Vitiate:

To make vicious, faulty, or imperfect; to render defective; to injure the substance or qualities of; to impair; to contaminate; to spoil; as, exaggeration vitiates a style of writing; sewer gas vitiates the air.

In our experiment, the coflow is primarily air. However, it is vitiated by the products and heat release of the lean premixed flame.

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