Simulation of Cavitating Flows in Diesel Injectors

Dirke, M. von; Krautter, A.; Ostertag, J.; Mennicken, Maximilian; Badock, Christoph

doi:10.2516/ogst:1999018

Cited by 17 publications

(6 citation statements)

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“…Many publications deal with experimental investigations, [1,12]. In the last 8 years, a rapid development in the field of numerical simulation for flow with cavitation has occurred, see [20,15,11,13]. Two main directions can be observed.…”

Section: Introductionmentioning

confidence: 98%

Modeling of Cavitation

Iben

2002

Systems Analysis Modelling Simulation

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The paper deals with the study of source terms for Euler and Navier-Stokes equations which describe cavitation phenomena in one-and three-dimensional flow. Cavitation occurs in many technical applications, such as injectors, throttles and pumps. The modeling of cavitation is a challenge due to the complex structure of the cavitation process and the difficult numerical realization. The main problem is to simulate one-or threedimensional flow in order to predict the material of cavitation erosion or to determine the mass flow which will be limited if cavitation occurs in a throttle.

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Section: Introductionmentioning

confidence: 98%

Modeling of Cavitation

Iben

2002

Systems Analysis Modelling Simulation

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“…CFD modelling of cavitation requires two phase modelling due to generation of bubbles in diesel fluid flow within the solenoid valve geometry. Dirke et al [8] described the cavitating flow with a two fluid model where liquid and vapour phase are treated separately. For each phase, a transport equation for the averaged volume fraction is used.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the two-phase mixture flow model deals with two-phase continuity equations by employing a volume fraction transport equation. Unfortunately, the volume fraction contains no specific information on the shape or size of the cavitation entities in a volume cell (Dirke et al [8]).…”

Section: Introductionmentioning

confidence: 99%

CFD modeling of cavitation in solenoid valves for diesel fuel injection

Kayakol¹

2015

Computational Methods in Multiphase Flow VIII

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Solenoid valve of the injector flow shows characteristics of bubbly flow. In the valve seat region of solenoid valves the expansion of fuel flow from high pressure to low pressure regions creates bubbles. Two-phase flow characteristics of ball type solenoid valve for diesel common rail injectors are modelled with mixture model approach, which is suited for bubble-liquid flow. The cavitation model is based on the Rayleigh-Plesset equation. The flow pattern of valve geometry can be considered as high speed jet flow which occurs after throttling of high pressure fuel. The SST turbulence model is used to handle vortex formation. In solenoid valves the mass flow rate control with a throttling pipe and then expansion of jet flow in a diffuser cause bubble generation due to flow detachment and vortex formation, where pressure drops below vapour pressure of fuel. This results in cavitation erosion damage. The quantification of the erosive potential of collapsing vapour structures is done with a cavitation erosion index based on work hardening process. The pressure rise due to the impact of a microjet is estimated from classic water hammer approach. It is shown that cavitation model is very sensitive to condensation rate constant and density ratio of diesel and diesel vapour.

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“…It is common practice in cavitation model development, to assume mechanical equilibrium between the phases and thereby reduce the number of momentum equations to a single set (Senocak and Shyy, 2001;Yuan and Schnerr, 2001;Medvitz et al, 2002;Ahuja et al, 2001). For non-equilibrium descriptions of the dynamics of phase change, volume-fraction equations are retained in order to solve for the distribution of the phases in the flow (Von Dirke et al, 1999). From this point, many approaches can be taken to arrive at the final form of the governing equations depending how the micro-scale phenomena is treated.…”

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confidence: 99%

Numerical and Experimental Investigations of the Cavitating Behavior of an Inducer

Bakir¹,

Rey²,

Gerber³

et al. 2004

The International Journal of Rotating Machinery

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A robust CFD model is described, suitable for general three-dimensional flows with extensive cavitation at large density ratios. The model utilizes a multiphase approach, based on volume-scalar-equations, a truncated RayleighPlesset equation for bubble dynamics, and specific numerical modifications (in a finite-volume solution approach) to promote robust solutions when cavitation is present. The model is implemented in the CFD software CFX TASCflow 2.12. The validation of the model was done on an inducer designed and tested at LEMFI. First, The physical model and the numerical aspects are described. Then, the experimental and numerical methodologies, at cavitating regime, are presented. Finally, for several flow rates, the comparisons between experimental and simulated results on the overall performances, head drop and cavitation figures, are discussed. For a range of flow rates, good agreement between experiment and prediction was found.

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Simulation of Cavitating Flows in Diesel Injectors

Cited by 17 publications

References 0 publications

Modeling of Cavitation

Modeling of Cavitation

CFD modeling of cavitation in solenoid valves for diesel fuel injection

Numerical and Experimental Investigations of the Cavitating Behavior of an Inducer

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