Overall Efficiency given Specific Fuel Consumption Calculator

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Jet Propulsion

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Thermodynamics and Governing Equations

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Efficiency Metrics

Thrust Generation

✖Flight Speed refers to the velocity at which an aircraft moves through the air.ⓘ Flight Speed [V]			+10% -10%
✖Thrust-specific fuel consumption (TSFC) is the fuel efficiency of an engine design with respect to thrust output.ⓘ Thrust-Specific Fuel Consumption [TSFC]			+10% -10%
✖Fuel Calorific Value denotes the amount of heat energy released per unit mass of fuel upon complete combustion.ⓘ Fuel Calorific Value [Q]			+10% -10%

✖Overall Efficiency is the efficiency of the entire system from the initial input to the final output including propulsive, thermal, and transmission efficiency.ⓘ Overall Efficiency given Specific Fuel Consumption [η_o]

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Formula

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Overall Efficiency given Specific Fuel Consumption

Formula

`"η"_{"o"} = "V"/("TSFC"*"Q")`

Example

`"1.1E^-5"="111m/s"/("851kg/h/N"*"43510kJ/kg")`

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Overall Efficiency given Specific Fuel Consumption Solution

STEP 0: Pre-Calculation Summary

Formula Used

Overall Efficiency = Flight Speed/(Thrust-Specific Fuel Consumption*Fuel Calorific Value)
η_o = V/(TSFC*Q)
This formula uses 4 Variables

Variables Used

Overall Efficiency - Overall Efficiency is the efficiency of the entire system from the initial input to the final output including propulsive, thermal, and transmission efficiency.
Flight Speed - (Measured in Meter per Second) - Flight Speed refers to the velocity at which an aircraft moves through the air.
Thrust-Specific Fuel Consumption - (Measured in Kilogram per Second per Newton) - Thrust-specific fuel consumption (TSFC) is the fuel efficiency of an engine design with respect to thrust output.
Fuel Calorific Value - (Measured in Joule per Kilogram) - Fuel Calorific Value denotes the amount of heat energy released per unit mass of fuel upon complete combustion.

STEP 1: Convert Input(s) to Base Unit

Flight Speed: 111 Meter per Second --> 111 Meter per Second No Conversion Required
Thrust-Specific Fuel Consumption: 851 Kilogram per Hour per Newton --> 0.236388888888889 Kilogram per Second per Newton (Check conversion here)
Fuel Calorific Value: 43510 Kilojoule per Kilogram --> 43510000 Joule per Kilogram (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

η_o = V/(TSFC*Q) --> 111/(0.236388888888889*43510000)

Evaluating ... ...

η_o = 1.07921217511217E-05

STEP 3: Convert Result to Output's Unit

1.07921217511217E-05 --> No Conversion Required

FINAL ANSWER

1.07921217511217E-05 ≈ 1.1E-5 <-- Overall Efficiency

(Calculation completed in 00.020 seconds)

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Created by Shreyash

Rajiv Gandhi Institute of Technology (RGIT), Mumbai

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National Institute Of Technology (NIT), Hamirpur

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< 12 Efficiency Metrics Calculators

Net work output in simple gas turbine cycle

Go Net Work Output = Specific Heat Capacity at Constant Pressure*((Temperature at Inlet of Turbine-Temperature at Exit of Turbine)-(Temperature at Exit of Compressor-Temperature at Inlet of Compressor))

Change in Kinetic Energy of Jet Engine

Go Change in Kinetic Energy = (((Mass Flow Rate+Fuel Flow Rate)*Exit Velocity^2)-(Mass Flow Rate*Flight Speed^2))/2

Propulsive power

Go Propulsive Power = 1/2*((Mass Flow Rate+Fuel Flow Rate)*Exit Velocity^2-(Mass Flow Rate*Flight Speed^2))

Thermal Efficiency of Jet Engines given Effective Speed Ratio

Go Thermal Efficiency = (Exit Velocity^2*(1-Effective Speed Ratio^2))/(2*Fuel Air Ratio*Fuel Calorific Value)

