Study of mass and momentum transfer in diesel sprays based on X-ray mass distribution measurements and on a theoretical derivation

Desantes, J.M.; Salvador, F.J.; López, J. Javier; Morena, Joaquín De la

doi:10.1007/s00348-010-0919-8

Cited by 38 publications

(51 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Despite the fact that cavitation could be not desirable in pumps or valves since it could cause important damages, in diesel injectors cavitation leads to an increase in the spray cone angle, which is expected to improve the air-fuel mixing process [10], [11], [12].…”

Section: Introductionmentioning

confidence: 99%

Study of the influence of the needle lift on the internal flow and cavitation phenomenon in diesel injector nozzles by CFD using RANS methods

Salvador

Martinez-Lopez

Caballer

et al. 2013

Energy Conversion and Management

121

View full text Add to dashboard Cite

Elsevier Salvador, FJ.; Martínez López, J.; Caballer Fernández, M.; Alfonso Laguna, CD. (2013). Study of the influence of the needle lift on the internal flow and cavitationphenomenon in diesel injector nozzles by CFD using RANS methods. Energy Conversion and Management. 66:246-256. doi:10.1016/j.enconman.2012.10 ABSTRACTIt is well known that cavitation phenomenon in diesel injector nozzles has a strong influence on the internal flow during the injection process and spray development.However, its influence on the flow during needle opening and closing remains still unclear due to the huge difficulties related to performing experiments at partial needle lifts.In this paper, an extended computational study has been performed in a multi-hole Once the code has been validated, it has been possible to study in depth the internal nozzle flow and its characteristics at the outlet at different partial needle lifts.Nevertheless, not only the main flow features have been explained, but also the cavitation appearance and the turbulence development, which present huge differences between the different needle lifts simulated.

show abstract

Section: Introductionmentioning

confidence: 99%

Study of the influence of the needle lift on the internal flow and cavitation phenomenon in diesel injector nozzles by CFD using RANS methods

Salvador

Martinez-Lopez

Caballer

et al. 2013

Energy Conversion and Management

121

View full text Add to dashboard Cite

show abstract

“…Their model is briefly described in this section. More details can be found in Payri et al [2,10] and Desantes et al [11]. The model considers an isothermal stationary spray as a symmetric cone (cfr.…”

Section: Methodsmentioning

confidence: 99%

Influence of Diesel Surrogates on the Behavior of Simplified Spray Models

Galle

Verhelst

2012

Lecture Notes in Electrical Engineering

View full text Add to dashboard Cite

Numerous experimental investigations make use of diesel surrogates to make the computational time reasonable. In the few studies where measured (surrogate and real diesel) and computed (surrogate only) results have been compared, the selection methodology for the surrogate constituent compounds and the measures taken to validate the chemical kinetic models are not discussed, and the range of operating conditions used is often small. Additionally, most simplified models use tuning variables to fit model results to measurements. This work makes the comparison between some frequently used diesel surrogates using a simple 1D vaporizing spray model, with the spray cone angle as the tuning parameter. Results show that liquid length and fuel fraction strongly depend on the physical properties of the used fuel for a fixed spray angle. These parameters are important for modeling auto-ignition and pollutant formation. The spray angle is varied till the spray length is the same for each surrogate. Results show important differences between other spray parameters such as local mixture fraction and axial velocity.

show abstract

“…the energy flux of the two-phase fluid is solely that coming from the original input pressure. The droplets transfer kinetic energy to the initially static gas by drag forces [11,12] and they reach local dynamic equilibrium in such a way that both gas and liquid droplets move at the same speed v inside the jet [13]; this is also the main assumption under the wide class of "Locally Homogeneous Flows" (LHF) [14,15,16]. We assume that the latter process occurs so fast immediately outside the nozzle's exit that we may neglect the non-equilibrium zone near the nozzle.…”

Section: Conservation Of Powermentioning

confidence: 99%

“…the jet's "centerline". There are some models [5,3,17,18,13] which apply Gaussian velocity distributions as initial assumptions; however, this calculation will be included in a later work since we anticipate that it would not lead to a major refinement of the axial centreline quantities.…”

Section: Density Of the Two-phase Fluidmentioning

confidence: 99%

Mathematical models for turbulent round jets based on “ideal” and “lossy” conservation of mass and energy

Franco

Fukumoto

2017

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

View full text Add to dashboard Cite

We propose mathematical models for turbulent round atomized liquid jets that describe its dynamics in a simple but comprehensive manner with the apex angle of the cone being the main disposable parameter. The basic assumptions are that (i) the jet is statistically stationary and that (ii) it can be approximated by a mixture of two fluids with the phases in local dynamic equilibrium, or so-called locally homogeneous flow (LHF). The models differ in their particular balance of explanatory capability and precision. To derive them we impose partial conservation of the initial mass and energy fluxes, introducing loss factors again as disposable parameters. Depending on each model, the equations admit explicit or implicit analytical solutions or a numerical solution in the discretized model case. The described variables are the the two-phase fluid's composite density and velocity, both as functions of the distance from the nozzle, from which the dynamic pressure is calculated. Keywords Mathematical Modeling, Two Phase Fluid, Locally Homogeneous Flow, Statistically Stationary State IntroductionThe range of applications involving atomizing liquid jets forming two-phase fluid flows is still large. The complexity of the atomizing process, involving numerous physical phenomena and many variables, ranging from the conditions inside the nozzle (or some generating source) to the interaction between the atomization process and the environment into which the jet is penetrating, all account for numerous challenges in physical and mathematical modeling. Notwithstanding, several such models have been attempted to describe different aspects of the jets in this regime. For example, differential equations for a fuel jet's tip penetration distance as a function of time [1, 2, 3]; models for the gas entrainment rate in a full-cone spray [4]; and a one-dimensional model for the induced air velocity in sprays [5]. None of these models is sufficient by itself as explained below. In this study we propose three original related 1D mathematical models, so-called "energy jet models", for the macroscopic dynamics of a turbulent round jet ensuing from a circular nozzle into a stagnant fluid. This kind of jets serves as a basis for many industrial processes in modern manufacturing industry [6]. An advantage of our models over other analytical 1D models is that the simplest case of the "ideal energy jet" has a single experimentally measurable parameter (the jet half-angle θ) while it maintains reasonable predictive power and gives theoretical understanding that allows it to analytically calculate other physical quantities of interest. Moreover, the herein reported other extended models class, the "lossy energy jet" models, apply an energy conservation approach with simple turbulence and energy dissipation models, resulting in increased accuracy. Compared to the present study, past models either lack a description of the density or liquid fraction of the spray, make unrealistic assumptions or introduce parameters unavailable experimentally...

show abstract

Study of mass and momentum transfer in diesel sprays based on X-ray mass distribution measurements and on a theoretical derivation

Cited by 38 publications

References 30 publications

Study of the influence of the needle lift on the internal flow and cavitation phenomenon in diesel injector nozzles by CFD using RANS methods

Study of the influence of the needle lift on the internal flow and cavitation phenomenon in diesel injector nozzles by CFD using RANS methods

Influence of Diesel Surrogates on the Behavior of Simplified Spray Models

Mathematical models for turbulent round jets based on “ideal” and “lossy” conservation of mass and energy

Contact Info

Product

Resources

About