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Thermal efficiency of turbojet engine Formula

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Turbojet Thermal Efficiency signifies the ratio of the work output of a turbojet engine to the heat input from fuel. Check FAQs

η th = \frac{P}{m f \cdot Q}

η_th - Turbojet Thermal Efficiency?P - Propulsive Power?m_f - Fuel Flow Rate?Q - Fuel Calorific Value?

Thermal efficiency of turbojet engine Example

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Here is how the Thermal efficiency of turbojet engine equation looks like with Values.

Here is how the Thermal efficiency of turbojet engine equation looks like with Units.

Here is how the Thermal efficiency of turbojet engine equation looks like.

0.6827 = \frac{980}{0.033 \cdot 43500}

0.6827 = \frac{980kW}{0.033kg/s \cdot 43500kJ/kg}

0.6827 = \frac{980}{0.033 \cdot 43500}

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Thermal efficiency of turbojet engine Solution

Follow our step by step solution on how to calculate Thermal efficiency of turbojet engine?

FIRST Step Consider the formula

η th = \frac{P}{m f \cdot Q}

Next Step Substitute values of Variables

∴

η th = \frac{980kW}{0.033kg/s \cdot 43500kJ/kg}

Next Step Convert Units

∴

η th = \frac{980000W}{0.033kg/s \cdot 4.4E+7J/kg}

Next Step Prepare to Evaluate

∴

η th = \frac{980000}{0.033 \cdot 4.4E+7}

Next Step Evaluate

∴

η th = 0.682688958551028

LAST Step Rounding Answer

∴

η th = 0.6827

Thermal efficiency of turbojet engine Formula Elements

Variables

Turbojet Thermal Efficiency

Turbojet Thermal Efficiency signifies the ratio of the work output of a turbojet engine to the heat input from fuel.

Symbol: η_th

Measurement: NAUnit: Unitless

Note: Value should be between 0 to 1.

Formulas to find Turbojet Thermal Efficiency

Propulsive Power

Propulsive Power refers to the power generated by a propulsion system, crucial in measuring the engine's ability to produce thrust and propel an object or vehicle forward.

Symbol: P

Measurement: PowerUnit: kW

Note: Value should be greater than 0.

Formulas to find Propulsive Power

Fuel Flow Rate

Fuel Flow Rate represents the rate at which fuel is consumed or supplied over a specified period, crucial for monitoring fuel consumption and efficiency in various engines or systems.

Symbol: m_f

Measurement: Mass Flow RateUnit: kg/s

Note: Value can be positive or negative.

Formulas to find Fuel Flow Rate

Fuel Calorific Value

Fuel Calorific Value denotes the amount of heat energy released per unit mass of fuel upon complete combustion.

Symbol: Q

Measurement: Specific EnergyUnit: kJ/kg

Note: Value can be positive or negative.

Formulas to find Fuel Calorific Value

Other formulas in Turbojets category

Go Mass Flow Rate of Exhaust Gases

m total = m a + m f

Go Mass Flow Rate of Exhaust Gases given Fuel Air Ratio

m total = m a \cdot (1 + f)

Go Turbojet Gross Thrust

T G = m a \cdot (1 + f) \cdot V e + (p e - p ∞) \cdot A e

Go Nozzle Exit Area in Turbojet

A e = \frac{T - m a \cdot (1 + f) \cdot (V e - V)}{p e - p ∞}

How to Evaluate Thermal efficiency of turbojet engine?

Thermal efficiency of turbojet engine evaluator uses Turbojet Thermal Efficiency = Propulsive Power/(Fuel Flow Rate*Fuel Calorific Value) to evaluate the Turbojet Thermal Efficiency, Thermal efficiency of turbojet engine is a measure of the ratio of the power output of the engine to the energy released by the fuel, describing the ability of the engine to convert fuel energy into useful mechanical energy. Turbojet Thermal Efficiency is denoted by η_th symbol.

How to evaluate Thermal efficiency of turbojet engine using this online evaluator? To use this online evaluator for Thermal efficiency of turbojet engine, enter Propulsive Power (P), Fuel Flow Rate (m_f) & Fuel Calorific Value (Q) and hit the calculate button.

FAQs on Thermal efficiency of turbojet engine

What is the formula to find Thermal efficiency of turbojet engine?

The formula of Thermal efficiency of turbojet engine is expressed as Turbojet Thermal Efficiency = Propulsive Power/(Fuel Flow Rate*Fuel Calorific Value). Here is an example- 0.682689 = 980000/(0.033*43500000).

How to calculate Thermal efficiency of turbojet engine?

With Propulsive Power (P), Fuel Flow Rate (m_f) & Fuel Calorific Value (Q) we can find Thermal efficiency of turbojet engine using the formula - Turbojet Thermal Efficiency = Propulsive Power/(Fuel Flow Rate*Fuel Calorific Value).

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