Functions
Dict[str, Any]	_strip_none_fp (Dict[str, Any] fp)
None	_apply_throat_mm2 (Any cfg, float mm2)
Tuple[Any,...]	_hist_signature (Dict[str, Any] h)
None	_apply_hist_to_cfg (Any cfg, Dict[str, Any] h)
Optional[float]	_inj_diag (Dict[str, Any] res, str key)
Dict[str, Any]	_evaluate_feed_row (Path cfg_template, Dict[str, Any] h, *, float P_tank_O_psi, float P_tank_F_psi, float dp_inj_pc_lo, float dp_inj_pc_hi)
None	main ()

Variables
	ROOT = Path(__file__).resolve().parents[1]
float	PSI_TO_PA = 6894.76
float	PA_TO_PSI = 1.0 / PSI_TO_PA
float	F_TARGET = 8000.0
float	MR_TARGET = 3.5

Detailed Description

Fixed stagnation tanks + feed-system ΔP allocation study (impinging injector).

Tank pressures are **frozen** (not optimized). Layer‑1 searches throat + injector geometry only.

Hydraulic bookkeeping (matches ``engine/core/injectors/impinging.py`` / ``report_pressure_budget_breakdown.py``)::

    P_inj = P_tank − ΔP_feed          (feed model gives ΔP_feed ≥ 0 at the solution)
    ΔP_inj = max(0, P_inj − Pc)       ⇒  P_inj = Pc + ΔP_inj   when P_inj ≥ Pc

    P_tank − Pc = ΔP_feed + ΔP_inj

**Feed loss fraction** (share of tank→chamber static head on each propellant path)::

    f_feed = ΔP_feed / (P_tank − Pc)

Candidates with **effective** negative feed allocation are rejected::
``P_inj > P_tank`` (⇒ ΔP_feed = P_tank − P_inj < 0), or diagnostics ``ΔP_feed < 0``.

Does **not** change Cd discharge models or injector mass-flow equations.

Workflow
~~~~~~~~

1. Run ``run_layer1_optimization`` with ``frozen_parameters`` pinning ``P_O_start_psi`` /
   ``P_F_start_psi`` to the chosen tank pressures.

2. Re-evaluate `layer1_best` + diversified ``iteration_history`` rows at the **same**
   stagnation pressures; extract pressures from ``runner.evaluate`` output.

Example::

  python scripts/study_fixed_tanks_feed_allocation.py \\
    --p-tank-o-psi 644 --p-tank-f-psi 410 \\
    --skip-layer1

Function Documentation

◆ _apply_hist_to_cfg()

None study_fixed_tanks_feed_allocation._apply_hist_to_cfg	(	Any	cfg,
		Dict[str, Any]	h )

protected

Definition at line 95 of file study_fixed_tanks_feed_allocation.py.

References _apply_throat_mm2().

Referenced by _evaluate_feed_row().

◆ _apply_throat_mm2()

None study_fixed_tanks_feed_allocation._apply_throat_mm2	(	Any	cfg,
		float	mm2 )

protected

Definition at line 69 of file study_fixed_tanks_feed_allocation.py.

References max.

Referenced by _apply_hist_to_cfg(), and main().

◆ _evaluate_feed_row()

Dict[str, Any] study_fixed_tanks_feed_allocation._evaluate_feed_row	(	Path	cfg_template,
		Dict[str, Any]	h,
		*	,
		float	P_tank_O_psi,
		float	P_tank_F_psi,
		float	dp_inj_pc_lo,
		float	dp_inj_pc_hi )