A comprehensive study on the effect of cavitation on injection velocity in diesel nozzles

López, J. Javier; Salvador, Francisco; Garza, Oscar A. de la; Arrégle, Jean

doi:10.1016/j.enconman.2012.03.032

Cited by 27 publications

(4 citation statements)

References 30 publications

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“…Therefore, the absense of cavitation phenomenon under the tested operating conditions can be concluded. This behaviour was also observed by other authors [18,23] when they analysed the influence of cavitation in common-rail diesel nozzle on the mass flow rate. After that, the injected fuel mass corresponding to each one of the tested operating conditions was determined, from integration of the area under the temporal evolution of mass flow rate measurement shown in Figure 2.…”

Section: Methodssupporting

confidence: 83%

Hydraulic Interactions between Injection Events Using Multiple Injection Strategies and a Solenoid Diesel Injector

Martínez-Martínez¹,

Garza²,

García-Yera³

et al. 2021

Energies

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An experimental study was performed to explore the influence of dwell time on the hydraulic interactions between injection events using pilot injection strategy, split injection strategy, post injection strategy and a solenoid diesel injector. To do so, a sweep of dwell time from 0.55 up to 2 ms using all multiple injection strategies and levels of rail pressure, of 80, 100 and 120 MPa, and single level of back pressure, of 5 MPa, was performed. The hydraulic interactions between injection events were characterized through the second injection hydraulic delay and second injection mass in an injection discharge curve indicator equipped with all the components required for its operation and control. In order to define the operating conditions of the multiple injection strategies, to ensure the same injected fuel mass in all cases, the characteristic curves of injection rate for the solenoid diesel injector studied were obtained. The second injection hydraulic delay increases with dwell time values in the range of 0.55–0.9 ms for all multiple injection strategies and levels of rail pressure tested. Conversely, the second injection hydraulic delay decreases with dwell time values higher than 0.9 ms. Moreover, the second hydraulic delay depends mainly on the dwell time and not on the injected fuel mass during the first injection event. The second injection mass increases with dwell values less than 0.6 ms. By contrast, the second injection mass is not significantly affected by that of the first injection at a dwell time higher than 0.6 ms.

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Section: Methodssupporting

confidence: 83%

Hydraulic Interactions between Injection Events Using Multiple Injection Strategies and a Solenoid Diesel Injector

Martínez-Martínez¹,

Garza²,

García-Yera³

et al. 2021

Energies

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“…On the one hand, appearance and growth of cavitation are also affected by different liquid properties such as density, viscosity, and surface tension. Liquids having less viscosity (the Reynolds number is higher) tend to have earlier cavitation . On the other hand, a higher liquid viscosity inhibits the inception of cavitation …”

Section: Introductionmentioning

confidence: 99%

Prediction of the Impact of Nozzle Geometry on Spray Characteristics

et al. 2021

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In the present paper, the formation and development of cavitation inside the nozzle of an atomizer with different geometrical characteristics have been studied numerically. Different shapes of inlet nozzles and different nozzle-length-to-diameter ratios have been investigated. The developed model has been built as a three-dimensional (3D) one, where the turbulence is modeled considering large eddy simulation. The obtained computational results showed good agreement with the reported experimental results. It has been found that the occurrence of cavitation depends on the amount of energy needed to overcome the viscosity and friction between the liquid layers. The mass flowing through the nozzle decreases with increasing cavitation. The intensity of cavitation depends on the nozzle entrance shape. Sharp edges cause cavitation to occur early in the nozzle, followed by an inclined shape, and then the curved entrance. The dissipative energy in the cavitation and bubble collapse result in an increase in the turbulent kinetic energy of the issuing liquid. This causes more liquid disintegration, leading to larger spray volume and smaller droplet size. The obtained results for spray droplet size distribution have been compared with experimental data developed by other researchers, and a good agreement has also been found.

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“…Currently, only Lebas et al [6] have simulated turbulence at the outlet of the nozzle, accounting for the turbulence generated by the fluid inside the nozzle duct. Many studies have related cavitating [7,8,9,10,11,12,13] and non-cavitating conditions [14,15,16,17] inside the nozzle with non negligible effects on the turbulence distribution at the nozzle outlet. Furthermore, it has been proved in previous works [18] [19] that the higher the turbulence at the injector outlet is, the more the atomization affects the spray shape, as the intact core length reduces significantly and the atomization process starts earlier.…”

Section: Introductionmentioning

confidence: 99%

Analysis on the effects of turbulent inflow conditions on spray primary atomization in the near-field by direct numerical simulation

Salvador

Ruíz

Crialesi-Esposito

et al. 2018

International Journal of Multiphase Flow

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It is widely acknowledged that the development of sprays in the near-field is of primary importance for the spray formation downstream, as it affects both the spray angle, as well as the intact core length. In this frame, the present work aims to study the effects of turbulence inlet boundary condition on the spray formation by means of Direct Numerical Simulations on a real condition at low Reynolds number. To this extent, the code Paris-Simulator has been used, while a digital filter-based algorithm was used in order to generate synthetic turbulence at the inlet boundary condition. The influence of turbulence intensity and lengthscale on the atomization process has been studied and analyzed through 3 simulation for which these parameters have been varied. The results clearly highlight how the atomization is heavily affected by the inlet turbulence configuration. An analysis of the different atomizing conditions has been conducted, aiming to understand how the variation introduced by the inlet boundary condition on the velocity field is affecting the local atomization dynamics.

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A comprehensive study on the effect of cavitation on injection velocity in diesel nozzles

Cited by 27 publications

References 30 publications

Hydraulic Interactions between Injection Events Using Multiple Injection Strategies and a Solenoid Diesel Injector

Hydraulic Interactions between Injection Events Using Multiple Injection Strategies and a Solenoid Diesel Injector

Prediction of the Impact of Nozzle Geometry on Spray Characteristics

Analysis on the effects of turbulent inflow conditions on spray primary atomization in the near-field by direct numerical simulation

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