functiondp_tau_nominal_flow
Pump model with the nominal massflow model
Extends from partial_dp_tau (Compute dp and tau_st of a TurboComponent from the current state).
Information
Model that computes nominal volume flow and has a linear factor that determines the pressure generated linearly from the difference of actual volume flow V_flow and nominal volume flow V_flow_nominal = A*l*omega = V_r*omega.
The static moment has two parts. The first is the work performed on the fluid. The second term describes linear friction with the friction factor k_fric.
Parameters V_r "Reference Volume", k_fric "friction coefficient" and k_p "pressure coefficient" can be set directly or by setting a design point of operation (angular velocity, pressure head, volume flow, slip and efficiency).
Inputs
| Type | Name | Default | Description |
|---|---|---|---|
| Medium.MassFlowRate | m_flow (from partial_dp_tau) | Mass flow rate | |
| SI.AngularVelocity | omega (from partial_dp_tau) | Angular velocity | |
| Medium.ThermodynamicState | state_in (from partial_dp_tau) | Inlet state | |
| Medium.MassFlowRate | m_flow_norm (from partial_dp_tau) | Normalization mass flow rate | |
| SI.AngularVelocity | omega_norm (from partial_dp_tau) | Normalization angular velocity | |
| SI.Density | rho_min (from partial_dp_tau) | Minimum density (relevant at p=0) | |
| Boolean | parametrizeByDesignPoint | false | = true, if pump characteristic curve is computed from one design point |
| SI.Pressure | dp_D | 500000 | Design pressure difference |
| SI.VolumeFlowRate | V_flow_D | 0.0016666666666667 | Design volume flow rate |
| SI.AngularVelocity | omega_D | 314.2 | Design angular velocity |
| Real | slip_D | 0.5 | Design slip ((V_flow_nominal-V_flow)/V_flow_nominal) |
| Real | eta_D | 0.75 | Design efficiency |
| SI.Volume | V_r_input | 0.0001 | Reference volume of pump |
| Real | k_p_input | 1e5 | Linear pressure factor |
| Real | k_fric_input | 1e-2 | Linear friction factor |
Outputs
| Type | Name | Default | Description |
|---|---|---|---|
| SI.Pressure | dp (from partial_dp_tau) | Pressure difference | |
| SI.Torque | tau_st (from partial_dp_tau) | Steady state torque |