10.1021/acsomega.9b03623.s001
Marco Cristofaro
Marco
Cristofaro
Wilfried Edelbauer
Wilfried
Edelbauer
Phoevos Koukouvinis
Phoevos
Koukouvinis
Manolis Gavaises
Manolis
Gavaises
Influence of Diesel Fuel Viscosity on Cavitating Throttle
Flow Simulations under Erosive Operation Conditions
American Chemical Society
2020
pressure drop
flow features
flow visualization
micro-orifice flows
microscale turbulence
velocity profiles
structure model
pressure peaks
flow channel geometry
fuel viscosity
cavitation erosion
Erosive Operation Conditions
test case
vapor cavity distribution
cavitating flow
flow detachment
Reynolds numbers
integral mass flow
I-channel geometry
European Norm
subgrid scale modeling
Diesel Fuel Viscosity
multifluid approach
cavitating fuel injectors
momentum conservation equation
laser-induced fluorescence measurements
well-reported benchmark
velocity fields
Cavitating Throttle Flow Simulations
pressure-based compressible solver
Standardization 2009
European Committee
2020-03-27 00:29:18
Media
https://acs.figshare.com/articles/media/Influence_of_Diesel_Fuel_Viscosity_on_Cavitating_Throttle_Flow_Simulations_under_Erosive_Operation_Conditions/12037641
This
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.