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Thermal Efficiency of Propeller Engines Formula

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

η th = \frac{BP}{m f \cdot Q}

η_th - Thermal Efficiency?BP - Break Power?m_f - Fuel Flow Rate?Q - Fuel Calorific Value?

Thermal Efficiency of Propeller Engines Example

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Here is how the Thermal Efficiency of Propeller Engines equation looks like with Values.

Here is how the Thermal Efficiency of Propeller Engines equation looks like with Units.

Here is how the Thermal Efficiency of Propeller Engines equation looks like.

0.0575 = \frac{125}{0.05 \cdot 43510}

0.0575 = \frac{125kW}{0.05kg/s \cdot 43510kJ/kg}

0.0575 = \frac{125}{0.05 \cdot 43510}

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Thermal Efficiency of Propeller Engines Solution

Follow our step by step solution on how to calculate Thermal Efficiency of Propeller Engines?

FIRST Step Consider the formula

η th = \frac{BP}{m f \cdot Q}

Next Step Substitute values of Variables

∴

η th = \frac{125kW}{0.05kg/s \cdot 43510kJ/kg}

Next Step Convert Units

∴

η th = \frac{125000W}{0.05kg/s \cdot 4.4E+7J/kg}

Next Step Prepare to Evaluate

∴

η th = \frac{125000}{0.05 \cdot 4.4E+7}

Next Step Evaluate

∴

η th = 0.0574580556193978

LAST Step Rounding Answer

∴

η th = 0.0575

Thermal Efficiency of Propeller Engines Formula Elements

Variables

Thermal Efficiency

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

Symbol: η_th

Measurement: NAUnit: Unitless

Note: Value should be between 0 to 1.

Formulas to find Thermal Efficiency

Break Power

Break power is power developed at the output shaft.

Symbol: BP

Measurement: PowerUnit: kW

Note: Value can be positive or negative.

Formulas to find Break Power

Fuel Flow Rate

Fuel Flow Rate is the fuel mass flow rate.

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 should be greater than 0.

Formulas to find Fuel Calorific Value

Other formulas in Turboprops category

Go Propeller efficiency given thrust

η p = \frac{T prop \cdot V}{S p}

Go Total thrust given nozzle thrust and propeller thrust

T = T nozzle + T prop

Go Propeller Efficiency

η p = \frac{P thrust}{S p}

How to Evaluate Thermal Efficiency of Propeller Engines?

Thermal Efficiency of Propeller Engines evaluator uses Thermal Efficiency = Break Power/(Fuel Flow Rate*Fuel Calorific Value) to evaluate the Thermal Efficiency, The Thermal efficiency of propeller engines formula is defined as the ratio of break power to the product of fuel flow rate and calorific value of fuel. Thermal Efficiency is denoted by η_th symbol.

How to evaluate Thermal Efficiency of Propeller Engines using this online evaluator? To use this online evaluator for Thermal Efficiency of Propeller Engines, enter Break Power (BP), Fuel Flow Rate (m_f) & Fuel Calorific Value (Q) and hit the calculate button.

FAQs on Thermal Efficiency of Propeller Engines

What is the formula to find Thermal Efficiency of Propeller Engines?

The formula of Thermal Efficiency of Propeller Engines is expressed as Thermal Efficiency = Break Power/(Fuel Flow Rate*Fuel Calorific Value). Here is an example- 0.002394 = 125000/(fuel_flow_rate*43510000).

How to calculate Thermal Efficiency of Propeller Engines?

With Break Power (BP), Fuel Flow Rate (m_f) & Fuel Calorific Value (Q) we can find Thermal Efficiency of Propeller Engines using the formula - Thermal Efficiency = Break Power/(Fuel Flow Rate*Fuel Calorific Value).

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