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Equivalence ratio Formula

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Equivalence Ratio is defined as the ratio of the fuel mass flow rate to the air mass flow rate divided by the same ratio at the stoichiometry of the reaction considered. Check FAQs

Φ = \frac{R a}{R f}

Φ - Equivalence Ratio?R_a - Actual Air Fuel Ratio?R_f - Stoichiometric Air Fuel Ratio?

Equivalence ratio Example

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Here is how the Equivalence ratio equation looks like with Values.

Here is how the Equivalence ratio equation looks like with Units.

Here is how the Equivalence ratio equation looks like.

1.2245 = \frac{18}{14.7}

1.2245 = \frac{18}{14.7}

1.2245 = \frac{18}{14.7}

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Equivalence ratio Solution

Follow our step by step solution on how to calculate Equivalence ratio?

FIRST Step Consider the formula

Φ = \frac{R a}{R f}

Next Step Substitute values of Variables

∴

Φ = \frac{18}{14.7}

Next Step Prepare to Evaluate

∴

Φ = \frac{18}{14.7}

Next Step Evaluate

∴

Φ = 1.22448979591837

LAST Step Rounding Answer

∴

Φ = 1.2245

Equivalence ratio Formula Elements

Variables

Equivalence Ratio

Equivalence Ratio is defined as the ratio of the fuel mass flow rate to the air mass flow rate divided by the same ratio at the stoichiometry of the reaction considered.

Symbol: Φ

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Equivalence Ratio

Actual Air Fuel Ratio

Actual Air Fuel Ratio is defined as the ratio of mass of fuel to mass of air in fuel and air mixture in actual working conditions of IC engines.

Symbol: R_a

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Actual Air Fuel Ratio

Stoichiometric Air Fuel Ratio

Stoichiometric Air Fuel Ratio is defined as the theoretical air fuel ratio mixture of a IC engine.

Symbol: R_f

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Stoichiometric Air Fuel Ratio

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How to Evaluate Equivalence ratio?

Equivalence ratio evaluator uses Equivalence Ratio = Actual Air Fuel Ratio/Stoichiometric Air Fuel Ratio to evaluate the Equivalence Ratio, The equivalence ratio Φ is defined as the ratio of the fuel mass flow rate to the air mass flow rate divided by the same ratio at the stoichiometry of the reaction considered. Equivalence Ratio is denoted by Φ symbol.

How to evaluate Equivalence ratio using this online evaluator? To use this online evaluator for Equivalence ratio, enter Actual Air Fuel Ratio (R_a) & Stoichiometric Air Fuel Ratio (R_f) and hit the calculate button.

FAQs on Equivalence ratio

What is the formula to find Equivalence ratio?

The formula of Equivalence ratio is expressed as Equivalence Ratio = Actual Air Fuel Ratio/Stoichiometric Air Fuel Ratio. Here is an example- 1.22449 = 18/14.7.

How to calculate Equivalence ratio?

With Actual Air Fuel Ratio (R_a) & Stoichiometric Air Fuel Ratio (R_f) we can find Equivalence ratio using the formula - Equivalence Ratio = Actual Air Fuel Ratio/Stoichiometric Air Fuel Ratio.

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Equivalence ratio Formula

Equivalence ratio Example

Equivalence ratio Solution

Equivalence ratio Formula Elements

Other formulas in Important Formulas of Engine Dynamics category

How to Evaluate Equivalence ratio?

FAQs on Equivalence ratio

Variable Name