ao9b03623_si_001.mpg (1.57 MB)
Influence of Diesel Fuel Viscosity on Cavitating Throttle Flow Simulations under Erosive Operation Conditions
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posted on 2020-03-27, 00:29 authored by Marco Cristofaro, Wilfried Edelbauer, Phoevos Koukouvinis, Manolis GavaisesThis
work investigates the effect of liquid fuel viscosity, as
specific by the European Committee for Standardization 2009 (European
Norm) for all automotive fuels, on the predicted cavitating flow in
micro-orifice flows. The wide range of viscosities allowed leads to
a significant variation in orifice nominal Reynolds numbers for the
same pressure drop across the orifice. This in turn, is found to affect
flow detachment and the formation of large-scale vortices and microscale
turbulence. A pressure-based compressible solver is used on the filtered
Navier–Stokes equations using the multifluid approach; separate
velocity fields are solved for each phase, which share a common pressure.
The rates of evaporation and condensation are evaluated with a simplified
model based on the Rayleigh–Plesset equation; the coherent
structure model is adopted for the subgrid scale modeling in the momentum
conservation equation. The test case simulated is a well-reported
benchmark throttled flow channel geometry, referred to as “I-channel”;
this has allowed for easy optical access for which flow visualization
and laser-induced fluorescence measurements allowed for validation
of the developed methodology. Despite its simplicity, the I-channel
geometry is found to reproduce the most characteristic flow features
prevailing in high-speed flows realized in cavitating fuel injectors.
Subsequently, the effect of liquid viscosity on integral mass flow,
velocity profiles, vapor cavity distribution, and pressure peaks indicating
locations prone to cavitation erosion is reported.
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pressure dropflow featuresflow visualizationmicro-orifice flowsmicroscale turbulencevelocity profilesstructure modelpressure peaksflow channel geometryfuel viscositycavitation erosionErosive Operation Conditionstest casevapor cavity distributioncavitating flowflow detachmentReynolds numbersintegral mass flowI-channel geometryEuropean Normsubgrid scale modelingDiesel Fuel Viscositymultifluid approachcavitating fuel injectorsmomentum conservation equationlaser-induced fluorescence measurementswell-reported benchmarkvelocity fieldsCavitating Throttle Flow Simulationspressure-based compressible solverStandardization 2009European Committee
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