93 lines
3.0 KiB
Python
93 lines
3.0 KiB
Python
from __future__ import annotations
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import unittest
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from PythonModels.components.amesim_pneumatic import (
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HELIUM_PNEUMATIC_GAS,
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AmesimPneumaticOrifice,
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AmesimPneumaticVolume,
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compressible_orifice_mass_flow,
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diameter_mm_to_area_m2,
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liters_to_m3,
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mm2_to_m2,
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)
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class AmesimPneumaticComponentsTest(unittest.TestCase):
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def test_unit_conversions(self) -> None:
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self.assertAlmostEqual(liters_to_m3(15.0), 0.015)
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self.assertAlmostEqual(mm2_to_m2(78.5), 78.5e-6)
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self.assertAlmostEqual(diameter_mm_to_area_m2(10.0), 7.853981633974483e-5)
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def test_volume_initial_state_matches_requested_pressure_temperature(self) -> None:
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volume = AmesimPneumaticVolume.from_liters(
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name="pn_general_chamber",
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volume_liters=57.0,
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p0=15.3e6,
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T0=293.15,
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)
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props = volume.properties()
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self.assertAlmostEqual(props.p, 15.3e6, delta=15.3e6 * 1.0e-12)
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self.assertAlmostEqual(props.T, 293.15)
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self.assertGreater(props.rho, 20.0)
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self.assertLess(props.rho, 30.0)
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def test_orifice_returns_signed_mass_flow(self) -> None:
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orifice = AmesimPneumaticOrifice.from_mm2(
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name="pn_orifice_18",
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area_mm2=78.5,
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flow_coefficient=0.9,
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)
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forward = orifice.mass_flow(15.3e6, 1.0e6, 293.15)
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reverse = orifice.mass_flow(1.0e6, 15.3e6, 293.15)
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self.assertGreater(forward, 0.0)
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self.assertAlmostEqual(reverse, -forward)
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self.assertEqual(orifice.mass_flow(1.0e6, 1.0e6, 293.15), 0.0)
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def test_choked_flow_is_independent_of_lower_downstream_pressure(self) -> None:
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base = compressible_orifice_mass_flow(
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upstream_pressure=15.3e6,
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downstream_pressure=1.0e6,
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upstream_temperature=293.15,
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area=78.5e-6,
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flow_coefficient=0.9,
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gas=HELIUM_PNEUMATIC_GAS,
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)
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lower_back_pressure = compressible_orifice_mass_flow(
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upstream_pressure=15.3e6,
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downstream_pressure=0.1e6,
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upstream_temperature=293.15,
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area=78.5e-6,
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flow_coefficient=0.9,
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gas=HELIUM_PNEUMATIC_GAS,
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)
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self.assertGreater(base, 0.0)
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self.assertAlmostEqual(lower_back_pressure, base)
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def test_subcritical_flow_decreases_as_back_pressure_rises(self) -> None:
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low_back_pressure = compressible_orifice_mass_flow(
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upstream_pressure=1.0e6,
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downstream_pressure=0.6e6,
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upstream_temperature=293.15,
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area=78.5e-6,
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flow_coefficient=0.9,
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)
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high_back_pressure = compressible_orifice_mass_flow(
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upstream_pressure=1.0e6,
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downstream_pressure=0.9e6,
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upstream_temperature=293.15,
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area=78.5e-6,
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flow_coefficient=0.9,
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)
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self.assertGreater(low_back_pressure, high_back_pressure)
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self.assertGreater(high_back_pressure, 0.0)
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if __name__ == "__main__":
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unittest.main()
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