Overall Efficiency of Propulsive System Calculator

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Jet Propulsion

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Efficiency Metrics

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✖Thermal efficiency is a dimensionless performance measure of a device that uses thermal energy, such as an internal combustion engine, a steam turbine or a steam engine.ⓘ Thermal Efficiency [η_th]			+10% -10%
✖Efficiency of transmission is the ratio of output of transmission to input of transmission.ⓘ Efficiency of Transmission [η_transmission]			+10% -10%
✖Propulsive efficiency is the efficiency with which the energy contained in a fuel is converted into kinetic energy of the vehicle.ⓘ Propulsive Efficiency [η_propulsive]			+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 of Propulsive System [η_o]

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Overall Efficiency of Propulsive System

Formula

`"η"_{"o"} = "η"_{"th"}*"η"_{"transmission"}*"η"_{"propulsive"}`

Example

`"0.409728"="0.64"*"0.97"*"0.66"`

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Overall Efficiency of Propulsive System Solution

STEP 0: Pre-Calculation Summary

Formula Used

Overall Efficiency = Thermal Efficiency*Efficiency of Transmission*Propulsive Efficiency
η_o = η_th*η_transmission*η_propulsive
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.
Thermal Efficiency - Thermal efficiency is a dimensionless performance measure of a device that uses thermal energy, such as an internal combustion engine, a steam turbine or a steam engine.
Efficiency of Transmission - Efficiency of transmission is the ratio of output of transmission to input of transmission.
Propulsive Efficiency - Propulsive efficiency is the efficiency with which the energy contained in a fuel is converted into kinetic energy of the vehicle.

STEP 1: Convert Input(s) to Base Unit

Thermal Efficiency: 0.64 --> No Conversion Required
Efficiency of Transmission: 0.97 --> No Conversion Required
Propulsive Efficiency: 0.66 --> No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

η_o = η_th*η_transmission*η_propulsive --> 0.64*0.97*0.66

Evaluating ... ...

η_o = 0.409728

STEP 3: Convert Result to Output's Unit

0.409728 --> No Conversion Required

FINAL ANSWER

0.409728 <-- Overall Efficiency

(Calculation completed in 00.004 seconds)

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Credits

Created by Chilvera Bhanu Teja

Institute of Aeronautical Engineering (IARE), Hyderabad

Chilvera Bhanu Teja has created this Calculator and 300+ more calculators!

Verified by Sagar S Kulkarni

Dayananda Sagar College of Engineering (DSCE), Bengaluru

Sagar S Kulkarni has verified this Calculator and 200+ more calculators!

< 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 of Propulsive System Formula

Overall Efficiency = Thermal Efficiency*Efficiency of Transmission*Propulsive Efficiency
η_o = η_th*η_transmission*η_propulsive

What is overall efficiency?

Overall efficiency of a propulsive device is the ratio of the useful work done to the chemical energy supplied in the form of fuel.

How to Calculate Overall Efficiency of Propulsive System?

Overall Efficiency of Propulsive System calculator uses Overall Efficiency = Thermal Efficiency*Efficiency of Transmission*Propulsive Efficiency to calculate the Overall Efficiency, The Overall efficiency of propulsive system formula is defined as the product of thermal efficiency, transmission efficiency, and propulsive efficiency. Overall Efficiency is denoted by η_o symbol.

How to calculate Overall Efficiency of Propulsive System using this online calculator? To use this online calculator for Overall Efficiency of Propulsive System, enter Thermal Efficiency (η_th), Efficiency of Transmission (η_transmission) & Propulsive Efficiency (η_propulsive) and hit the calculate button. Here is how the Overall Efficiency of Propulsive System calculation can be explained with given input values -> 0.409728 = 0.64*0.97*0.66.

FAQ

What is Overall Efficiency of Propulsive System?

The Overall efficiency of propulsive system formula is defined as the product of thermal efficiency, transmission efficiency, and propulsive efficiency and is represented as η_o = η_th*η_transmission*η_propulsive or Overall Efficiency = Thermal Efficiency*Efficiency of Transmission*Propulsive Efficiency. Thermal efficiency is a dimensionless performance measure of a device that uses thermal energy, such as an internal combustion engine, a steam turbine or a steam engine, Efficiency of transmission is the ratio of output of transmission to input of transmission & Propulsive efficiency is the efficiency with which the energy contained in a fuel is converted into kinetic energy of the vehicle.

How to calculate Overall Efficiency of Propulsive System?

The Overall efficiency of propulsive system formula is defined as the product of thermal efficiency, transmission efficiency, and propulsive efficiency is calculated using Overall Efficiency = Thermal Efficiency*Efficiency of Transmission*Propulsive Efficiency. To calculate Overall Efficiency of Propulsive System, you need Thermal Efficiency (η_th), Efficiency of Transmission (η_transmission) & Propulsive Efficiency (η_propulsive). With our tool, you need to enter the respective value for Thermal Efficiency, Efficiency of Transmission & Propulsive Efficiency 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 Thermal Efficiency, Efficiency of Transmission & Propulsive Efficiency. We can use 1 other way(s) to calculate the same, which is/are as follows -

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

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