Validation of Diesel Fuel Spray and Mixture Formation from Nozzle Internal Flow Calculation

Masuda, Ryo; Fuyuto, Takayuki; Nagaoka, Makoto; Berg, Eberhard von; Tatschl, Reinhard

doi:10.4271/2005-01-2098

Cited by 29 publications

(16 citation statements)

References 7 publications

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“…There is some asymmetry in the cavitation pattern, especially after the evacuation is observed. This could probably be attributed to numerical differences caused by either CAD imperfections or by some inherent asymmetry of the nozzle grid [27]. However, it only occurs when the cavitation level is low and does not affect significantly the solution.…”

Section: Needle Motion Influence On Flow Patternmentioning

confidence: 99%

CFD Study of Needle Motion Influence on the Spray Conditions of Single-Hole Injectors

Margot

Hoyas

Fajardo³

et al. 2011

Atomiz Spr

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The spray characteristics and consequently the success of the diesel combustion process is strongly affected by the manner in which fuel is introduced in the combustion chamber. This work consists in studying the effect of needle motion of typical single-hole sac-type injectors on nozzle exit conditions. Three-dimensional moving mesh simulations have been carried out to calculate the injection process using cylindrical and conical nozzle geometries. The CFD analysis includes a study of the effect of cavitation on kinetic turbulent energy and velocity profiles. Results show that the flow within the nozzle and at the exit varies depending on the nozzle geometry and needle position. The model predicts clouds of cavitation that grow and exit the nozzle at low needle lifts. A kind of hysteresis in the development of the flow has also been observed between needle opening and closing. The existing correlation between turbulence and cavitation at the nozzle hole exit during the needle motion has been quantified.

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Section: Needle Motion Influence On Flow Patternmentioning

confidence: 99%

CFD Study of Needle Motion Influence on the Spray Conditions of Single-Hole Injectors

Margot

Hoyas

Fajardo³

et al. 2011

Atomiz Spr

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show abstract

“…Massuda et al [13] published in 2003 a computational work performed in a diesel VCO multi-hole nozzle, modelling the internal flow with AVL-FIRE [14]. In this study, Massuda et al analysed in detail the transitory behaviour of the cavitation during the opening and closing phases, and investigated the vortex development in the discharge orifices.…”

Section: Introductionmentioning

confidence: 99%

Large-eddy simulation analysis of the influence of the needle lift on the cavitation in diesel injector nozzles

Desantes

Salvador

Carreres

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part D:

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Cavitation phenomenon has a strong influence on the internal flow and spray development in diesel injector nozzles. Despite its importance, there are lots of aspects which remain still unclear, especially at partial needle lifts when the injector is in the opening and closing phases. For that reason, the current paper is focused on the influence of the needle lift on the internal flow in a diesel nozzle. This study has been carried out with 3D simulations at high injection pressure (160 MPa) using a homogeneous equilibrium model implemented in OpenFOAM to model cavitation phenomenon.The nozzle has been simulated with LES methods at six different needle lifts (10, 30, 50, 75, 100 and 250 μm), providing relevant information about the evolution of the internal flow, the turbulence development (vorticity, turbulence-cavitation interaction and turbulent structures) and the flow characteristics in the nozzle outlet (mass flow, momentum flux and effective velocity) with the needle position.

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“…This vortex flow inside the sac can be stronger at lower needle lifts due to narrower flow passage and smaller sac volume [12][13][14][15]. A considerable amount of research has studied the vortex flow and 3 related cavitation phenomenon inside multi-hole diesel injectors and their effects on emerging flow pattern using the optically accessible large-scale nozzles or by numerical simulation [13][14][15][16][17][18]. It was found that the vortex flow is formed inside the nozzle at low needle lifts, which induces turbulent emerging flow patterns of the multi-hole diesel injectors with a faster breakup.…”

Section: Introductionmentioning

confidence: 99%

Effect of the number and position of nozzle holes on in- and near-nozzle dynamic characteristics of diesel injection

Moon

Gao

Park

et al. 2015

Fuel

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Despite the fact that all modern diesel engines use multi-hole injectors, single-hole injectors are frequently used to understand the fundamental properties of high-pressure diesel injections due to their axisymmetric design of the injector nozzles. A multi-hole injector accommodates many holes around the nozzle axis to deliver adequate amount of fuel with small orifices. The off-axis arrangement of the multi-hole injectors significantly alters the inter-and near-nozzle flow patterns compared to those of the single-hole injectors. This study compares the transient needle motion and near-nozzle flow characteristics of the single-and multi-hole (3-hole and 6-hole) diesel injectors to understand how the difference in hole arrangement and number affects the initial flow development of the diesel injectors. A propagation-based x-ray phase-contrast imaging technique was applied to compare the transient needle motion and near-nozzle flow characteristics of the single-and multi-hole injectors. The comparisons were made by dividing the entire injection process by three sub-stages: opening-transient, quasi-steady and closing-transient.

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Validation of Diesel Fuel Spray and Mixture Formation from Nozzle Internal Flow Calculation

Cited by 29 publications

References 7 publications

CFD Study of Needle Motion Influence on the Spray Conditions of Single-Hole Injectors

CFD Study of Needle Motion Influence on the Spray Conditions of Single-Hole Injectors

Large-eddy simulation analysis of the influence of the needle lift on the cavitation in diesel injector nozzles

Effect of the number and position of nozzle holes on in- and near-nozzle dynamic characteristics of diesel injection

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