Spray Break-Up Process of Diesel Fuel Investigated Close to the Nozzle

Fath, Ayatullah Muhammadin Al; Münch, K.-U.; Leipertz, Alfred

doi:10.1615/interjfluidmechres.v24.i1-3.250

Cited by 11 publications

(4 citation statements)

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“…The thickness of the investigated spray volume is limited in depth by the laser light sheet (thickness is <500 µm) and especially by the focal depth of the optics (80 µm). In the studies by Badock et al, 13 Fath et al, 26 Heimgärtner and Leipertz 27 and Schmitz et al, 28 the capability of this technique is shown for the identification of microscopic spray structures such as ligaments, clusters, cavities and liquid core. Limitations are unpredictable scattering properties due to multiple scattering at the rough stochastic interface of the spray, which might cause a milky haze in front of the observed plane.…”

Section: Methodsmentioning

confidence: 99%

Fuel property and fuel temperature effects on internal nozzle flow, atomization and cyclic spray fluctuations of a direct injection spark ignition–injector

Zigan

Shi

Krotow

et al. 2013

International Journal of Engine Research

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The effect of fuel properties and fuel temperature on the behaviour of the internal nozzle flow, atomization and cyclic spray fluctuations is examined for a three-hole direct injection spark ignition injector by combining numerical simulation of the nozzle flow with macroscopic and microscopic spray visualization techniques. A dominant influence of the liquid fuel viscosity on the highly unsteady, cavitating nozzle flow and spray formation was observed. A reduced viscosity (or larger Reynolds number) increases the flow velocity, turbulence and cavitation in the nozzle and leads to a slim spray with a reduced width but increased spray penetration. Furthermore, the spray cone angle is larger for lower Reynolds numbers due to the changed internal nozzle flow profile as predicted by the numerical calculation. The shot-to-shot fluctuations of the sprays were found to have their origin in the highly unsteady, cavitating nozzle flow. Larger cyclic spray fluctuations were observed at low Reynolds numbers although the predicted vapour formation in the nozzle is weaker. This can be explained by flow instabilities at low Reynolds numbers leading to large fluctuations in the nozzle flow.

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Section: Methodsmentioning

confidence: 99%

Fuel property and fuel temperature effects on internal nozzle flow, atomization and cyclic spray fluctuations of a direct injection spark ignition–injector

Zigan

Shi

Krotow

et al. 2013

International Journal of Engine Research

Self Cite

View full text Add to dashboard Cite

show abstract

“…In order to simulate the disintegration of the liquid jet, it is necessary to determine which is the driving process. Based on the experimental results of Fath et al [26], we assume that, within a distance of 400 µm from the nozzle exit, cavitation and turbulence are competing and atomization is driven by the process that presents the lower atomization characteristic time scale. Beyond that distance, the atomization is assumed to be controlled by turbulence only.…”

Section: Numerical Methodologymentioning

confidence: 99%

On Non-Equilibrium Turbulence Corrections in Multidimensional HSDI Diesel Engine Computations

Bianchi

Pelloni

Zhu

et al. 2001

SAE Technical Paper Series

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“…The cavitationinduced atomization submodel is based on a modified version of that proposed by Arcoumanis et al [32] and tries to give an estimation of the cavitation-induced atomization characteristic time. Based on the experimental results of Fath et al [33], it is assumed that, within a distance of 400 m from the nozzle exit, cavitation and turbulence are competing and atomization is driven by the process that presents the lower atomization characteristic time scale. Beyond that distance, the atomization is supposed to be controlled by turbulence only.…”

Section: Atomizationmentioning

confidence: 99%

Numerical Study Towards Smoke-Less and NOx-Less HSDI Diesel Engine Combustion

Bianchi¹,

Cazzoli²,

Pelloni³

et al. 2002

SAE Technical Paper Series

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This paper explores the possibility to extend the lowtemperature combustion concept developed for low load conditions to medium load conditions of HSDI DI Diesel engines. The aim is to understand which is the limit of conventional Diesel combustion towards smoke-lees and NOx-less conditions. The present research is based on numerical simulations performed by using the Kiva-3 code updated with physical sub-models. The combined influence of EGR cooling and EGR rate on combustion characteristics and emission formation is analyzed. Then, possible improvements to mixture formation are discussed with particularly emphasis on the use of multiple injection. The calculations show that smoke-less conditions by low-temperature combustion cannot be achieved at medium load and therefore a great role is played by mixture formation. Simulations have revealed that promoting leaner mixtures during spray combustion with further significant benefits on soot engine-out emissions is difficult to accomplish.

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Spray Break-Up Process of Diesel Fuel Investigated Close to the Nozzle

Cited by 11 publications

References 0 publications

Fuel property and fuel temperature effects on internal nozzle flow, atomization and cyclic spray fluctuations of a direct injection spark ignition–injector

Fuel property and fuel temperature effects on internal nozzle flow, atomization and cyclic spray fluctuations of a direct injection spark ignition–injector

On Non-Equilibrium Turbulence Corrections in Multidimensional HSDI Diesel Engine Computations

Numerical Study Towards Smoke-Less and NOx-Less HSDI Diesel Engine Combustion

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