The Gasoline_4comp_171sp__soot-particle-tracking.cks chemistry set consists of a 171-species gas-phase mechanism, and a soot surface mechanism. The focus of this chemistry set is on accurate soot modeling from combustion in spark-ignited engines. This chemistry set can be used to track soot particle using the Method of Moments in Ansys Forte.
The soot surface mechanism includes:
This mechanism represents gasoline-ethanol with the 4-component n-heptane/iso-octane / toluene/ethanol as the fuel surrogate. The mechanism captures the pathways necessary for only the high-temperature reactions. Since this mechanism does not include low-temperature reaction pathways, it cannot be used for predicting knocking.
The mechanism has been validated against fundamental data for the following conditions:
Equivalence ratios of 0.4-3. This range is to capture both GDI and port-fuel injection engine local environments.
Octane numbers of ~85-100. The composition used for mechanism reduction had a composition of 39/30/21/10 wt% toluene/iso-octane/n-heptane /ethanol. n-Heptane and iso-octane compositions can be modified to change the octane number within the range listed above.
This mechanism has been reduced from a larger gasoline kinetics mechanism consisting of ~2600 species, which has been thoroughly validated against fundamental experimental data for the operating conditions of interest in engines, under the Model Fuels Consortium [20]. The Ansys Model Fuel Library (MFL) Manual includes the mechanism validation plots. The mechanism was reduced from this comprehensive "full" mechanism using the Ansys Chemkin Reaction Workbench software [31], for the conditions listed above.
For the emissions, the following species predictions are expected to be accurately predicted:
The species names in the chemistry file for the fuel species are: