Ejector (thermocompressor) simulation

motive (HP) + suction (LP) -> discharge (recompressed)

Governing equations

The exact equations the solver works for a ejector (thermocompressor) — the same math shown in the app's "Theory" panel, not a black box.

$u_p$

motive-nozzle exit velocity [m/s] (supersonic steam jet)

$\eta_n, \eta_{mix}, \eta_d$

nozzle / mixing / diffuser efficiencies

$c_p$

isobaric heat capacity [J/mol/K]

$M_m$

motive molar mass [kg/mol]

$T_m, T_0$

motive inlet and mixed stagnation temperatures [K]

$P_m, P_s, P_d$

motive / suction / discharge pressures [Pa]

$\gamma, k$

isentropic exponent and (γ−1)/γ

$u_{mix}$

mixed velocity [m/s]

$\omega$

mass entrainment ratio = suction / motive mass flow

$\omega_{max}$

the maximum entrainment the ejector can compress to P_d

Parameters

discharge_pressure [Pa, required — between the suction and motive pressures]; nozzle_efficiency [default 0.9], mixing_efficiency [default 0.85], diffuser_efficiency [default 0.85]. Two inlets: motive (higher pressure) + suction (lower pressure); one recompressed discharge outlet. Reports the entrainment ratio vs the achievable maximum.

Example flowsheets that use it