Naslov
NUMERICAL MODELLING OF AUTO-IGNITION CHEMISTRY KINETICS IN COMPUTATIONAL FLUID DYNAMICS

Autori
Ban, Marko

Vrsta, podvrsta i kategorija rada
Ocjenski radovi, doktorska disertacija

Fakultet
Fakultet strojarstva i brodogradnje

Mjesto
Zagreb

Datum
14.09

Godina
2011

Stranica
140

Mentor
Duić, Neven

Ključne riječi
Modelling; Combustion; Auto-ignition; Chemistry mechanisms

Sažetak
The research in this work aims at improving application of the simulation of fuel ignition, focusing on the low-temperature auto-ignition phenomenon. The simulation of low temperature ignition has been typically achieved by using computationally demanding calculations of complex chemistry kinetics. This work attempts to reproduce the effects of complex chemistry by developing the methodology of efficient database creation consisting of the relevant ignition data used by existing combustion models. The research was separate in several phases: pre- processing, tabulation with data post-processing, and finally the implementation in the CFD software. In the pre-processing stage, available reaction mechanisms of most popular fuels have been thoroughly investigated and compared focused on their accuracy and complexity. Criteria for low- and high-temperature ignition were discussed as implemented into the tabulation application. In the post-processing part of the tabulation, several methods of data manipulation are suggested in forms of correlation functions and repair algorithms, used on the incomplete databases. Additionally, an approach of using existing data for two fuels to calculate the ignition values for their blend dependant only on the previously stored values and the blending factor is presented for the case of a fuel with varying research octane number. Finally, the database implementation into the CFD software is presented and validated. The validation was done in two stages. Initially the implemented data was compared against the results of the homogeneous reactor calculations using a comprehensive mechanism and in the final stage the model was used in a real-life case and successfully validated proving the viability of the entire process.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

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