Relative Air-Fuel Ratio Calculator

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✖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 [Actual_A/F]			+10% -10%
✖Stoichiometric air fuel ratio is defined as a mixture that contains just enough air for complete combustion of all the fuel in the mixture.ⓘ Stoichiometric Air Fuel Ratio [Stoichiometric_A/F]			+10% -10%

✖Relative Air Fuel Ratio is defined as the ratio of actual fuel-air ratio to the Stoichiometric fuel-air ratio.ⓘ Relative Air-Fuel Ratio [Φ]

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Formula

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Relative Air-Fuel Ratio

Formula

`"Φ" = "Actual"_{"A/F"}/"Stoichiometric"_{"A/F"}`

Example

`"1.088"="15.9936"/"14.7"`

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Relative Air-Fuel Ratio Solution

STEP 0: Pre-Calculation Summary

Formula Used

Relative Air Fuel Ratio = Actual Air Fuel Ratio/Stoichiometric Air Fuel Ratio
Φ = Actual_A/F/Stoichiometric_A/F
This formula uses 3 Variables

Variables Used

Relative Air Fuel Ratio - Relative Air Fuel Ratio is defined as the ratio of actual fuel-air ratio to the Stoichiometric fuel-air 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.
Stoichiometric Air Fuel Ratio - Stoichiometric air fuel ratio is defined as a mixture that contains just enough air for complete combustion of all the fuel in the mixture.

STEP 1: Convert Input(s) to Base Unit

Actual Air Fuel Ratio: 15.9936 --> No Conversion Required
Stoichiometric Air Fuel Ratio: 14.7 --> No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

Φ = Actual_A/F/Stoichiometric_A/F --> 15.9936/14.7

Evaluating ... ...

Φ = 1.088

STEP 3: Convert Result to Output's Unit

1.088 --> No Conversion Required

FINAL ANSWER

1.088 <-- Relative Air Fuel Ratio

(Calculation completed in 00.004 seconds)

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Credits

Created by Syed Adnan

Ramaiah University of Applied Sciences (RUAS), bangalore

Syed Adnan has created this Calculator and 200+ more calculators!

Verified by Kartikay Pandit

National Institute Of Technology (NIT), Hamirpur

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

< 18 Air-Standard Cycles Calculators

Mean Effective Pressure in Dual Cycle

Go Mean Effective Pressure of Dual Cycle = Pressure at Start of Isentropic Compression*(Compression Ratio^Heat Capacity Ratio*((Pressure Ratio in Dual Cycle-1)+Heat Capacity Ratio*Pressure Ratio in Dual Cycle*(Cut-off Ratio-1))-Compression Ratio*(Pressure Ratio in Dual Cycle*Cut-off Ratio^Heat Capacity Ratio-1))/((Heat Capacity Ratio-1)*(Compression Ratio-1))

Thermal Efficiency of Stirling Cycle given Heat Exchanger Effectiveness

Go Thermal Efficiency of Stirling Cycle = 100*(([R]*ln(Compression Ratio)*(Final Temperature-Initial Temperature))/(Universal Gas Constant*Final Temperature*ln(Compression Ratio)+Molar Specific Heat Capacity at Constant Volume*(1-Effectiveness of Heat Exchanger)*(Final Temperature-Initial Temperature)))

Work Output for Dual Cycle

Go Work Output of Dual Cycle = Pressure at Start of Isentropic Compression*Volume at Start of Isentropic Compression*(Compression Ratio^(Heat Capacity Ratio-1)*(Heat Capacity Ratio*Pressure Ratio*(Cut-off Ratio-1)+(Pressure Ratio-1))-(Pressure Ratio*Cut-off Ratio^(Heat Capacity Ratio)-1))/(Heat Capacity Ratio-1)

Work Output for Diesel Cycle

Go Work Output of Diesel Cycle = Pressure at Start of Isentropic Compression*Volume at Start of Isentropic Compression*(Compression Ratio^(Heat Capacity Ratio-1)*(Heat Capacity Ratio*(Cut-off Ratio-1)-Compression Ratio^(1-Heat Capacity Ratio)*(Cut-off Ratio^(Heat Capacity Ratio)-1)))/(Heat Capacity Ratio-1)

Mean Effective Pressure in Diesel Cycle

Go Mean Effective Pressure of Diesel Cycle = Pressure at Start of Isentropic Compression*(Heat Capacity Ratio*Compression Ratio^Heat Capacity Ratio*(Cut-off Ratio-1)-Compression Ratio*(Cut-off Ratio^Heat Capacity Ratio-1))/((Heat Capacity Ratio-1)*(Compression Ratio-1))

Thermal Efficiency of Dual Cycle

Go Thermal Efficiency of Dual Cycle = 100*(1-1/(Compression Ratio^(Heat Capacity Ratio-1))*((Pressure Ratio in Dual Cycle*Cut-off Ratio^Heat Capacity Ratio-1)/(Pressure Ratio in Dual Cycle-1+Pressure Ratio in Dual Cycle*Heat Capacity Ratio*(Cut-off Ratio-1))))

