Intake air density Calculator

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Engine Performance Parameters

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Design of IC Engine Components

Fuel Injection in IC Engine

Fundamentals of IC Engine

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For 4 Stroke Engine

For 2 Stroke Engine

✖Intake air pressure is defined as the pressure of the air drawn at intake manifold.ⓘ Intake air pressure [P_a]			+10% -10%
✖Intake air temperature is defined as the temperature of the drawn air at inlet manifold.ⓘ Intake air temperature [T_a]			+10% -10%

✖Air density at intake is defined as the density of air recorded at intake manifold at atmospheric pressure and room temperature.ⓘ Intake air density [ρ_a]

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Formula

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Intake air density

Formula

`"ρ"_{"a"} = "P"_{"a"}/("[R]"*"T"_{"a"})`

Example

`"57.63851kg/m³"="1.5e5Pa"/("[R]"*"313K")`

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Intake air density Solution

STEP 0: Pre-Calculation Summary

Formula Used

Air density at intake = Intake air pressure/([R]*Intake air temperature)
ρ_a = P_a/([R]*T_a)
This formula uses 1 Constants, 3 Variables

Constants Used

[R] - Universal gas constant Value Taken As 8.31446261815324

Variables Used

Air density at intake - (Measured in Kilogram per Cubic Meter) - Air density at intake is defined as the density of air recorded at intake manifold at atmospheric pressure and room temperature.
Intake air pressure - (Measured in Pascal) - Intake air pressure is defined as the pressure of the air drawn at intake manifold.
Intake air temperature - (Measured in Kelvin) - Intake air temperature is defined as the temperature of the drawn air at inlet manifold.

STEP 1: Convert Input(s) to Base Unit

Intake air pressure: 150000 Pascal --> 150000 Pascal No Conversion Required
Intake air temperature: 313 Kelvin --> 313 Kelvin No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

ρ_a = P_a/([R]*T_a) --> 150000/([R]*313)

Evaluating ... ...

ρ_a = 57.6385088064182

STEP 3: Convert Result to Output's Unit

57.6385088064182 Kilogram per Cubic Meter --> No Conversion Required

FINAL ANSWER

57.6385088064182 ≈ 57.63851 Kilogram per Cubic Meter <-- Air density at intake

(Calculation completed in 00.004 seconds)

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Credits

Created by Syed Adnan

Ramaiah University of Applied Sciences (RUAS), bangalore

Syed Adnan has created this Calculator and 200+ more calculators!

Verified by Kartikay Pandit

National Institute Of Technology (NIT), Hamirpur

Kartikay Pandit has verified this Calculator and 400+ more calculators!

< 24 For 4 Stroke Engine Calculators

Volumetric efficiency of IC engine

Go Volumetric efficiency of IC engine = (Air Mass Flow Rate*Crankshaft revolutions per power stroke)/(Air density at intake*Theoretical volume of engine*Engine speed in rps)

Rate of heat conduction of engine wall

Go Rate of Heat Conduction of Engine Wall = ((-Thermal conductivity of material)*Surface Area of Engine Wall*Temperature Difference across Engine Wall)/Thickness of Engine Wall

Brake power measured with dynamo meter

Go Brake power measured with dynamo meter = (pi*Pulley diameter*(Engine speed in rps*60)*(Dead weight-Spring scale reading))/60

Indicated Power of Four-stroke Engine

Go Indicated Power = (Number of Cylinders*Mean Effective Pressure*Stroke Length*Area of Cross Section*(Engine Speed))/(2)

Volumetric Efficiency for 4S engines

Go Volumetric Efficiency = ((2*Air Mass Flow Rate)/(Air density at intake*Piston Swept Volume*(Engine Speed)))*100

Brake Mean Effective Pressure of 4S Engines given Brake power

Go Brake Mean Effective Pressure = (2*Brake Power)/(Stroke Length*Area of Cross Section*(Engine Speed))