Overall Efficiency given Specific Fuel Consumption

Go Overall Efficiency = Flight Speed/(Thrust-Specific Fuel Consumption*Fuel Calorific Value)

Overall Efficiency of Propulsive System

Go Overall Efficiency = Thermal Efficiency*Efficiency of Transmission*Propulsive Efficiency

Propulsive efficiency given aircraft velocity

Go Propulsive Efficiency = (2*Flight Speed)/(Exit Velocity+Flight Speed)

Transmission Efficiency given Output and Input of Transmission

Go Efficiency of Transmission = Transmission Output Power/Transmission Input Power

Propulsive Efficiency given Effective Speed Ratio

Go Propulsive Efficiency = (2*Effective Speed Ratio)/(1+Effective Speed Ratio)

Isentropic Efficiency of Expansion Machine

Go Turbine Efficiency = Actual Work/Isentropic Work Output

Propulsive efficiency

Go Propulsive Efficiency = Thrust Power/Propulsive Power

Effective speed ratio

Go Effective Speed Ratio = Flight Speed/Exit Velocity

Overall Efficiency given Specific Fuel Consumption Formula

Overall Efficiency = Flight Speed/(Thrust-Specific Fuel Consumption*Fuel Calorific Value)
η_o = V/(TSFC*Q)

Specific Fuel Consumption(SFC)

SFC is a mathematical measure of how effectively an engine turns fuel into power. It is the amount of gasoline used per unit of time necessary to generate a specific engine output.

How to Calculate Overall Efficiency given Specific Fuel Consumption?

Overall Efficiency given Specific Fuel Consumption calculator uses Overall Efficiency = Flight Speed/(Thrust-Specific Fuel Consumption*Fuel Calorific Value) to calculate the Overall Efficiency, The Overall Efficiency given Specific Fuel Consumption formula defines the production of useful work per unit of energy from fuel in a system for a given specific fuel consumption value. Overall Efficiency is denoted by η_o symbol.

How to calculate Overall Efficiency given Specific Fuel Consumption using this online calculator? To use this online calculator for Overall Efficiency given Specific Fuel Consumption, enter Flight Speed (V), Thrust-Specific Fuel Consumption (TSFC) & Fuel Calorific Value (Q) and hit the calculate button. Here is how the Overall Efficiency given Specific Fuel Consumption calculation can be explained with given input values -> 3.1E-6 = 111/(0.236388888888889*43510000).

FAQ

What is Overall Efficiency given Specific Fuel Consumption?

The Overall Efficiency given Specific Fuel Consumption formula defines the production of useful work per unit of energy from fuel in a system for a given specific fuel consumption value and is represented as η_o = V/(TSFC*Q) or Overall Efficiency = Flight Speed/(Thrust-Specific Fuel Consumption*Fuel Calorific Value). Flight Speed refers to the velocity at which an aircraft moves through the air, Thrust-specific fuel consumption (TSFC) is the fuel efficiency of an engine design with respect to thrust output & Fuel Calorific Value denotes the amount of heat energy released per unit mass of fuel upon complete combustion.

How to calculate Overall Efficiency given Specific Fuel Consumption?

The Overall Efficiency given Specific Fuel Consumption formula defines the production of useful work per unit of energy from fuel in a system for a given specific fuel consumption value is calculated using Overall Efficiency = Flight Speed/(Thrust-Specific Fuel Consumption*Fuel Calorific Value). To calculate Overall Efficiency given Specific Fuel Consumption, you need Flight Speed (V), Thrust-Specific Fuel Consumption (TSFC) & Fuel Calorific Value (Q). With our tool, you need to enter the respective value for Flight Speed, Thrust-Specific Fuel Consumption & Fuel Calorific Value and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate Overall Efficiency?

In this formula, Overall Efficiency uses Flight Speed, Thrust-Specific Fuel Consumption & Fuel Calorific Value. We can use 1 other way(s) to calculate the same, which is/are as follows -

Overall Efficiency = Thermal Efficiency*Efficiency of Transmission*Propulsive Efficiency

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