Abstract

In multi-component reacting flows, it is well known that significant simplifications are available when the ``all Lewis numbers are unity'' assumption can be justified. Under this assumption, certain linear combinations of the dependent variables, commonly known as the Shvab-Zel'dovich (SZ) variables, are ``decoupled'' from the chemistry terms. A derivation is presented here showing that the same simplifications can be achieved under less restrictive conditions. The means to check whether these conditions are satisfied is provided.
 

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