Functions
	_python_physics (monkeypatch)
	_evaluate (mutate=None, silent=True)
	_abl (res)
	_mach_sub (ar, g)
	_hand_bartz (res, Tw, area_ratio)
	test_barrel_convection_is_bartz_on_the_real_bore ()
	test_disabled_regen_block_does_not_reach_the_liner ()
	test_no_turbulence_multiplier ()
	test_gas_radiation_uses_a_gas_emissivity ()
	test_radiation_grows_with_bore ()
	test_leckner_anchors_hottel ()
	test_surface_runs_at_the_ablation_temperature_without_a_sink ()
	test_displayed_profile_is_bartz_along_the_contour ()
	test_regen_march_radiates_the_gas_not_a_blackbody ()

Variables
	ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
	CFG = os.path.join(ROOT, "configs", "ethalox_6500N.yaml")
float	PSI = 6894.757293168361
float	P_TANK = 584.27 * PSI
float	SIGMA = 5.670374419e-8
	CEA_MU
	CEA_CP
	CEA_PR

Detailed Description

The chamber wall's gas-side load: Bartz convection, H2O/CO2 gas radiation, the real bore.

Findings TH-3, TH-4, TH-5, TH-10 and TH-11 of the 2026-09-25 overnight review. The old model
took its bore, k, Pr, recovery factor, emissivity and turbulence from the DISABLED regen block,
radiated the gas as a blackbody at the wall's emissivity 0.85, tripled the convection with an
unsourced turbulence factor, pinned the surface at a 1200 K "limit" and then subtracted the
wall's own emission a second time toward a 600 K sink.

Expected numbers are computed here by hand: Bartz (Huzel & Huang eq. 4-13), the exact
isentropic area-Mach relation, and CEA frozen transport for LOX/ethanol at O/F 1.50, 430 psia
(rocketcea get_Chamber_Transport, frozen: cp 0.534 BTU/lbm R = 2236 J/(kg K), mu 1.041 mP,
Pr 0.664; these move < 1 % over O/F 1.45-1.55 and 400-450 psia).

Function Documentation

◆ _abl()

test_hot_gas_wall_flux._abl ( res )

protected

Definition at line 48 of file test_hot_gas_wall_flux.py.

Referenced by test_barrel_convection_is_bartz_on_the_real_bore(), test_disabled_regen_block_does_not_reach_the_liner(), test_displayed_profile_is_bartz_along_the_contour(), test_gas_radiation_uses_a_gas_emissivity(), test_no_turbulence_multiplier(), and test_surface_runs_at_the_ablation_temperature_without_a_sink().

◆ _evaluate()

test_hot_gas_wall_flux._evaluate	(		mutate = None,
			silent = True )

protected

Definition at line 41 of file test_hot_gas_wall_flux.py.

Referenced by test_barrel_convection_is_bartz_on_the_real_bore(), test_disabled_regen_block_does_not_reach_the_liner(), test_displayed_profile_is_bartz_along_the_contour(), test_gas_radiation_uses_a_gas_emissivity(), test_no_turbulence_multiplier(), test_regen_march_radiates_the_gas_not_a_blackbody(), and test_surface_runs_at_the_ablation_temperature_without_a_sink().

◆ _hand_bartz()

test_hot_gas_wall_flux._hand_bartz	(	res,
		Tw,
		area_ratio )

protected

H&H eq. 4-13 with the stagnation state of the solve; r_c the mean of the drawn contour's
1.5 Rt / 0.382 Rt throat radii.

Definition at line 57 of file test_hot_gas_wall_flux.py.

References _mach_sub().

Referenced by test_barrel_convection_is_bartz_on_the_real_bore(), and test_displayed_profile_is_bartz_along_the_contour().

◆ _mach_sub()

test_hot_gas_wall_flux._mach_sub	(		ar,
			g )

protected

Definition at line 52 of file test_hot_gas_wall_flux.py.

Referenced by _hand_bartz().

◆ _python_physics()

test_hot_gas_wall_flux._python_physics ( monkeypatch )

protected

Definition at line 36 of file test_hot_gas_wall_flux.py.

◆ test_barrel_convection_is_bartz_on_the_real_bore()

test_hot_gas_wall_flux.test_barrel_convection_is_bartz_on_the_real_bore ( )

Definition at line 76 of file test_hot_gas_wall_flux.py.

References _abl(), _evaluate(), and _hand_bartz().

◆ test_disabled_regen_block_does_not_reach_the_liner()

test_hot_gas_wall_flux.test_disabled_regen_block_does_not_reach_the_liner ( )

Definition at line 88 of file test_hot_gas_wall_flux.py.

References _abl(), and _evaluate().

