Numerical Simulation of the Effect of 3D Needle Movement on Cavitation and Spray Formation in a Diesel Injector

Devassy, Bejoy Mandumpala; Edelbauer, Wilfried; Chapman, David G.

doi:10.1088/1742-6596/656/1/012092

Cited by 4 publications

(2 citation statements)

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“…Given the trends in the automotive industry, today it is necessary to have a resource of about 500 thousand km. It gives to designer the task of increasing the reliability of the most vulnerable elements of the diesel injectors: friction pairs, injector cone seat, nozzle holes and injector nozzle tip [1][2][3][4][5].…”

Section: Analysis Of Referencesmentioning

confidence: 99%

Modeling Of Hydrodynamic Processes in Diesel Injector Nozzle

Wróblewski¹

2019

mech

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Section: Analysis Of Referencesmentioning

confidence: 99%

Modeling Of Hydrodynamic Processes in Diesel Injector Nozzle

Wróblewski¹

2019

mech

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“…Concerning works considering the movement of wall boundaries, Koukouvinis et al [45,46] implemented a layering algorithm, adding/removing a layer of cells in FLUENT Ansys [46]. The transient effects due to the needle movement have been also taken into account by Devassy et al [47] and Batistoni and Grimaldi [48]. In the literature [49], the moving needle effects of a diesel injector on the development of the cavitating flow and spray flow characteristic parameters were investigated [50].…”

Section: Introductionmentioning

confidence: 99%

Transient Cavitation and Friction-Induced Heating Effects of Diesel Fuel during the Needle Valve Early Opening Stages for Discharge Pressures up to 450 MPa

et al. 2021

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An investigation of the fuel heating, vapor formation, and cavitation erosion location patterns inside a five-hole common rail diesel fuel injector, occurring during the early opening period of the needle valve (from 2 μm to 80 μm), discharging at pressures of up to 450 MPa, is presented. Numerical simulations were performed using the explicit density-based solver of the compressible Navier–Stokes (NS) and energy conservation equations. The flow solver was combined with tabulated property data for a four-component diesel fuel surrogate, derived from the perturbed chain statistical associating fluid theory (PC-SAFT) equation of state (EoS), which allowed for a significant amount of the fuel’s physical and transport properties to be quantified. The Wall Adapting Local Eddy viscosity (WALE) Large Eddy Simulation (LES) model was used to resolve sub-grid scale turbulence, while a cell-based mesh deformation arbitrary Lagrangian–Eulerian (ALE) formulation was used for modelling the injector’s needle valve movement. Friction-induced heating was found to increase significantly when decreasing the pressure. At the same time, the Joule–Thomson cooling effect was calculated for up to 25 degrees K for the local fuel temperature drop relative to the fuel’s feed temperature. The extreme injection pressures induced fuel jet velocities in the order of 1100 m/s, affecting the formation of coherent vortical flow structures into the nozzle’s sac volume.

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