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In combustion, heat release parameter is a dimensionless parameter which measures the amount of heat released by the combustion process. It is defined as
where
In typical combustion process, α ≈ 0.7 − 0.9 {\displaystyle \alpha \approx 0.7-0.9}. For isobaric combustion, using ideal gas law, the parameter can be expressed in terms of density, i.e.,
The ratio of burnt gas to unburnt gas temperature is
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