Corrected Mass Flow Rate Calculator
kg/s
lb/s
kg/min
SCFM
Kelvin (K)
Celsius (°C)
Fahrenheit (°F)
Rankine (°R)
Kilopascal (kPa)
Pascal (Pa)
Bar
PSI
Atmosphere
Corrected Mass Flow Rate (ṁ_corr):
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Theta (θ = T/T_std):
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Delta (δ = P/P_std):
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About Corrected Mass Flow Rate
In turbomachinery, aerospace engineering, and gas dynamics, comparing the performance of a compressor, turbine, or nozzle across different environmental conditions is critical. The Corrected Mass Flow Rate calculation standardizes the actual mass flow to Reference Sea Level conditions (ISO Standard Day).
Without this correction, performance data gathered on a hot day at high altitude would look vastly different from data gathered on a cold day at sea level, even if the machine is operating at the same aerodynamic point.
The Calculation Formula
The standard formula used by this calculator is:
ṁ_corr = ṁ_actual × √θ / δ
Where:
- ṁ_actual: The measured physical mass flow rate.
- θ (Theta): The temperature correction factor, calculated as T_actual / T_std.
- δ (Delta): The pressure correction factor, calculated as P_actual / P_std.
Standard Sea Level conditions used are:
T_std = 288.15 Kelvin (15°C)
P_std = 101,325 Pascals (101.325 kPa or 14.696 PSI)
Why use Corrected Flow?
Corrected flow is a non-dimensionalized parameter (technically quasi-non-dimensional) that ensures Mach number similarity. If the corrected flow and corrected speed of a compressor are constant, the velocity triangles at the inlet are similar, meaning the aerodynamic performance (efficiency, pressure ratio) remains comparable regardless of the ambient temperature or pressure.
How to use this Calculator
- Enter Actual Flow: Input the mass flow rate measured by your flow meter.
- Enter Temperature: Input the total temperature at the measurement station (e.g., compressor inlet).
- Enter Pressure: Input the total pressure at the measurement station.
- Select Units: Ensure the dropdowns match your measurement units. The calculator automatically handles conversions to standard units for the calculation.