Modelling of gas flow through a throttle¶
This example demonstrates the changing characteristics of gas flow through a choke, which is modelled using the Local Restriction (G) block. The Controlled Reservoir (G) blocks are used to define the boundary conditions.
Till 1 second there is no gas flow. The mass flow rate increases as the pressure at the throttle outlet decreases. By 3.3 seconds the flow is restricted. The mass flow rate depends only on the inlet pressure, so a further decrease in outlet pressure does not increase it further. However, 6 seconds after the start of the simulation, increasing the inlet pressure again leads to an increase in the mass flow rate.
Schematic of the model:¶
Simulation results:¶
Mass flow rate through the throttle:
Change in inlet and outlet pressures of the throttle:
Mach number in the throttle:
