优化端口传递物性参数方式，减少上下游元件重复计算量

native/include/kernels.h

@@ -1,5 +1,6 @@
 #ifndef NATIVE_KERNELS_H
 #define NATIVE_KERNELS_H
+#include <stddef.h>
 typedef struct { double p, T, rho, u, h; } NativeGas;
 typedef struct {
     int velocity_index;
@@ -8,6 +9,30 @@ typedef struct {
 } NativeStop;
 /* Constants are emitted per medium instance by the model compiler. */
 typedef struct { int real_helium; double R, cp, Tref, slope, mu, muT, S; } NativeMedium;
+/* Caller-owned scratch for ONE model_eval. Keys use exact values and a copy of
+ * every medium constant. No process/thread global cache or approximate reuse. */
+enum {
+    NATIVE_PROPERTY_PT=1, NATIVE_PROPERTY_H=2, NATIVE_PROPERTY_RHO=4,
+    NATIVE_PROPERTY_MU=8, NATIVE_PROPERTY_ISENTROPIC=16
+};
+typedef struct {
+    NativeMedium medium;
+    double p, T, h, rho, mu, isentropic_factor, isentropic_exponent;
+    unsigned valid;
+} NativePropertyState;
+typedef struct {
+    NativePropertyState *states;
+    size_t count, capacity;
+} NativePropertyCache;
+void native_properties_init(NativePropertyCache *, NativePropertyState *, size_t capacity);
+int native_gas_context(NativePropertyCache *, double m, double U, double V, NativeGas *);
+int native_medium_gas_context(NativePropertyCache *, const NativeMedium *, double m, double U, double V, NativeGas *);
+double native_temperature_ph_context(NativePropertyCache *, const NativeMedium *, double p, double h);
+double native_density_context(NativePropertyCache *, const NativeMedium *, double p, double T);
+int native_orifice_context(NativePropertyCache *, double p1, double p2, double h1, double h2,
+                           double area, double opening, double *q, double *cm, double *v);
+int native_medium_orifice_context(NativePropertyCache *, const NativeMedium *, double p1, double p2, double h1, double h2,
+                                  double area, double opening, double *q, double *cm, double *v);
 /* One entry per pipe branch, zero-initialized for each model_eval. Never shared
  * across solver trials. Exact inputs, including medium constants, form the key. */
 typedef struct {
@@ -15,6 +40,16 @@ typedef struct {
     double p1, p2, T, diameter, length, roughness, flow;
     int kind, valid;
 } NativePipeCache;
+typedef struct { int converged, iterations, bisections; double relative_residual; } NativePipeSolve;
+/* Solve Re^2*f(Re)=K for the shared pipe resistance law. On failure returns
+ * NAN, with converged=0; flow_per_re converts the local stopping test to kg/s. */
+double native_pipe_resistance(double K, double roughness, double flow_per_re, NativePipeSolve *status);
+double native_pipe_flow_context(NativePropertyCache *, const NativeMedium *, double p1, double p2, double T,
+                                double diameter, double length, double roughness, int kind);
+double native_pipe_flow_cached_context(NativePropertyCache *, NativePipeCache *, const NativeMedium *,
+                                       double p1, double p2, double T, double diameter, double length, double roughness, int kind);
+void native_pipe_diagnostics_context(NativePropertyCache *, const NativeMedium *, double q, double p, double T,
+                                     double diameter, double length, double roughness, int diagnostic, double *result);
 int native_medium_init(const NativeMedium *, double p, double T, double V, int legacy_ideal_initial, double *mU);
 double native_density(const NativeMedium *, double p, double T);
 double native_temperature_ph(const NativeMedium *, double p, double h);