Isentropic one-fluid modelling of unsteady cavitating flow

Liu, T. G.; Khoo, Boo Cheong; Xie, Wenfeng

doi:10.1016/j.jcp.2004.05.010

Cited by 132 publications

(89 citation statements)

References 30 publications

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“…Indeed, if the effective velocity is calculated by means of equation (19) and plotted as a function of pressure drop (right plot of Figure 8) it is quite easy to appreciate the velocity rise when there is vapour in the nozzle orifice.…”

Section: Momentum Flux and Effective Velocitymentioning

confidence: 99%

“…Cavitation modeling could be performed considering two different approaches: two fluid flow models [18] or continuum flow models [19], [20], [21], [22]. The first ones treat the liquid and vapour phases separately, whereas the continuum nozzle flow models (or homogeneous equilibrium models) consider the liquid and vapour as a homogeneous mixture.…”

Section: Introductionmentioning

confidence: 99%

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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

122

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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.

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Section: Momentum Flux and Effective Velocitymentioning

confidence: 99%

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

122

View full text Add to dashboard Cite

show abstract

“…Our code is seen to accurately capture all these flow structures without the presence of unphysical oscillations across the discontinuities. Next, the one-dimensional cavitation is simulated 7 . Initially, two water streams meet at the center of the 1m long tube under the uniform pressure of 10 8 Pa and temperature of 293K.…”

Section: One-dimensional Shock Tube Problemsmentioning

confidence: 99%

The Numerical Simulation of Unsteady Cavitation Evolution Induced by Pressure Wave

Khoo

Zheng

2014

Int. J. Mod. Phys. Conf. Ser.

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The present study is focused on the numerical simulation of pressure wave propagation through the cavitating compressible liquid flow, its interaction with cavitation bubble and the resulting unsteady cavitation evolution. The compressibility effects of liquid water are taken into account and the cavitating flow is governed by one-fluid cavitation model which is based on the compressible Euler equations with the assumption that the cavitation is the homogeneous mixture of liquid and vapour which are locally under both kinetic and thermodynamic equilibrium. Several aspects of the method employed to solve the governing equations are outlined. The unsteady features of cavitating flow due to the external perturbation, such as the cavitation deformation and collapse and consequent pressure increase are resolved numerically and discussed in detail. It is observed that the cavitation bubble collapse is accompanied by the huge pressure surge of order of 100 bar, which is thought to be responsible for the material erosion, noise, vibration and loss of efficiency of operating underwater devices.

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“… Continuum nozzle flow models or homogeneous equilibrium models [21][22][23], henceforth mentioned as HEM, on which it is assumed that liquid and vapour phases are always perfectly mixed in the sub-grid cell and also the temperature is constant. These homogeneous equilibrium models are most widely used and [23].…”

Section: Introductionmentioning

confidence: 99%

A contribution to the understanding of cavitation effects in Diesel injector nozzles through a combined experimental and computational investigation

Payri

Salvador

et al. 2012

Computers & Fluids

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ElsevierPayri González, F.; Payri, R.; Salvador Rubio, FJ.; Martínez López, J. (2012). A contribution to the understanding of cavitation effects in Diesel injector nozzles through a combined experimental and computational investigation. Computers and Fluids. 58:88-101. doi:10.1016/j.compfluid.2012 ABSTRACTIn this paper a combined experimental and computational study was carried out in order to assess the ability of a Homogeneous Equilibrium Model in predicting the experimental behaviour observed from the hydraulical characterization of a nozzle. The nozzle used was a six-orifice microsac nozzle, with cylindrical holes, and therefore inclined to cavitate. The experimental results available for the validation purpose comprised measurements of mass flow rate and spray momentum flux, which correctly combined provide also fundamental information such as discharge coefficient, nozzle exit effective velocity and area contraction. The model was proved to be able of 2 reproducing the experimental results with high degree of confidence and, through the exploration of the internal flow, allowed the explanation of widely reported experimental findings related to cavitation phenomena: the mass flow choking induced by cavitation and the increment of effective injection velocity.

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Isentropic one-fluid modelling of unsteady cavitating flow

Cited by 132 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

The Numerical Simulation of Unsteady Cavitation Evolution Induced by Pressure Wave

A contribution to the understanding of cavitation effects in Diesel injector nozzles through a combined experimental and computational investigation

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