修正动态管与阀门诊断输出

app/simulation/components/amesim/flow/orifices.py

@@ -35,6 +35,7 @@ _FLOWSET_USES_CV = (ParameterCondition("flowset", (2.0,)),)
 _FLOWSET_USES_KV = (ParameterCondition("flowset", (3.0,)),)
 _PN_PRESSURE_RATIO_ACCURACY = 0.9999
 _PN_LAMINAR_SMOOTHING_GAIN = 12.0
+_PNVO001_CLOSED_OPENING_ABS_TOL = 1.0e-12
 _PNOR001_FLOW_COEFFICIENT_GROUP = ParameterGroupDisplaySpec(
     id="flow_coefficient",
     label="流量系数",
@@ -835,6 +836,16 @@ class AmesimPnvo001FixedOpening(AlgebraicComponent):
             downstream_pressure=downstream_pressure,
             upstream_temperature=upstream_temperature,
         )
+        # AMESim reports no vena-contracta velocity while the valve is closed.
+        # Signal propagation around a step can leave a round-off-sized opening,
+        # so apply the same numerical-zero convention to this diagnostic only.
+        if isclose(
+            self.opening,
+            0.0,
+            rel_tol=0.0,
+            abs_tol=_PNVO001_CLOSED_OPENING_ABS_TOL,
+        ):
+            gas_velocity = 0.0
         return {
             "xv": self.opening,
             "cm": mass_flow_parameter,

app/simulation/components/amesim/flow/pipes.py

@@ -75,6 +75,31 @@ def _reported_friction_factor(value: float) -> float:
     return min(float(value), _MAX_REPORTED_FRICTION_FACTOR)
 
 
+def _bare_pipe_mass_flow_parameter(
+    mass_flow: float,
+    *,
+    area: float,
+    diameter: float,
+    upstream_pressure: float,
+    upstream_temperature: float,
+    resistance_length: float,
+    friction_factor: float,
+) -> float:
+    """Return Amesim's ``Cm`` without the pipe flow coefficient ``Cq``."""
+
+    flow_coefficient = sqrt(
+        diameter / (resistance_length * friction_factor)
+    )
+    return (
+        abs(mass_flow)
+        * sqrt(upstream_temperature)
+        / max(
+            flow_coefficient * area * upstream_pressure,
+            1.0e-18,
+        )
+    )
+
+
 _DYNAMIC_PIPE_POLYTROPIC_MODE = ParameterCondition("mode", (1.0,))
 _DYNAMIC_PIPE_HEAT_EXCHANGE_MODE = ParameterCondition("mode", (2.0,))
 _DYNAMIC_PIPE_PARAMETER_GROUPS = (
@@ -1014,6 +1039,7 @@ class AmesimPnl0001(ThermodynamicVolumeComponent):
         upstream_pressure = max(self.port_1.p, props.p, 1.0)
         density = max(self.medium.density(upstream_pressure, props.T), 1.0e-12)
         reynolds = self.reynolds_number(flow, props.T)
+        friction = self.friction_factor(reynolds)
         return {
             "m": self.state.m,
             "U": self.state.U,
@@ -1023,13 +1049,17 @@ class AmesimPnl0001(ThermodynamicVolumeComponent):
             "u": props.u,
             "h": props.h,
             "re": reynolds,
-            "cm": (
+            "cm": _bare_pipe_mass_flow_parameter(
-                abs(flow)
+                flow,
-                * sqrt(props.T)
+                area=self.area,
-                / max(self.area * upstream_pressure, 1.0e-18)
+                diameter=self.diam,
+                upstream_pressure=upstream_pressure,
+                upstream_temperature=props.T,
+                resistance_length=self.le,
+                friction_factor=friction,
             ),
             "v": flow / (density * self.area),
-            "ff": _reported_friction_factor(self.friction_factor(reynolds)),
+            "ff": _reported_friction_factor(friction),
         }
 
