对齐Amesim氦气PR物性与PNVO流量

app/simulation/core/medium.py

@@ -38,16 +38,29 @@ class GasMedium(Protocol):
 
     def density(self, p: float, T: float) -> float: ...
 
+    def isentropic_density_pressure_factor(
+        self,
+        p: float,
+        T: float,
+        downstream_pressure: float | None = None,
+    ) -> float: ...
+
     def dynamic_viscosity(self, T: float) -> float: ...
 
     def specific_internal_energy(self, T: float) -> float: ...
 
+    def specific_internal_energy_at_pressure(self, p: float, T: float) -> float: ...
+
     def specific_enthalpy(self, T: float) -> float: ...
 
+    def specific_enthalpy_at_pressure(self, p: float, T: float) -> float: ...
+
     def temperature_from_internal_energy(self, u: float) -> float: ...
 
     def temperature_from_enthalpy(self, h: float) -> float: ...
 
+    def temperature_from_pressure_enthalpy(self, p: float, h: float) -> float: ...
+
     def temperature_from_mass_internal_energy(self, m: float, U: float) -> float: ...
 
     def pressure(self, m: float, T: float, V: float) -> float: ...
@@ -96,6 +109,18 @@ class IdealGasMedium:
     def density(self, p: float, T: float) -> float:
         return p / (self.R_gas * T)
 
+    def isentropic_density_pressure_factor(
+        self,
+        p: float,
+        T: float,
+        downstream_pressure: float | None = None,
+    ) -> float:
+        del p
+        del downstream_pressure
+        cp = self.cp_at_temperature(T)
+        cv = self.cv_at_temperature(T)
+        return cv / cp
+
     def dynamic_viscosity(self, T: float) -> float:
         """Return dynamic viscosity using the default air Sutherland law."""
 
@@ -116,6 +141,10 @@ class IdealGasMedium:
             + 0.5 * self.cp_slope * delta_T * delta_T
         )
 
+    def specific_internal_energy_at_pressure(self, p: float, T: float) -> float:
+        del p
+        return self.specific_internal_energy(T)
+
     def specific_enthalpy(self, T: float) -> float:
         delta_T = T - self.T_ref
         return (
@@ -124,6 +153,10 @@ class IdealGasMedium:
             + 0.5 * self.cp_slope * delta_T * delta_T
         )
 
+    def specific_enthalpy_at_pressure(self, p: float, T: float) -> float:
+        del p
+        return self.specific_enthalpy(T)
+
     def temperature_from_internal_energy(self, u: float) -> float:
         reference_internal_energy = self.cv * self.T_ref
         delta_u = u - reference_internal_energy
@@ -156,6 +189,10 @@ class IdealGasMedium:
         delta_T = positive_root if abs(positive_root) <= abs(negative_root) else negative_root
         return self.T_ref + delta_T
 
+    def temperature_from_pressure_enthalpy(self, p: float, h: float) -> float:
+        del p
+        return self.temperature_from_enthalpy(h)
+
     def temperature_from_mass_internal_energy(self, m: float, U: float) -> float:
         if m <= 0.0:
             raise ValueError("Mass must stay positive when recovering temperature.")