Public Member Functions
float	x_critical (self, float gamma)
float	flow (self, float p1, float rho1, float gamma, float dp)
float	capacity (self, float p1, float rho1, float gamma)
float	drop (self, float mdot, float p1, float rho1, float gamma)

Public Attributes
	cv
	bore
	xT

Protected Member Functions
float	_scale (self, float rho1)

Detailed Description

A flow coefficient seen by a gas: IEC 60534-2-1 with the library's scale.

Definition at line 116 of file iec_gas.py.

Member Function Documentation

◆ _scale()

float feedtwin.comps.iec_gas.GasCv._scale	(		self,
		float	rho1 )

protected

``N6 . C . sqrt(rho1)`` in SI: kg/s per sqrt(Pa) at Y = 1.

Definition at line 126 of file iec_gas.py.

References bore, and cv.

Referenced by capacity(), drop(), and flow().

◆ capacity()

float feedtwin.comps.iec_gas.GasCv.capacity	(		self,
		float	p1,
		float	rho1,
		float	gamma )

Choked mass flow [kg/s]: ``Y = 2/3`` at ``x = F_gamma . xT``.

Definition at line 147 of file iec_gas.py.

References _scale(), max, and x_critical().

Referenced by feedtwin.engine.card.InjectorCard.pressure_drop(), and feedtwin.engine.card.InjectorCard.to_dict().

◆ drop()

float feedtwin.comps.iec_gas.GasCv.drop	(		self,
		float	mdot,
		float	p1,
		float	rho1,
		float	gamma )

Pressure drop that passes ``|mdot|`` [Pa].

Up to the choked capacity this is the inverse of :meth:`flow`. Past it no
drop passes the flow -- the caller should pin it at :meth:`capacity` --
and the value returned there is ``x_crit p1 (mdot / capacity)^2``:
continuous at the choke and rising, so a solver iterate that strays past
it is pushed back rather than handed a cliff.

Definition at line 152 of file iec_gas.py.

References _scale(), feedtwin.comps.iec_gas.expansion_drop(), and x_critical().

◆ flow()

float feedtwin.comps.iec_gas.GasCv.flow	(		self,
		float	p1,
		float	rho1,
		float	gamma,
		float	dp )

Mass flow at a drop ``dp`` [kg/s]; the choked value past the choke.

Definition at line 138 of file iec_gas.py.

References _scale(), min, and x_critical().

◆ x_critical()

float feedtwin.comps.iec_gas.GasCv.x_critical	(		self,
		float	gamma )

``F_gamma . xT``: the drop ratio at which the flow chokes, never past
1 (a downstream pressure below zero).

Definition at line 133 of file iec_gas.py.

Referenced by capacity(), drop(), and flow().

Member Data Documentation

◆ bore

feedtwin.comps.iec_gas.GasCv.bore

Definition at line 131 of file iec_gas.py.

Referenced by _scale(), engine.layerx.diag.start.Element.area(), engine.layerx.diag.waterhammer.Pipeline.area(), feedtwin.comps.manifold.ManifoldPort.area(), feedtwin.model.segments.LineSegment.bore_si(), and feedtwin.comps.wall.LineWall.exchange().

◆ cv

feedtwin.comps.iec_gas.GasCv.cv

Definition at line 131 of file iec_gas.py.

Referenced by _scale(), and feedtwin.props.state.ThermoState.gamma().

◆ xT

feedtwin.comps.iec_gas.GasCv.xT

Definition at line 136 of file iec_gas.py.

The documentation for this class was generated from the following file:

lib/feedtwin/feedtwin/comps/iec_gas.py

Public Member Functions

Public Attributes

Protected Member Functions