Mean Effective Pressure in Otto Cycle

Go Mean Effective Pressure of Otto Cycle = Pressure at Start of Isentropic Compression*Compression Ratio*(((Compression Ratio^(Heat Capacity Ratio-1)-1)*(Pressure Ratio-1))/((Compression Ratio-1)*(Heat Capacity Ratio-1)))

Thermal Efficiency of Atkinson Cycle

Go Thermal Efficiency of Atkinson Cycle = 100*(1-Heat Capacity Ratio*((Expansion Ratio-Compression Ratio)/(Expansion Ratio^(Heat Capacity Ratio)-Compression Ratio^(Heat Capacity Ratio))))

Work Output for Otto Cycle

Go Work Output of Otto Cycle = Pressure at Start of Isentropic Compression*Volume at Start of Isentropic Compression*((Pressure Ratio-1)*(Compression Ratio^(Heat Capacity Ratio-1)-1))/(Heat Capacity Ratio-1)

Air Standard Efficiency for Diesel Engines

Go Air Standard Efficiency of Diesel Cycle = 100*(1-1/(Compression Ratio^(Heat Capacity Ratio-1))*(Cut-off Ratio^(Heat Capacity Ratio)-1)/(Heat Capacity Ratio*(Cut-off Ratio-1)))

Thermal Efficiency of Diesel Cycle

Go Thermal Efficiency of Diesel Cycle = 100*(1-1/Compression Ratio^(Heat Capacity Ratio-1)*(Cut-off Ratio^Heat Capacity Ratio-1)/(Heat Capacity Ratio*(Cut-off Ratio-1)))

Thermal Efficiency of Lenoir Cycle

Go Thermal Efficiency of Lenoir Cycle = 100*(1-Heat Capacity Ratio*((Pressure Ratio^(1/Heat Capacity Ratio)-1)/(Pressure Ratio-1)))

Thermal Efficiency of Ericsson Cycle

Go Thermal Efficiency of Ericsson Cycle = (Higher Temperature-Lower Temperature)/(Higher Temperature)

Air Standard Efficiency for Petrol engines

Go Air Standard Efficiency of Otto Cycle = 100*(1-1/(Compression Ratio^(Heat Capacity Ratio-1)))

Relative Air-Fuel Ratio

Go Relative Air Fuel Ratio = Actual Air Fuel Ratio/Stoichiometric Air Fuel Ratio

Air Standard Efficiency given Relative Efficiency

Go Air Standard Efficiency = Indicated Thermal Efficiency/Relative Efficiency

Thermal Efficiency of Otto Cycle

Go OTE = 1-1/Compression Ratio^(Heat Capacity Ratio-1)

Actual Air Fuel Ratio

Go Actual Air Fuel Ratio = Mass of Air/Mass of Fuel

Relative Air-Fuel Ratio Formula

Relative Air Fuel Ratio = Actual Air Fuel Ratio/Stoichiometric Air Fuel Ratio
Φ = Actual_A/F/Stoichiometric_A/F

What is relative air fuel ratio?

Air-fuel ratio is the ratio of mass of air to the mass of fuel in air-fuel mixture while the fuel-air ratio is the ratio of mass of fuel to the mass of air in air-fuel mixture.
Relative fuel-air ratio can be defined as the ratio of actual fuel-air ratio to the Stoichiometric fuel-air ratio.

How to Calculate Relative Air-Fuel Ratio?

Relative Air-Fuel Ratio calculator uses Relative Air Fuel Ratio = Actual Air Fuel Ratio/Stoichiometric Air Fuel Ratio to calculate the Relative Air Fuel Ratio, The Relative air-fuel ratio formula is defined as the ratio of actual fuel-air ratio to the Stoichiometric fuel-air ratio. Relative Air Fuel Ratio is denoted by Φ symbol.

How to calculate Relative Air-Fuel Ratio using this online calculator? To use this online calculator for Relative Air-Fuel Ratio, enter Actual Air Fuel Ratio (Actual_A/F) & Stoichiometric Air Fuel Ratio (Stoichiometric_A/F) and hit the calculate button. Here is how the Relative Air-Fuel Ratio calculation can be explained with given input values -> 1.088 = 15.9936/14.7.

FAQ

What is Relative Air-Fuel Ratio?

The Relative air-fuel ratio formula is defined as the ratio of actual fuel-air ratio to the Stoichiometric fuel-air ratio and is represented as Φ = Actual_A/F/Stoichiometric_A/F or Relative Air Fuel 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 a mixture that contains just enough air for complete combustion of all the fuel in the mixture.

How to calculate Relative Air-Fuel Ratio?

The Relative air-fuel ratio formula is defined as the ratio of actual fuel-air ratio to the Stoichiometric fuel-air ratio is calculated using Relative Air Fuel Ratio = Actual Air Fuel Ratio/Stoichiometric Air Fuel Ratio. To calculate Relative Air-Fuel Ratio, you need Actual Air Fuel Ratio (Actual_A/F) & Stoichiometric Air Fuel Ratio (Stoichiometric_A/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.

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