Development and Validation of a Multi-zone Predictive Combustion Model for Large-Bore Dual-Fuel Engines
- Federico Millo - Politecnico di Torino, Italy ,
- Francesco Accurso - Politecnico di Torino, Italy ,
- Andrea Piano - Politecnico di Torino, Italy ,
- Navin Fogla - Gamma Technologies LLC, USA ,
- Gennaro Caputo - Wärtsilä Italia S.p.A., Italy ,
- Alberto Cafari - Wärtsilä Finland OY, Finland ,
- Jari Hyvönen - Wärtsilä Finland OY, Finland
Journal Article
03-15-05-0038
ISSN: 1946-3936, e-ISSN: 1946-3944
Sector:
Topic:
Citation:
Millo, F., Accurso, F., Piano, A., Fogla, N. et al., "Development and Validation of a Multi-zone Predictive Combustion Model for Large-Bore Dual-Fuel Engines," SAE Int. J. Engines 15(5):703-718, 2022, https://doi.org/10.4271/03-15-05-0038.
Language:
English
Abstract:
Numerical simulation represents a fundamental tool to support the development
process of new propulsion systems. In the field of large-bore dual-fuel (DF)
engines, the engine simulation by means of fast running numerical models is
nowadays essential to reduce the huge effort for testing activities and speed up
the development of more efficient and low-emissions propulsion systems. However,
the simulation of the DF combustion by means of a
zero-dimensional/one-dimensional (0D/1D) approach is particularly challenging
due to the combustion process evolution from spray autoignition to turbulent
flame propagation and the complex interaction between the two fuels. In this
regard, in this activity a 0D/1D multi-zone DF combustion model was developed
for the simulation of the combustion process in large-bore DF engines. The model
combines a multi-packet approach for tracking the evolution and the autoignition
of the pilot fuel with an entrainment and burn-up approach for the simulation of
the premixed air-gas mixture flame propagation. To properly consider the
properties of the fuels involved in the combustion process and to capture the
interaction between the two fuels, the DF combustion model was optimized by
developing and implementing a refined ignition delay model and specific laminar
and turbulent flame speed correlations optimized for high-pressure and lean
air-gas mixture. In addition to this, a multi-zone Nitrogen Oxides (NOx) model
was developed and integrated into the combustion model. Experimental
measurements from a single-cylinder Wärtsilä research engine were used for the
model development and validation. The proposed DF combustion model is able to
properly capture the effect of the main engine settings (i.e., load, pilot fuel
injection strategy, compression ratio (CR), and boost pressure), providing
accurate predictions of the ignition timing, combustion duration, and NOx
emissions. The developed numerical model can be therefore exploited to virtually
assess the potential of different engine technologies and calibration
strategies.