Module nozzle 

Nozzle exit-state kernels: the branch-selected inverse of the area–Mach relation and the isentropic exit-state composition. Both build on the existing Mach-parameterized isentropic kernels in kernels/fluids/ — no isentropic formula is restated here.

Functions

inverse_area_mach_kernel

Mach number from the area ratio — the branch-selected inverse of the area–Mach relation

nozzle_exit_state_kernel

Isentropically expanded nozzle exit state from chamber conditions — the unstated input that makes the SRP momentum-flux ratio computable from a commanded throttle: exit Mach from the inverse area–Mach relation, static exit pressure/temperature from the existing isentropic-ratio kernels, exit density from the ideal-gas state relation ρ = p/(R_s·T) (this crate’s single authoritative use), and exit velocity u_e = M_e · a(T_e) through the existing speed-of-sound kernel.