1D Simulation Modeling for an Exhaust Aftertreatment System SCR Calibration Modeling in GT-SUITE
Typ
Examensarbete för masterexamen
Program
Automotive engineering (MPAUT), MSc
Publicerad
2021
Författare
Ramanjaneyalu, Puneeth
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
The Euro legislative regulations are imposed successively to hold back toxic elements
that are harmful to the environment. Carbon monoxide (CO), hydrocarbons
(HC) and nitric oxide (NOx) are the major toxic elements that cause serious health
hazards for the living species. From many research works, selective catalytic reduction
(SCR) is the most promising technology to address NOx. The objective of this
project is to develop a surface reaction mechanism model, reaction rate calibration
for SCR catalyst and validation.
Firstly, building the SCR catalyst and surface reaction mechanism model in GTSUITE.
The reaction rate calibration or characterization is performed for six reaction
rate expressions with 18 unknown parameters by applying physical properties of the
catalyst for example diameter and area of the catalyst. Furthermore, the digital laboratory
Simulink black-box is utilized to produce the target reaction rate curves for
all chemical reactions to calibrate the parameters then to compare with simulated
GT-model results. Finally, validation for steady state or urea stairs, US, conditions
and transient driving cycle conditions against WHTC (world harmonized transient
driving cycles) for the Euro V regulations using tail pipe, engine-out emissions, mass
flow rate and temperature traces experiments data.
Overall, chemical kinetics modeling for SCR catalyst in GT-SUITE was successfully
implemented and have reasonable results for urea stair cases, but the outcome can
be further improved for transient cycles by extract information from 3D CFD to 1D
in the future. Inevitably, simulations analysis is the best possible way to validate
the results in quick time with low cost and it is a key factor during the development
process.
Beskrivning
Ämne/nyckelord
SCR, catalyst, chemical kinetics, validation, modeling, simulations, calibration and experiment data