新增test_mql气动组件原语

tests/test_amesim_pneumatic_components.py

@@ -0,0 +1,92 @@
+from __future__ import annotations
+
+import unittest
+
+from PythonModels.components.amesim_pneumatic import (
+    HELIUM_PNEUMATIC_GAS,
+    AmesimPneumaticOrifice,
+    AmesimPneumaticVolume,
+    compressible_orifice_mass_flow,
+    diameter_mm_to_area_m2,
+    liters_to_m3,
+    mm2_to_m2,
+)
+
+
+class AmesimPneumaticComponentsTest(unittest.TestCase):
+    def test_unit_conversions(self) -> None:
+        self.assertAlmostEqual(liters_to_m3(15.0), 0.015)
+        self.assertAlmostEqual(mm2_to_m2(78.5), 78.5e-6)
+        self.assertAlmostEqual(diameter_mm_to_area_m2(10.0), 7.853981633974483e-5)
+
+    def test_volume_initial_state_matches_requested_pressure_temperature(self) -> None:
+        volume = AmesimPneumaticVolume.from_liters(
+            name="pn_general_chamber",
+            volume_liters=57.0,
+            p0=15.3e6,
+            T0=293.15,
+        )
+        props = volume.properties()
+
+        self.assertAlmostEqual(props.p, 15.3e6, delta=15.3e6 * 1.0e-12)
+        self.assertAlmostEqual(props.T, 293.15)
+        self.assertGreater(props.rho, 20.0)
+        self.assertLess(props.rho, 30.0)
+
+    def test_orifice_returns_signed_mass_flow(self) -> None:
+        orifice = AmesimPneumaticOrifice.from_mm2(
+            name="pn_orifice_18",
+            area_mm2=78.5,
+            flow_coefficient=0.9,
+        )
+
+        forward = orifice.mass_flow(15.3e6, 1.0e6, 293.15)
+        reverse = orifice.mass_flow(1.0e6, 15.3e6, 293.15)
+
+        self.assertGreater(forward, 0.0)
+        self.assertAlmostEqual(reverse, -forward)
+        self.assertEqual(orifice.mass_flow(1.0e6, 1.0e6, 293.15), 0.0)
+
+    def test_choked_flow_is_independent_of_lower_downstream_pressure(self) -> None:
+        base = compressible_orifice_mass_flow(
+            upstream_pressure=15.3e6,
+            downstream_pressure=1.0e6,
+            upstream_temperature=293.15,
+            area=78.5e-6,
+            flow_coefficient=0.9,
+            gas=HELIUM_PNEUMATIC_GAS,
+        )
+        lower_back_pressure = compressible_orifice_mass_flow(
+            upstream_pressure=15.3e6,
+            downstream_pressure=0.1e6,
+            upstream_temperature=293.15,
+            area=78.5e-6,
+            flow_coefficient=0.9,
+            gas=HELIUM_PNEUMATIC_GAS,
+        )
+
+        self.assertGreater(base, 0.0)
+        self.assertAlmostEqual(lower_back_pressure, base)
+
+    def test_subcritical_flow_decreases_as_back_pressure_rises(self) -> None:
+        low_back_pressure = compressible_orifice_mass_flow(
+            upstream_pressure=1.0e6,
+            downstream_pressure=0.6e6,
+            upstream_temperature=293.15,
+            area=78.5e-6,
+            flow_coefficient=0.9,
+        )
+        high_back_pressure = compressible_orifice_mass_flow(
+            upstream_pressure=1.0e6,
+            downstream_pressure=0.9e6,
+            upstream_temperature=293.15,
+            area=78.5e-6,
+            flow_coefficient=0.9,
+        )
+
+        self.assertGreater(low_back_pressure, high_back_pressure)
+        self.assertGreater(high_back_pressure, 0.0)
+
+
+if __name__ == "__main__":
+    unittest.main()