Hi Shuai:
An inert can be included in a Chemkin mechanism by putting it in the thermo and transport files with a different name from its chemical twin (also in the species list for the mechanism). If it is completely excluded from any reactions, you will get a warning when the mechanism is pre-processed that it does not participate in any reaction. This is ok. It can also be used as a third body and diluent (if fed at an inlet in the resulting simulation).
Best Regards,
Judy
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