Work done per cycle in ic engine

Go Work done per cycle in ic engine = (Indicated engine power*Crankshaft revolutions per power stroke)/Engine Speed in rpm

Fuel conversion efficiency

Go Fuel conversion efficiency = Work done per cycle in ic engine/(Mass of fuel added per cycle*Heating value of the fuel)

Combustion efficiency

Go Combustion efficiency = Heat added by combustion per cycle/(Mass of fuel added per cycle*Heating value of the fuel)

Intake air mass of engine cylinder

Go Mass of air at intake = (Air Mass Flow Rate*Crankshaft revolutions per power stroke)/Engine Speed in rpm

Bmep given engine torque

Go Bmep = (2*pi*Engine Torque*Engine Speed)/Mean Piston Speed

Displaced volume in engine cylinder

Go Displaced volume = (Piston stroke*pi*(Engine cylinder bore in meter^2))/4

Intake air density

Go Air density at intake = Intake air pressure/([R]*Intake air temperature)

Thermal efficiency of IC engine

Go Thermal efficiency of ic engine = Work done per cycle in ic engine/Heat added by combustion per cycle

Volumetric efficiency of IC engine given actual volume of engine cylinder

Go Volumetric efficiency of IC engine = Actual volume of intake air/Theoretical volume of engine

Connecting rod length to crank radius ratio

Go Connecting rod length to crank radius ratio = Connecting rod length/Crank Radius of Engine

Ratio of cylinder bore to piston stroke

Go Connecting rod length to crank radius ratio = Connecting rod length/Crank Radius of Engine

Total cylinder volume of IC engine

Go Total volume of an engine = Total number of cylinders*Total volume of engine cylinder

Fuel conversion efficiency given thermal conversion efficiency

Go Fuel conversion efficiency = Combustion efficiency*Thermal conversion efficiency

Frictional power of engine

Go Frictional power of engine = Indicated Power of Engine-Brake power of engine

Actual intake air volume per cylinder

Go Actual volume of intake air = Mass of air at intake/Air density at intake

Horsepower of engine

Go Horsepower of engine = (Engine Torque*Engine RPM)/5252

Indicated mean effective pressure given mechanical efficiency

Go Imep = Bmep/Mechanical efficiency of ic engine

Frictional mean effective pressure

Go Fmep = Imep-Bmep

Intake air density Formula

Air density at intake = Intake air pressure/([R]*Intake air temperature)
ρ_a = P_a/([R]*T_a)

What is intake air density?

Intake air density is the density of air recorded at intake manifold at atmospheric pressure and room temperature.

How to Calculate Intake air density?

Intake air density calculator uses Air density at intake = Intake air pressure/([R]*Intake air temperature) to calculate the Air density at intake, The Intake air density formula is defined as the density of air recorded at intake manifold at atmospheric pressure and room temperature. Air density at intake is denoted by ρ_a symbol.

How to calculate Intake air density using this online calculator? To use this online calculator for Intake air density, enter Intake air pressure (P_a) & Intake air temperature (T_a) and hit the calculate button. Here is how the Intake air density calculation can be explained with given input values -> 57.63851 = 150000/([R]*313).

FAQ

What is Intake air density?

The Intake air density formula is defined as the density of air recorded at intake manifold at atmospheric pressure and room temperature and is represented as ρ_a = P_a/([R]*T_a) or Air density at intake = Intake air pressure/([R]*Intake air temperature). Intake air pressure is defined as the pressure of the air drawn at intake manifold & Intake air temperature is defined as the temperature of the drawn air at inlet manifold.

How to calculate Intake air density?

The Intake air density formula is defined as the density of air recorded at intake manifold at atmospheric pressure and room temperature is calculated using Air density at intake = Intake air pressure/([R]*Intake air temperature). To calculate Intake air density, you need Intake air pressure (P_a) & Intake air temperature (T_a). With our tool, you need to enter the respective value for Intake air pressure & Intake air temperature and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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