Aerospace utilities: flight conditions package, standard atmosphere model, and more.

Overview

Aerospace Utilities

About

Module that contains commonly-used aerospace utilities for problem solving.

  • Flight Condition: input altitude to compute common flight condition data. Easily swap between true airspeed, calibrated airspeed, and equivalent airspeed. Includes atmospheric data.
  • Atmosphere: input altitude to compute 1993 International Standard Atmosphere data. Additional derived quantities also included.

Author

Matthew C. Jones <[email protected]>

Installation

Install generally with:

pip install aeroutils

Or from the downloaded source code with:

pip install <path/to/aeroutils>

Usage

In an ipython notebook or a Python script, import all utilities with:

from aeroutils import *

Flight Condition Package

The flightcondition package can be used to compute and interact with common flight condition data.

Usage:

from aeroutils.flightcondition import FlightCondition
from aeroutils.units import *

# Compute flight conditions for a scalar or array of altitudes
altitudes = [0, 10e3, 33.5e3] * unit('ft')
fc = FlightCondition(altitudes, EAS=300*unit('knots'))
print(f"\nAirspeed in multiple formats: {fc}")
print(f"Even more data: {fc.tostring()}")
print(f"Access atmospheric data (see Atmosphere class): {fc.atm}")

# Or view fc formats individually:")
print(f"\nThe Mach number is {fc.mach:.5g}")
print(f"The true fc is {fc.TAS:.5g}")
print(f"The calibrated fc is {fc.CAS:.5g}")
print(f"The equivalent fc is {fc.EAS:.5g}")

# Define flight condition with Mach number, TAS, CAS, or EAS:")
fc = FlightCondition(altitudes, mach=0.4535*dimless)
fc = FlightCondition(altitudes, TAS=300*unit('knots'))
fc = FlightCondition(altitudes, CAS=300*unit('knots'))
fc = FlightCondition(altitudes, EAS=300*unit('knots'))

# Compute flight condition data based on input length scale
ell = 5 * unit('ft')
print(f"\nThe Reynolds number is {fc.reynolds_number(ell):.5g}")
print(f"The Reynolds number per unit length is "
    f"{fc.reynolds_number_by_unit_length('in'):.5g}")

# Use unit functionality to convert dimensions as desired:")
print(f"\nThe dynamic pressure is {fc.q_inf.to('psi'):.5g}")

Atmosphere Package

The atmosphere package can be used to compute and interact with common standard atmosphere data and derived quantities.

Outputs include:

  • Pressure p
  • Temperature T
  • Density rho
  • Sound speed a
  • Dynamic viscosity mu
  • Kinematic viscosity nu
  • Thermal conductivity k
  • Layer name layer.name
  • Geometric altitude h
  • Geopotential altitude H
  • Acceleration due to gravity g
  • Mean free path mean_free_path

Usage:

from aeroutils.atmosphere import Atmosphere
from aeroutils.units import *

# Compute atmospheric data for a scalar or array of altitudes
h = [0.0, 12.0, 33.5] * unit('km')
atm = Atmosphere(h)
print(f"Abbreviated output: {atm}")
print(f"Extended output in Imperial units: "
    f"{atm.tostring(short_repr=False, imperial_units=False)}")

# Access individual properties and convert to desired units: "
print(f"\np={atm.p}\nT={atm.T.to('degR')}\nrho={atm.rho.to('kg/m^3')}")

# Compute properties such as thermal conductivity, mean free path and
# many more!
print(f"\nthermal conductivity k={atm.k}"
    f"\nmean free path = {atm.mean_free_path} and many more!")

License

aeroutils is licensed under the MIT LICENSE. See the LICENSE document.

Dependencies

  • numpy: package for broad scientific computing.
  • pint: package for dealing with units.
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