     def pressure_flow_equation_values(self) -> tuple[float, ...]:
@@ -1344,16 +1374,21 @@ class AmesimPnl0002(AmesimPnl0001):
                 1.0e-12,
             )
             reynolds = self.reynolds_number(flow, upstream_temperature)
+            friction = self.friction_factor(reynolds)
             resistance_diagnostics.append(
                 (
                     reynolds,
-                    (
+                    _bare_pipe_mass_flow_parameter(
-                        abs(flow)
+                        flow,
-                        * sqrt(upstream_temperature)
+                        area=self.area,
-                        / max(self.area * upstream_pressure, 1.0e-18)
+                        diameter=self.diam,
+                        upstream_pressure=upstream_pressure,
+                        upstream_temperature=upstream_temperature,
+                        resistance_length=self.resistance_length,
+                        friction_factor=friction,
                     ),
                     abs(flow) / (density * self.area),
-                    self.friction_factor(reynolds),
+                    friction,
                 )
             )
         reynolds, cm, velocity, friction = (
@@ -1699,6 +1734,7 @@ class AmesimPnl0003(DynamicComponent):
         center_flow = self.resistance_mass_flow()
         upstream = port_1 if center_flow >= 0.0 else port_2
         reynolds = self.reynolds_number(center_flow, upstream.T)
+        friction = self.friction_factor(reynolds)
         return {
             "m1": self.state_1.m,
             "U1": self.state_1.U,
@@ -1716,13 +1752,17 @@ class AmesimPnl0003(DynamicComponent):
             "h2": port_2.h,
             "dmctr": center_flow,
             "re": reynolds,
-            "cm": (
+            "cm": _bare_pipe_mass_flow_parameter(
-                abs(center_flow)
+                center_flow,
-                * sqrt(upstream.T)
+                area=self.area,
-                / max(self.area * max(port_1.p, port_2.p, 1.0), 1.0e-18)
+                diameter=self.diam,
+                upstream_pressure=max(port_1.p, port_2.p, 1.0),
+                upstream_temperature=upstream.T,
+                resistance_length=self.le,
+                friction_factor=friction,
             ),
             "v": center_flow / (max(upstream.rho, 1.0e-12) * self.area),
-            "ff": _reported_friction_factor(self.friction_factor(reynolds)),
+            "ff": _reported_friction_factor(friction),
         }
 
     def pressure_flow_equation_values(self) -> tuple[float, ...]:

tests/test_amesim_pnl0001_component.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import unittest
+from math import sqrt
 
 from app.simulation.components.amesim.flow.pipes import AmesimPnl0001
 from app.simulation.core.medium import IdealGasMedium
@@ -148,6 +149,33 @@ class AmesimPnl0001ComponentTests(unittest.TestCase):
             {"m", "U", "p", "T", "rho", "u", "h", "re", "cm", "v", "ff"},
         )
 
+    def test_result_cm_excludes_pipe_flow_coefficient(self) -> None:
+        pipe = AmesimPnl0001(
+            "pnl_1",
+            self.medium,
+            diam=0.014,
+            le=0.3,
+            rr=0.045 / 14.0,
+            p0=2.5e6,
+            T0=290.0,
+        )
+        pipe.port_1.p = 1.6e6
+        props = pipe.properties()
+        flow = pipe.mass_flow(pipe.port_1.p, props.p, props.T)
+        reynolds = pipe.reynolds_number(flow, props.T)
+        friction = pipe.friction_factor(reynolds)
+        raw_cq_cm = (
+            abs(flow)
+            * sqrt(props.T)
+            / (pipe.area * max(pipe.port_1.p, props.p))
+        )
+        flow_coefficient = sqrt(pipe.diam / (pipe.le * friction))
+
+        actual = pipe.component_result_values()["cm"]
+
+        self.assertAlmostEqual(actual, raw_cq_cm / flow_coefficient)
+        self.assertNotAlmostEqual(actual, raw_cq_cm)
+
 
 if __name__ == "__main__":
     unittest.main()

tests/test_amesim_pnl0002_pnl0003_component.py

@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 import unittest
-from math import log10
+from math import log10, sqrt
 
 from app.simulation.components.amesim.flow.pipes import AmesimPnl0002, AmesimPnl0003
 from app.simulation.core.medium import IdealGasMedium
@@ -200,6 +200,79 @@ class AmesimPnl0002ComponentTests(unittest.TestCase):
         self.assertAlmostEqual(derivative[0], 0.3)
         self.assertAlmostEqual(derivative[1], 0.3 * props.h)
 
+    def test_result_cm_averages_bare_parameter_for_each_resistance(self) -> None:
+        pipe = AmesimPnl0002(
+            "pnl_2",
+            self.medium,
+            diam=0.02,
+            le=2.0,
+            rr=0.045 / 20.0,
+            p0=100000.0,
+            T0=350.0,
+        )
+        center = pipe.properties()
+        pipe.port_1.p = 130000.0
+        pipe.port_2.p = 80000.0
+        pipe.update_flow_temperature_references(
+            {
+                "port_1": self.medium.specific_enthalpy_at_pressure(
+                    pipe.port_1.p,
+                    250.0,
+                ),
+                "port_2": self.medium.specific_enthalpy_at_pressure(
+                    pipe.port_2.p,
+                    450.0,
+                ),
+            }
+        )
+
+        raw_parameters: list[float] = []
+        bare_parameters: list[float] = []
+        frictions: list[float] = []
+        for port_name, port in (
+            ("port_1", pipe.port_1),
+            ("port_2", pipe.port_2),
+        ):
+            flow = pipe.port_mass_flow(
+                port.p,
+                center.p,
+                center.T,
+                port_name=port_name,
+            )
+            if flow >= 0.0:
+                upstream_pressure = port.p
+                upstream_temperature = pipe.medium.temperature_from_pressure_enthalpy(
+                    port.p,
+                    pipe._connected_h[port_name],
+                )
+            else:
+                upstream_pressure = center.p
+                upstream_temperature = center.T
+            reynolds = pipe.reynolds_number(flow, upstream_temperature)
+            friction = pipe.friction_factor(reynolds)
+            raw = (
+                abs(flow)
+                * sqrt(upstream_temperature)
+                / (pipe.area * upstream_pressure)
+            )
+            flow_coefficient = sqrt(
+                pipe.diam / (pipe.resistance_length * friction)
+            )
+            raw_parameters.append(raw)
+            bare_parameters.append(raw / flow_coefficient)
+            frictions.append(friction)
+
+        expected = sum(bare_parameters) / 2.0
+        collapsed = (sum(raw_parameters) / 2.0) / sqrt(
+            pipe.diam
+            / (pipe.resistance_length * (sum(frictions) / 2.0))
+        )
+
+        actual = pipe.component_result_values()["cm"]
+
+        self.assertAlmostEqual(actual, expected)
+        self.assertGreater(abs(actual - collapsed), 1.0e-8)
+
 
