Flow Simulation Project 5 : Centrifugal pump design and analysis

AIM

To design and analyze Centrifugal Pump.

Objective

1. Create a 3D model of a centrifugal Pump.
2. Obtain the relationship between Pressure ratio and mass flow rate (Performance Curve)

Theory

A pump is a device that moves fluids (liquids or gases), or sometimes slurries, by mechanical action, typically converted from electrical energy into Hydraulic energy. Centrifugal pumps are used to transport fluids by the conversion of rotational kinetic energy to the hydrodynamic energy of the fluid flow. The rotational energy typically comes from an engine or electric motor. They are a sub-class of dynamic axisymmetric work absorbing turbomachinery. The fluid enters the pump impeller along or near to the rotating axis and is accelerated by the impeller, flowing radially outward into a diffuser or volute chamber (casing), from which it exits.

The Main parts of Centrifugal Pump are:

1. Impeller
2. Casing
3. Delivery Pipe
4. Suction Pipe with Foot Valve Strainer

Pressure ratio = Outlet total pressure/ Inlet total pressure

CAD Model

Flow Simulation Process :

SOLIDWORKS Flow Simulation is an intuitive Computational Fluid Dynamics (CFD) solution embedded within SOLIDWORKS 3D CAD that enables you to quickly and easily simulate liquid and gas flows through and around your designs to calculate product performance and capabilities.

Parameters

• Internal flow simulation
• Steady state study
• Pressure: 101325KPa
• Temperature: 293.2K
• Medium : Water
• Rotation : On
• Wall conditions: Adiabatic with 0 micrometer roughness,

Boundary conditions

• Inlet pressure : 101325KPa
• Outlet velocity at exit: 10m/s

Steps

1. Model the system using solidworks sketch, boss extrude, sweep and revolve
2. Lids are created at the inlet port and outlet of pump to make the model water
3. Activate the flow simulation plug-in of solidworks in add-ins
4. Select wizard and input respective details including medium as per parameters given above to set the Add rotation in the wizard settings.
5. Set the computational domain to 3D and set the domain in such a way that the simulation result is not
6. Redefine the global mesh for more accurate
7. Insert boundary conditions at inlet and outlet as given
8. Insert cut plot of top plane for velocity and
9. Set surface goals on the lid for Average input and output pressure, also mass flow rate at
10. A new parametric study is Input is given as outlet velocity which varies from 10 to 50 in a step of 10. Outputs are all the surface goals and cut plots. Set iteration = 500 and uncheck all options under calculation control option. Hit run.

Boundary settings

Parametric study settings

Result :

Velocity = 10m/s

Velocity = 20m/s

Velocity = 30m/s

Velocity = 40m/s

Velocity = 50m/s

Performance curves

Animation

Conclusion

1. Outlet velocity is inversely proportional to pressure as outlet velocity increased, total average outlet pressure value gets This can be seen in the contour plots clearly.
2. With increase in Velocity the Average Mass Flow Rate showed a linear variation. With increase in the velocity, the mass flow rate also increases.