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Theoretical Propulsive Efficiency Formula

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Efficiency of Jet is an electric motor is defined as the ratio of usable shaft power to electric input power. Check FAQs

η = \frac{2}{1 + (\frac{V}{V f})}

η - Efficiency of Jet?V - Absolute Velocity of Issuing Jet?V_f - Flow Velocity?

Theoretical Propulsive Efficiency Example

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Here is how the Theoretical Propulsive Efficiency equation looks like with Values.

Here is how the Theoretical Propulsive Efficiency equation looks like with Units.

Here is how the Theoretical Propulsive Efficiency equation looks like.

0.9091 = \frac{2}{1 + (\frac{6}{5})}

0.9091 = \frac{2}{1 + (\frac{6m/s}{5m/s})}

0.9091 = \frac{2}{1 + (\frac{6}{5})}

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Theoretical Propulsive Efficiency Solution

Follow our step by step solution on how to calculate Theoretical Propulsive Efficiency?

FIRST Step Consider the formula

η = \frac{2}{1 + (\frac{V}{V f})}

Next Step Substitute values of Variables

∴

η = \frac{2}{1 + (\frac{6m/s}{5m/s})}

Next Step Prepare to Evaluate

∴

η = \frac{2}{1 + (\frac{6}{5})}

Next Step Evaluate

∴

η = 0.909090909090909

LAST Step Rounding Answer

∴

η = 0.9091

Theoretical Propulsive Efficiency Formula Elements

Variables

Efficiency of Jet

Efficiency of Jet is an electric motor is defined as the ratio of usable shaft power to electric input power.

Symbol: η

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Efficiency of Jet

Absolute Velocity of Issuing Jet

Absolute Velocity of Issuing Jet is actual velocity of jet used in propeller.

Symbol: V

Measurement: SpeedUnit: m/s

Note: Value should be greater than 0.

Formulas to find Absolute Velocity of Issuing Jet

Flow Velocity

Flow Velocity is the velocity of the flow of any fluid.

Symbol: V_f

Measurement: SpeedUnit: m/s

Note: Value can be positive or negative.

Formulas to find Flow Velocity

Other formulas in Momentum Theory of Propellers category

Go Thrust on Propeller

Ft = (\frac{π}{4}) \cdot (D^{2}) \cdot dP

Go Diameter of Propeller given Thrust on Propeller

D = \sqrt{(\frac{4}{π}) \cdot \frac{Ft}{dP}}

Go Flow Velocity given Thrust on Propeller

V f = - (\frac{Ft}{ρ Water \cdot q flow}) + V

Go Rate of Flow through Propeller

Q = (\frac{π}{8}) \cdot (D^{2}) \cdot (V + V f)

How to Evaluate Theoretical Propulsive Efficiency?

Theoretical Propulsive Efficiency evaluator uses Efficiency of Jet = 2/(1+(Absolute Velocity of Issuing Jet/Flow Velocity)) to evaluate the Efficiency of Jet, The Theoretical Propulsive Efficiency is defined as efficiency without taking into account the losses of the system. Efficiency of Jet is denoted by η symbol.

How to evaluate Theoretical Propulsive Efficiency using this online evaluator? To use this online evaluator for Theoretical Propulsive Efficiency, enter Absolute Velocity of Issuing Jet (V) & Flow Velocity (V_f) and hit the calculate button.

FAQs on Theoretical Propulsive Efficiency

What is the formula to find Theoretical Propulsive Efficiency?

The formula of Theoretical Propulsive Efficiency is expressed as Efficiency of Jet = 2/(1+(Absolute Velocity of Issuing Jet/Flow Velocity)). Here is an example- 0.769231 = 2/(1+(6/5)).

How to calculate Theoretical Propulsive Efficiency?

With Absolute Velocity of Issuing Jet (V) & Flow Velocity (V_f) we can find Theoretical Propulsive Efficiency using the formula - Efficiency of Jet = 2/(1+(Absolute Velocity of Issuing Jet/Flow Velocity)).

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