Centrifugal pump design and analysis

Aim:Obtain the relationship between Pressure ratio and mass flow rate for q centrifugal pump

INTRODUCTION:

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.

INPUT PARAMETERS:

Impeller dia- 0.02m

Outer casing dia-0.05m

Inlet pipe length-0.05m

Outlet pipe length - 0.06m

PARAMETERS FOR BASE LINE SIMULATIONS:

Analysis type- Internal

Fluid used- Water

Type of flow- Laminar and Turbulent

Rotation type- Local Region Averagina

Boundary conditions for inlet - 1bar

3D MODEL of Centrifugal Pump:

PROCEDURE:

1. Create a 3D model of Centrifugal Pump with given input dimensions.
2. Consider Total numbers of blades is 6.
3. Lids are created at both ends of inlet and outlet
4. Rotating region is selected and the speed is set to 1000rpm.
5. Create a new flow simulation project and Insert Boundary conditions as Inlet as Environmental pressure 1 bar .
6. consider outlet velocity as 10 m/s.
7. Add surface goals of mass flow rate and To change the different outlet velocity.
8. Parametric study is done with the velocity values of 10m/s, 15m/s, 20m/s, 25m/s, 30m/s in Input variables.
9. For Output parameters adding surface goal of total pressure inlet, total pressure outlet, mass flow rate at 1 kg/s.
10. The Cut plot of pressure and velocity is added.
11. Total pressure at inlet, total pressure at outlet to find pressure ratio.
12. Atlast make a Flow Trajectories for Pressure and Velocity.
13. Used 500 Iteration to run each and every study.

OUTPUT:

Outlet velocity with different velocity conditons and there cutplots

Velocity and pressure for 10m/s.

VELOCITY AND PRESSURE TRAJECTORY AT 10M/S

VELOCITY AND PRESSURE AT 15m/S

FLOW TRAJECTORY AT 15m/s

VELOCITY AND PRESSURE AT 20m/

FLOW TRAJECTORY AT 20m/s

VELOCITY AND PRESSURE AT 25m/s

FLOW TRAJECTORY AT 25m/s

VELOCITY AND PRESSURE AT 30m/s

FLOW TRAJECTORY AT 30m/s

OUTPUT FOR EACH CASE:

PLOT :

INLET PRESSURE VS VELOCITY:

PLOT:

VELOCITY VS MASS FLOW RATE:

PLOT:

PRESSURE RATIO VS MASS FLOW RATE:

PLOT :

CONCLUSION:

• When Outlet velocity gets increased, pressure value gets decreased.
• Mass flow rate values are not stable it differ form different velocity for this model.