 class AmesimPnl0003ComponentTests(unittest.TestCase):
     def setUp(self) -> None:
@@ -389,6 +462,36 @@ class AmesimPnl0003ComponentTests(unittest.TestCase):
         self.assertIn("dmctr", values)
         self.assertIn("re", values)
 
+    def test_result_cm_excludes_center_resistance_flow_coefficient(self) -> None:
+        pipe = AmesimPnl0003(
+            "pnl_3",
+            self.medium,
+            diam=0.02,
+            le=0.3,
+            rr=0.045 / 20.0,
+            p1_0=10.7e6,
+            T1_0=263.4,
+            p2_0=10.68e6,
+            T2_0=263.42,
+        )
+        port_1 = pipe.properties_1()
+        port_2 = pipe.properties_2()
+        flow = pipe.resistance_mass_flow()
+        upstream = port_1 if flow >= 0.0 else port_2
+        reynolds = pipe.reynolds_number(flow, upstream.T)
+        friction = pipe.friction_factor(reynolds)
+        raw_cq_cm = (
+            abs(flow)
+            * sqrt(upstream.T)
+            / (pipe.area * max(port_1.p, port_2.p))
+        )
+        flow_coefficient = sqrt(pipe.diam / (pipe.le * friction))
+
+        actual = pipe.component_result_values()["cm"]
+
+        self.assertAlmostEqual(actual, raw_cq_cm / flow_coefficient)
+        self.assertNotAlmostEqual(actual, raw_cq_cm)
+
 
 if __name__ == "__main__":
     unittest.main()

tests/test_amesim_pnvo001_fixed_component.py

@@ -54,6 +54,25 @@ class AmesimPnvo001FixedOpeningComponentTests(unittest.TestCase):
 
         self.assertEqual(valve.mass_flow(500000.0, 100000.0), 0.0)
 
+    def test_closed_opening_only_zeroes_reported_gas_velocity(self) -> None:
+        valve = AmesimPnvo001FixedOpening("valve_1", self.medium, opening=0.0)
+        valve.port_2.p = 500000.0
+        valve.port_3.p = 100000.0
+
+        closed = valve.component_result_values()
+        self.assertGreater(closed["cm"], 0.0)
+        self.assertEqual(closed["gasvel"], 0.0)
+
+        valve.opening = 7.0e-15
+        roundoff_closed = valve.component_result_values()
+        self.assertEqual(roundoff_closed["gasvel"], 0.0)
+        self.assertEqual(roundoff_closed["cm"], closed["cm"])
+
+        valve.opening = 1.0e-9
+        genuinely_open = valve.component_result_values()
+        self.assertNotEqual(genuinely_open["gasvel"], 0.0)
+        self.assertEqual(genuinely_open["cm"], closed["cm"])
+
     def test_mass_flow_is_bidirectional_by_pressure_order(self) -> None:
         valve = AmesimPnvo001FixedOpening("valve_1", self.medium, opening=0.5)
 

tests/test_amesim_pnvo001_signal_xml.py

@@ -244,6 +244,8 @@ class AmesimPnvo001SignalXmlTests(unittest.TestCase):
         self.assertEqual(result["series"]["step_1.out.signal"][at_event], 1.0)
         self.assertEqual(result["series"]["valve_1.xv"][before_event], 0.0)
         self.assertEqual(result["series"]["valve_1.xv"][at_event], 1.0)
+        self.assertEqual(result["series"]["valve_1.gasvel"][before_event], 0.0)
+        self.assertNotEqual(result["series"]["valve_1.gasvel"][at_event], 0.0)
         self.assertGreater(
             result["series"]["valve_1.port_2.m_flow"][at_event],
             0.45,