SUAVE.Attributes.Gases.Steam.Steam Class Reference

Inheritance diagram for SUAVE.Attributes.Gases.Steam.Steam:

Public Member Functions
def	__defaults__ (self)
def	compute_density (self, T=300, p=101325)
def	compute_speed_of_sound (self, T=300, p=101325, variable_gamma=False)
def	compute_cv (self, T=300, p=101325)
def	compute_cp (self, T=300, p=101325)
def	compute_gamma (self, T=300, p=101325)
def	compute_absolute_viscosity (self, T=300, p=101325)

Public Attributes
	tag
	molecular_mass
	gas_specific_constant
Public Attributes inherited from SUAVE.Attributes.Gases.Gas.Gas
	tag
	molecular_mass
	gas_specific_constant
	composition

Detailed Description

Holds constants and functions that compute gas properties for steam.

Assumptions:
None

Source:
None

Member Function Documentation

__defaults__()

def SUAVE.Attributes.Gases.Steam.Steam.__defaults__

(

self

)

This sets the default values.

Assumptions:
None

Source:
Values commonly available

Inputs:
None

Outputs:
None

Properties Used:
None

Reimplemented from SUAVE.Attributes.Gases.Gas.Gas.

compute_absolute_viscosity()

def SUAVE.Attributes.Gases.Steam.Steam.compute_absolute_viscosity	(		self,
			T = 300,
			p = 101325
	)

Gives constant absolute viscosity of 1e-6
WARNING: this value appears to be incorrect
    
Assumptions:
Constant value

Source:
Common value

Inputs:
None

Outputs:
mu0        [kg/(m-s)]

Properties Used:
None

compute_cp()

def SUAVE.Attributes.Gases.Steam.Steam.compute_cp	(		self,
			T = 300,
			p = 101325
	)

Computes Cp by 3rd-order polynomial data fit:
cp(T) = c1*T^3 + c2*T^2 + c3*T + c4
    
Assumptions:
300 K < T < 1500 K

Source:
Unknown, possibly Combustion Technologies for a Clean Environment 
(Energy, Combustion and the Environment), Jun 15, 1995, Carvalhoc

Inputs:
T              [K]       - Temperature
p              [Pa]      - Pressure

Outputs:
cp             [J/kg-K]

Properties Used:
None

compute_cv()

def SUAVE.Attributes.Gases.Steam.Steam.compute_cv	(		self,
			T = 300,
			p = 101325
	)

Stub for computing Cv - not functional

compute_density()

def SUAVE.Attributes.Gases.Steam.Steam.compute_density	(		self,
			T = 300,
			p = 101325
	)

Computes air density given temperature and pressure

Assumptions:
Ideal gas

Source:
Common equation

Inputs:
T         [K]  - Temperature
p         [Pa] - Pressure

Outputs:
density   [kg/m^3]

Properties Used:
self.gas_specific_constant

compute_gamma()

def SUAVE.Attributes.Gases.Steam.Steam.compute_gamma	(		self,
			T = 300,
			p = 101325
	)

Gives constant gamma of 1.33
    
Assumptions:
233 K < T < 1273 K 

Source:
Common value

Inputs:
None

Outputs:
g              [-]

Properties Used:
None

compute_speed_of_sound()

def SUAVE.Attributes.Gases.Steam.Steam.compute_speed_of_sound	(		self,
			T = 300,
			p = 101325,
			variable_gamma = False
	)

Computes speed of sound given temperature and pressure

Assumptions:
Ideal gas with gamma = 1.33 if variable gamma is False

Source:
Common equation

Inputs:
T              [K]       - Temperature
p              [Pa]      - Pressure
variable_gamma <boolean> - Determines if gamma is computed

Outputs:
speed of sound [m/s]

Properties Used:
self.compute_gamma() (if variable gamma is True)
self.gas_specific_constant

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

• /Users/emiliobotero/Dropbox/SUAVE/SUAVE/trunk/SUAVE/Attributes/Gases/Steam.py