Equivalence ratio Calculator

✖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.ⓘ Actual Air Fuel Ratio [R_a]			+10% -10%
✖Stoichiometric Air Fuel Ratio is defined as the theoretical air fuel ratio mixture of a IC engine.ⓘ Stoichiometric Air Fuel Ratio [R_f]			+10% -10%

✖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.ⓘ Equivalence ratio [Φ]

⎘ Copy

👎

Formula

LaTeX

Reset

👍

Download Important Formulas of Engine Dynamics Formulas PDF PDF Image

Equivalence ratio Solution

STEP 0: Pre-Calculation Summary

Formula Used

Equivalence Ratio = Actual Air Fuel Ratio/Stoichiometric Air Fuel Ratio
Φ = R_a/R_f
This formula uses 3 Variables

Variables Used

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

STEP 1: Convert Input(s) to Base Unit

Actual Air Fuel Ratio: 18 --> No Conversion Required
Stoichiometric Air Fuel Ratio: 14.7 --> No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

Φ = R_a/R_f --> 18/14.7

Evaluating ... ...

Φ = 1.22448979591837

STEP 3: Convert Result to Output's Unit

1.22448979591837 --> No Conversion Required

FINAL ANSWER

1.22448979591837 ≈ 1.22449 <-- Equivalence Ratio

(Calculation completed in 00.004 seconds)

You are here -

Home » Physics » IC Engine » Engine Performance Parameters » Engine Dynamics » Mechanical » Important Formulas of Engine Dynamics » Equivalence ratio

Credits

Created by Akshat Nama

Indian Institute of Information Technology, Design And Manufacturing (IIITDM ), Jabalpur

Akshat Nama has created this Calculator and 4 more calculators!

Verified by Kartikay Pandit

National Institute Of Technology (NIT), Hamirpur

Kartikay Pandit has verified this Calculator and 400+ more calculators!

< Important Formulas of Engine Dynamics Calculators

Brake Power given Mean Effective Pressure

LaTeX Go Brake Power = (Brake Mean Effective Pressure*Stroke Length*Area of Cross Section*(Engine Speed))

Beale Number

LaTeX Go Beale Number = Engine Power/(Average Gas Pressure*Piston Swept Volume*Engine Frequency)

Brake specific fuel consumption

LaTeX Go Brake Specific Fuel Consumption = Fuel Consumption in IC engine/Brake Power

Brake Power given Mechanical Efficiency

LaTeX Go Brake Power = (Mechanical Efficiency/100)*Indicated Power

< Characteristics and Operational Metrics Calculators

Beale Number

LaTeX Go Beale Number = Engine Power/(Average Gas Pressure*Piston Swept Volume*Engine Frequency)

Swept Volume

LaTeX Go Swept Volume = (((pi/4)*Inner Diameter of Cylinder^2)*Stroke Length)

Mean piston speed

LaTeX Go Mean Piston Speed = 2*Stroke Length*Engine Speed

Friction Power

LaTeX Go Friction Power = Indicated Power-Brake Power

Equivalence ratio Formula

LaTeX Go

Equivalence Ratio = Actual Air Fuel Ratio/Stoichiometric Air Fuel Ratio
Φ = R_a/R_f

Air-fuel ratio

A mixture that contains just enough air for complete combustion of all the fuel in the mixture is called a chemically correct or stoi-chiometric fuel-air ratio. A mixture having more fuel than that in a chemically correct mixture is termed as rich mixture and a mixture that contains less fuel (or excess air) is called a lean mixture. The ratio of actual fuel-air ratio to stoichiometric fuel-air ratio is called equivalence ratio and is denoted by o.

How to Calculate Equivalence ratio?

Equivalence ratio calculator uses Equivalence Ratio = Actual Air Fuel Ratio/Stoichiometric Air Fuel Ratio to calculate 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 calculate Equivalence ratio using this online calculator? To use this online calculator for Equivalence ratio, enter Actual Air Fuel Ratio (R_a) & Stoichiometric Air Fuel Ratio (R_f) and hit the calculate button. Here is how the Equivalence ratio calculation can be explained with given input values -> 1.22449 = 18/14.7.

FAQ

What is 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 and is represented as Φ = R_a/R_f or Equivalence Ratio = Actual Air Fuel Ratio/Stoichiometric 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 & Stoichiometric Air Fuel Ratio is defined as the theoretical air fuel ratio mixture of a IC engine.

How to calculate 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 is calculated using Equivalence Ratio = Actual Air Fuel Ratio/Stoichiometric Air Fuel Ratio. To calculate Equivalence ratio, you need Actual Air Fuel Ratio (R_a) & Stoichiometric Air Fuel Ratio (R_f). With our tool, you need to enter the respective value for Actual Air Fuel Ratio & Stoichiometric Air Fuel Ratio and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

Home

FREE PDFs

🔍 Search