What is the inverse equivalence ratio commonly referred to?

The inverse equivalence ratio is often referred to as the excess air ratio. This ratio provides a measure of how much air is supplied in comparison to the stoichiometric requirement for combustion. When the combustion process is fully balanced, the equivalence ratio would be one, indicating just the right amount of air for the fuel being used. If there is more air than needed, the equivalence ratio decreases (indicating a lean mixture), and the term used to express this condition is the excess air ratio.

In practical terms, the excess air ratio is significant in ensuring that combustion is as complete as possible, which improves efficiency and reduces emissions. Understanding this ratio is essential for power engineers when designing and operating combustion systems.