◆ test_displayed_profile_is_bartz_along_the_contour()

test_hot_gas_wall_flux.test_displayed_profile_is_bartz_along_the_contour ( )

Definition at line 175 of file test_hot_gas_wall_flux.py.

References _abl(), _evaluate(), _hand_bartz(), max, and min.

◆ test_gas_radiation_uses_a_gas_emissivity()

test_hot_gas_wall_flux.test_gas_radiation_uses_a_gas_emissivity ( )

H2O 45 % / CO2 14 % at ~29 bar over an 8-12 cm beam: Leckner eps_g 0.15-0.30, i.e.
0.8-2 MW/m^2 onto a 1200 K wall -- not 0.85 sigma Tc^4 = 5.1 MW/m^2.

Definition at line 116 of file test_hot_gas_wall_flux.py.

References _abl(), and _evaluate().

◆ test_leckner_anchors_hottel()

test_hot_gas_wall_flux.test_leckner_anchors_hottel ( )

Zero-pressure H2O emissivity at 1000 K and 1 bar cm is 0.034 (Hottel/Leckner).

Definition at line 147 of file test_hot_gas_wall_flux.py.

◆ test_no_turbulence_multiplier()

test_hot_gas_wall_flux.test_no_turbulence_multiplier ( )

Definition at line 107 of file test_hot_gas_wall_flux.py.

References _abl(), and _evaluate().

◆ test_radiation_grows_with_bore()

test_hot_gas_wall_flux.test_radiation_grows_with_bore ( )

Definition at line 133 of file test_hot_gas_wall_flux.py.

◆ test_regen_march_radiates_the_gas_not_a_blackbody()

test_hot_gas_wall_flux.test_regen_march_radiates_the_gas_not_a_blackbody ( )

With regen on, radiation_emissivity_hot is the WALL's emissivity: the gas term is Leckner's,
1-2 MW/m^2 here, not 0.85 sigma Tc^4 (~5-6 MW/m^2).

Definition at line 195 of file test_hot_gas_wall_flux.py.

References _evaluate().

◆ test_surface_runs_at_the_ablation_temperature_without_a_sink()

test_hot_gas_wall_flux.test_surface_runs_at_the_ablation_temperature_without_a_sink ( )

The hot face sits at the material's ablation temperature (a config property), and the
net flux is exactly blown convection plus gas radiation: no second wall-emission term.

Definition at line 153 of file test_hot_gas_wall_flux.py.

References _abl(), and _evaluate().

Variable Documentation

◆ CEA_CP

test_hot_gas_wall_flux.CEA_CP

Definition at line 32 of file test_hot_gas_wall_flux.py.

◆ CEA_MU

test_hot_gas_wall_flux.CEA_MU

Definition at line 32 of file test_hot_gas_wall_flux.py.

◆ CEA_PR

test_hot_gas_wall_flux.CEA_PR

Definition at line 32 of file test_hot_gas_wall_flux.py.

◆ CFG

test_hot_gas_wall_flux.CFG = os.path.join(ROOT, "configs", "ethalox_6500N.yaml")

Definition at line 28 of file test_hot_gas_wall_flux.py.

◆ P_TANK

float test_hot_gas_wall_flux.P_TANK = 584.27 * PSI

Definition at line 30 of file test_hot_gas_wall_flux.py.

◆ PSI

float test_hot_gas_wall_flux.PSI = 6894.757293168361

Definition at line 29 of file test_hot_gas_wall_flux.py.

◆ ROOT

test_hot_gas_wall_flux.ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))

Definition at line 27 of file test_hot_gas_wall_flux.py.

◆ SIGMA

float test_hot_gas_wall_flux.SIGMA = 5.670374419e-8

Definition at line 31 of file test_hot_gas_wall_flux.py.

Functions

Variables

Detailed Description

Function Documentation

◆ _abl()

◆ _evaluate()

◆ _hand_bartz()

◆ _mach_sub()

◆ _python_physics()

◆ test_barrel_convection_is_bartz_on_the_real_bore()

◆ test_disabled_regen_block_does_not_reach_the_liner()

◆ test_displayed_profile_is_bartz_along_the_contour()

◆ test_gas_radiation_uses_a_gas_emissivity()

◆ test_leckner_anchors_hottel()

◆ test_no_turbulence_multiplier()

◆ test_radiation_grows_with_bore()

◆ test_regen_march_radiates_the_gas_not_a_blackbody()

◆ test_surface_runs_at_the_ablation_temperature_without_a_sink()

Variable Documentation

◆ CEA_CP

◆ CEA_MU

◆ CEA_PR

◆ CFG

◆ P_TANK

◆ PSI

◆ ROOT

◆ SIGMA