LRE Coaxial Swirl Injector Chamber & De Laval Nozzle Mass Balance

Rocket Propulsion Hydrodynamics (CFD)PASS · 0.62%

Three-inlet mass conservation and converging-diverging De Laval nozzle throat acceleration in a liquid rocket engine chamber with axial oxidizer feed, dual tangential fuel swirl injectors, and a 4-strut flameholder.

Tolerance:: 5%

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Problem statement

Geometry: Rocket chamber Ø100 mm with axial oxidizer inlet Ø48 mm (X = -90 mm), two tangential fuel inlets Ø28 mm (X = -5 mm, Y = ±35 mm), 4-strut conical flameholder bluff body, and De Laval nozzle throat Ø40 mm expanding to Ø76 mm exit (X = 320 mm).
Material: RP-1 Kerosene at 20 °C (rho = 800.0 kg/m³, mu = 1.60e-3 Pa·s).
Boundary conditions: Axial inlet U_ox = 8.0 m/s, two tangential fuel inlets U_fuel = 12.0 m/s, nozzle exit gauge pressure 0 Pa, viscous no-slip wall on flameholder struts and chamber contour.
Measured quantity: Conservation of mass m_out = m_in = 12.042 kg/s (computed 11.968 kg/s, deviation 0.62%) and throat jet velocity |U|_max = 29.31 m/s.

WebCAE Terminal

Paste these commands into the Terminal panel inside WebCAE. They use the same text DSL as the application; run one command per line:

units mm
import path="cfd_lre_injector_chamber.step" format=step
mesh tet size=10
cfd fluid kerosene
cfd set mode=steady speed=8.0 turbulence=sst iterations=600 tol=1e-8 threads=8 intensity=5 multigrid=1 cfl=9.0
cfd inlet surface number 28 speed=8.0 intensity=0.05
cfd inlet surface number 2 speed=12.0 intensity=0.05
cfd inlet surface number 27 speed=12.0 intensity=0.05
cfd outlet surface number 34 pressure=0
cfd wall surface number 6 monitor=on
cfd wall surface number 7 monitor=on
cfd wall surface number 8 monitor=on
cfd wall surface number 9 monitor=on
cfd wall surface number 10 monitor=on
cfd wall surface number 11 monitor=on
cfd wall surface number 12 monitor=on
cfd wall surface number 13 monitor=on
cfd wall surface number 14 monitor=on
cfd wall surface number 15 monitor=on
cfd wall surface number 16 monitor=on
cfd wall surface number 17 monitor=on
cfd wall surface number 18 monitor=on
cfd wall surface number 19 monitor=on
cfd wall surface number 20 monitor=on
cfd wall surface number 21 monitor=on
cfd wall surface number 25 monitor=on
cfd wall surface number 26 monitor=on
cfd wall surface number 30 monitor=on
cfd wall surface number 1 monitor=off
cfd wall surface number 3 monitor=off
cfd wall surface number 4 monitor=off
cfd wall surface number 5 monitor=off
cfd wall surface number 22 monitor=off
cfd wall surface number 23 monitor=off
cfd wall surface number 24 monitor=off
cfd wall surface number 29 monitor=off
cfd wall surface number 31 monitor=off
cfd wall surface number 32 monitor=off
cfd wall surface number 33 monitor=off
solve cfd

Results comparison

Reference value	12.042 kg/s
Our result	11.968 kg/s
Deviation	0.62%
Tolerance	5%
Status	PASS · 0.62%
Element family	Finite-volume CFD
Mesh details	2297 узлов, 8672 тет (Netgen P1 tet mesh, камера ЖРД с 2 тангенциальными вводами и соплом Лаваля)

Updated: 2026-10-19 · WebCAE 0.2.0 · 54751b2e+dirty