on how to ensure that all the injected fuel has maximum contact with the available air, to promote complete combustion and reduce emissions. In this study, high pressure diesel fuel sprays are injected into a constant-volume chamber at injection and ambient pressure values typical of current diesel engines. For these types of sprays the maximum fuel liquid phase penetration is different and reached sooner than the maximum fuel vapour phase penetration. Thus, the vapour fuel could reach the combustion chamber wall and could be convected and deflected by swirling air. In hot combustion chambers this impingement can be acceptable but this might be less so in larger combustion chambers with cold walls. The fuel-ambient mixture in vapourized fuel spray jets is essential to the efficient performance of these engines. For this work, the fuel vapour penetration values are presented for fuel injectors of different k-factors. The results indicate that the geometry of fuel injectors based on the k-factors appear to affect the vapour phase penetration more than the liquid phase penetration. This is a consequence of the effects of the injector types on the exit velocity of the fuel droplets. KeywordVapour, spray, k-factor, shadowgraph. IntroductionSpray formation occurs with the introduction of liquid into a gaseous environment through an orifice such that the liquid breaks-up into droplets by interacting with the surrounding gases and causing its own unsteadiness [3]. For diesel engines, spray characteristics (liquid/vapour penetration and distribution) significantly affect the combustion and emission processes. By optimizing these characteristics, the tailpipe emissions, mainly oxides of Nitrogen (NOx) and partciculate matter (PM), can be minimized [2]. Spray penetration, which is usually analysed macroscopically, considers the development of the liquid and vapour components. It is desirable to achieve optimal travel of these spray components to avoid the adverse effects of impingement caused by under/overpenetration of liquid spray [19,20]. Advances in fuel injection system, with the introduction of the common rail technology, have provided increased controllability of the injection event. The analyses of injection system development have been presented from several viewpoints. Nozzle geometry has been studied for the influence on the internal flow and spray characteristics with respect to: atomization [4,5], mixing processes [6,7], emission [9,10] and cavitation [8,13]. Different injection strategies have been investigated to show the effect on pollutant emissions [2,3]. Specific studies have also been conducted with conical and cylindrical nozzles [11,12], and to develop more understanding on the effects of nozzl...

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The Influence of Hydro Grinding at VCO Nozzles on the Mixture Preparation in a DI Diesel Engine

Cited by 52 publications

References 5 publications

Measurements of Spray Momentum for the Study of Cavitation in Diesel Injection Nozzles

Measurements of Spray Momentum for the Study of Cavitation in Diesel Injection Nozzles

Influence of injector technology on injection and combustion development – Part 1: Hydraulic characterization

Fuel spray vapour distribution correlations for a high pressure diesel fuel spray cases for different injector nozzle geometries.

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