Functions
object	_measured (str tag)
None	_ethanol (Network net, *tuple[str, float\|None] nodes)
None	test_a_sweep_that_brackets_the_answer_solves ()
None	test_a_capped_measured_stub_back_fills_without_raising ()
None	test_off_the_ends_is_continued_quadratically_and_flagged ()

Variables
float	PSI = 6894.757293168361
	BENCH

Detailed Description

A measured component whose flow-bench sweep does not start at zero.

Flow benches rarely measure at zero flow, and a Newton solve starts every
branch at 1 g/s and probes past the top of any sweep. A measurement that
brackets the operating point must solve, the excursions off its ends are
continued (``dp ~ mdot^2``, the law the curve measures) and flagged, and a solve
asked not to raise never raises.

Function Documentation

◆ _ethanol()

None test_measured_off_curve._ethanol	(	Network	net,
		*tuple[str, float \| None]	nodes )

protected

Definition at line 38 of file test_measured_off_curve.py.

Referenced by test_a_capped_measured_stub_back_fills_without_raising(), test_a_sweep_that_brackets_the_answer_solves(), and test_off_the_ends_is_continued_quadratically_and_flagged().

◆ _measured()

object test_measured_off_curve._measured ( str tag )

protected

Definition at line 30 of file test_measured_off_curve.py.

Referenced by test_a_capped_measured_stub_back_fills_without_raising(), test_a_sweep_that_brackets_the_answer_solves(), and test_off_the_ends_is_continued_quadratically_and_flagged().

◆ test_a_capped_measured_stub_back_fills_without_raising()

None test_measured_off_curve.test_a_capped_measured_stub_back_fills_without_raising ( )

A capped stub is back-filled at exactly zero flow, off the curve.

Definition at line 61 of file test_measured_off_curve.py.

References _ethanol(), and _measured().

◆ test_a_sweep_that_brackets_the_answer_solves()

None test_measured_off_curve.test_a_sweep_that_brackets_the_answer_solves ( )

20 psi across a sweep of 2-32 psi over 0.05-0.2 kg/s: inside the curve
(8 psi at 0.1, 32 at 0.2, so about 0.158 kg/s). The first iterate at
1 g/s used to raise off the bottom of the curve and fail the solve.

Definition at line 46 of file test_measured_off_curve.py.

References _ethanol(), _measured(), and BENCH.

◆ test_off_the_ends_is_continued_quadratically_and_flagged()

None test_measured_off_curve.test_off_the_ends_is_continued_quadratically_and_flagged ( )

Above the sweep the loss keeps its measured ``mdot^2`` shape, and the
diagnostics say the point was not measured.

Definition at line 83 of file test_measured_off_curve.py.

References _ethanol(), _measured(), and BENCH.

Variable Documentation

◆ BENCH

test_measured_off_curve.BENCH

Initial value:

=  Curve(
    x=(0.05, 0.1, 0.2),
    y=(2.0, 8.0, 32.0),
    x_unit="kg/s",
    y_unit="psi",
    source=Provenance.MEASURED,
)

Definition at line 21 of file test_measured_off_curve.py.

Referenced by test_a_sweep_that_brackets_the_answer_solves(), and test_off_the_ends_is_continued_quadratically_and_flagged().

◆ PSI

float test_measured_off_curve.PSI = 6894.757293168361

Definition at line 20 of file test_measured_off_curve.py.

Functions

Variables