Ideal flow rate source (TPF)#

The Ideal flow rate source (TPF) block represents an ideal source of mechanical energy in a two-phase hydraulic network.

The source can maintain a given mass flow rate regardless of the pressure drop.

Important

The block has no flow resistance and no heat exchange with the environment.

A block can operate with or without performing work on the environment.

Law of Conservation of Mass (1) :

(1)#\[\dot m_A + \dot m_B = 0\]

where:

\(\dot m_A\) – mass flow rate at the inlet, [kg/s];

\(\dot m_B\) – mass flow rate at the outlet, [kg/s].

Law of conservation of energy (2) :

(2)#\[\phi_A + \phi_B + \phi_{раб}=0\]

where:

\(\phi_A\) - energy flow at the input, [W];

\(\phi_B\) - energy flow at the output, [W].

\(\phi_{раб}\) – power transmitted to the environment, [W].

If the mode without performing work is selected (3):

(3)#\[\phi_{раб}=0\]

If the mode with isentropic work is selected, then the expression for work (4), (5):

(4)#\[\phi_{раб}=\dot m_A \cdot (h_A - h_B)\]

where \(h_A, h_B\) are the total enthalpies at the input and output, [J/kg].

(5)#\[h=u+ p \cdot v + \frac{v \cdot \dot m^2}{2 \cdot F^2}\]

where:

\(v\) – specific volume, [m\(^3\)/kg];

\(u\) – specific internal energy, [J/kg];

\(p\) – pressure, [Pa];

\(F\) – flow cross-sectional area, [m\(^2\)].

The work of an ideal flow source is isentropic (6) :

(6)#\[s_A=s_B\]

where \(s_A, s_B\) is the specific entropy of the medium at the input and output, [\(\frac{J}{kg \cdot K}\)].

Note

The user can select Source type - Controlled to change the flow rate during the simulation. In this case, the flow rate is determined by the signal sent to the corresponding port.

1. Properties#

Property	Default Value	Description	Units of measurement
Source type: Constant; Controlled	Constant	-	-
Mass flow rate	1.0	-	kg/s
Power added: Isentropic; None	Isentropic	-	-
Input port cross-sectional area	0.01	-	m\(^2\)
Output port cross-sectional area	0.01	-	m\(^2\)

2. Inputs and outputs#

Parameters	Input/Output	Description	Units of measurement	Port type
Input	Input	-	-	Two-phase fluid
Mass flow rate	Input	Available when `Source type` - `Controlled`	kg/s	Automation
Output	Output	-	-	Two-phase fluid

In order to see the connection capabilities of the block, you need to go to page Description of block ports