Evaluation of the Ethanol-Diesel Spray Interaction during Ignition in a Dual-Fuel DICI Engine Using an Experimentally Validated CFD Model
Technical Paper
2021-01-0521
ISSN: 0148-7191, e-ISSN: 2688-3627
Sector:
Event:
SAE WCX Digital Summit
Language:
English
Abstract
The ignition dynamics of an ethanol-diesel direct injection compression ignition
engine is investigated based on 3D RANS simulations. Experimental results of a
previous test campaign on a single-cylinder research engine equipped with two
direct injectors are used to validate the CFD model. Four reference engine
conditions are considered, including split and overlapped injections of ethanol
and diesel at low and high load. Combustion driven by the separate direct
injection of pure ethanol and diesel as pilot fuel is simulated with AVL Fire
and AVL Tabkin adopting the flamelet generated manifold combustion model. The
in-cylinder pressure and apparent rate of heat release traces computed in the
simulations are found to be consistent with the corresponding experimental
results. The influence of several simulation input parameters on ethanol
combustion characteristics is evaluated, highlighting a high sensitivity to the
initial in-cylinder temperature and a limited impact of the swirl number. The
spatial and temporal interaction between ethanol and diesel sprays during
ignition is investigated based on simulation results of in-cylinder flow
features. Under the engine conditions considered in this study, ethanol ignition
is found to originate within the spray plumes adjacent to the burning diesel
sprays and to subsequently propagate towards the other ethanol sprays. The peak
sequence identified in the ARoHR traces of experiments and simulations
corresponds to the ignition sequence of the ethanol sprays. The coupling between
experimental and simulation results allowed to achieve a detailed understanding
of the ignition dynamics of an ethanol-diesel DICI engine. The validated
simulation model will enable the performance evaluation of alternative hardware
configurations of the dual-injector system.
Authors
Topic
Citation
Giramondi, N., Konstanzer, D., and Erlandsson, A., "Evaluation of the Ethanol-Diesel Spray Interaction during Ignition in a Dual-Fuel DICI Engine Using an Experimentally Validated CFD Model," SAE Technical Paper 2021-01-0521, 2021, https://doi.org/10.4271/2021-01-0521.Data Sets - Support Documents
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