Centrifugal pump design and analysis
AIM:-
To create a 3D model of a centrifugal pump, run a baseline flow simulation and perform a parametric studies for different velocities design point.
INTRODUCTION:-
In this project I am going to run a simulation of water flowing through a centrifugal pump with different velocities at outlet and inlet atmospheric pressure condition and perform a parametric study with animation of flow pattern.
THEORY:-
A centrifugal pump is a mechanical device which is used to transport fluids by the conversion of rotational kinetic energy to hydrodynamic energy of the fluid flow. Impellar is the main part and play a vital role in its working.
Pressure ratio is the ratio between the outlet pressure and inlet pressure.
Thus, ‘Pressure ratio’ = outlet total pressure / inlet total pressure
PROCEDURE:
Input parameters for baseline simulation:
Analysis type = Internal flow
Working fluid = water
Flow type = laminar and turbulent
Rotation type = local region averaging
Boundary condition at inlet = atmospheric pressure
Boundary condition at outlet = Exit velocity is 10 m/s
First of all, I created a 3D model of the centrifugal pump with rotor, then added lids to inlet and outlet. Then ran simulation wizard with above stated input parameters. Rotating region is added and rotational speed was set to 1000 rpm. Surface goal was set to Avg. total pressure and the number of iterations was set at 500.
Fig. showing 3D model of Centrifugal pump:
Flow Trajectory ANIMATION at baseline simulation:
OBSERVATION:-
Goal OUTPUT data:
(1). Design point 1 at 10 m /s
Velocity plot:
Pressure Plot:
(2). Design point 2 at 15 m /s
Velocity plot:
Pressure Plot:
(3). Design point 3 at 20 m /s
Velocity plot:
Pressure Plot:
(4). Design point 4 at 25 m /s
Velocity plot:
Pressure Plot:
(5). Design point 5 at 30 m /s
Velocity plot:
Pressure Plot:
Data showing PRESSURE ratio at different output flow parameters:
Corresponding graph
Relationship between ‘pressure ratio’ and ‘mass flow rate’
NOTE:- negative (-) sign indicates that water is leaving the domain at outlet.
RESULT:-
Upon simulation and performing parametric studies for different outlet flow rate it is found that as the inlet condition is same in all the cases i.e. atmospheric pressure, but as the output flow rate is increased from 10 to 15 to 20 and so on, outlet pressure decreased thus pressure ratio also decreased.