In combustion, heat release parameter (or gas expansion parameter) is a dimensionless parameter which measures the amount of heat released by an adibatic combustion process.
[1][2] It is defined as where In typical combustion process,
For isobaric combustion, using ideal gas law, the parameter can be expressed in terms of density,[3] i.e., The ratio of burnt gas to unburnt gas temperature is The gas expansion ratio is simply defined by which is related to
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