Adaptive Cycle Engines: Results with 2nd Generation Combustion Model
2022-01-0514
03/29/2022
- Event
- Content
- A more accurate combustion model, based on Fluent simulations including the effect of flame stretching and extinction, has been added to cycle and road simulations of an Adaptive Cycle Engine (ACE), where compressions and expansions do not follow a predefined sequence. Also, engine speed data from the Argonne Downloadable Dynamometer Database is used in the road simulations in lieu of the original constant-speed model. Results show a drop in predicted steady-state brake efficiency around 5% relative to the model using a standard Wiebe function for heat release rate, but peak bmep rises over 20%. Performance on road cycles is not greatly affected by the delayed combustion since the relationship between expansion mass and work is largely unchanged. Even with the refined model, ACE-equipped vehicles remain competitive with electric powertrains in pre-tax cost and overall emissions.
- Citation
- Ruiz, F., "Adaptive Cycle Engines: Results with 2nd Generation Combustion Model," SAE Technical Paper 2022-01-0514, 2022, .