Week 8:Centrifugal pump simulation

Week 8:Centrifugal pump simulation

Introduction:

• Centrifugal pump is a mechanical device which is designed to move a fluid.
• The movement of fluid takes place by means of rotational force of the impellars.
• The fluid enters along the axis of the rotational impellar. The impellar increases the velocity and pressure of the working fluid and it pumps out through the outlet.

Aim:

1. 130 kg/s
2. 156 kg/s
3. 180 kg/s

Geometry:

• Imported a given Centrifugal pump model into Converge Studio.
• CAD clean up was performed.

1. Mesh details:

dx = 12e-3m, dy = 12e-3m & dz = 12e-3m

Case Setup:

• Application: General Flow
• Solver: Transient solver
• Simulation Type: Liquid
• Material: Air
• Species: H2O
• Simulation mode: Full hydrodynamic
• Simulation time parameters:
  Start time:0 sec
  End time:0.2 sec
• Region & Initialization:
  Created a region for initializing the setup
• Boundary conditions
  Inlet - Inflow - Pressure - 101325 pa and Temperature 300k
  Outlet - Outflow
  1.130kg/s
  2.156kg/s
  3.180 kg/s
  Volute - Wall
  Shroud - Wall
  Impellar Rotating wall -12000deg/s along z axis
  Intake runner - Wall
• Turbulence Model - K epsilon
• The time interval for writing 3D output data files: 0.002 sec
• The time interval for writing text output:1e-6 sec
• The time interval for writing restarting output:0.001sec
• Maximum number of restart file saved:3

Results -

1. Massflow rate - 130kg/s

• Total Pressure:

• Torque :

2. Mass flow rate 156 kg/s

• Total Pressure :

• Torque:

3.Mass flow rate 180kg/s:

• Total Pressure:

• Torque:

Pressure ratio vs Mass flow rate:

Efficiency :

Pump efficiency: It is defined as the ratio of the power output of the pump to the power input to the pump.

η=(ρ×g×Q×Hm)/(Pshaft×1000)

Pshaft=(2π×N×T)/60

Conclusion:

Simulation in Centrifugal pump with different mass flow rate was performed.