Flow through Pump

Introduction:

The following geometry was created it looks more similar to a real centrifugal pump. Because of better geometry no black flow is observed. It has forward facing vanes.

Setup :

3D simulation

Steady State with Rotation

Water as Fluid

Global Mesh Size - 3 (with advanced edge refinement)

There is a rotation mesh inserted around the impeller (not touching casing) with velocity 1000 rad/s

Boundary Condition : Inlet - Environmental Pressure - 101325; Outlet - Velocity - (varying)

Goal Inserted : Avg Outlet Total Pressure, Equation - \'Avg Outlet Total Pressure/ Inlet Total Pressure\'

Parameteric Study:

Input Parameter : Outlet Velocity - varying 5 - 30, 6 design point

Output Parameter : Avg Outlet Total Pressure & Equation - \'Avg Outlet Total Pressure/ Inlet Total Pressure\'

Result :

No conclusive trend in found in the parameteric study, but a over all decrease is observed which is correspondence with the expected decreasing graph. Performance graph of a centrifugal pump shows decreasing head with increase in mass flow rate with is approximately consistent with the result obtained.

Goal (Value)	Design Point 1	Design Point 2	Design Point 3	Design Point 4	Design Point 5	Design Point 6
Velocity normal to face (Outlet Velocity 1) [m/s]	5	10	15	20	25	30
Inlet Pressure [Pa]	101325	101325	101325	101325	101325	101325
SG Av Total Pressure 1 [Pa]	960053.6184	966037.9557	854052.9565	966970.0365	918442.9573	885931.3455
Pressure Ratio	9.474992533	9.53405335	8.428847338	9.543252273	9.064327237	8.743462576
Mass Flowrate [Kg/s]	1.57	3.14	4.71	6.28	7.85	9.42

The given shows, mass flow rate on x axis and pressure ratio on the y axis

Conclusion :

From the diagram given below, we can clearly see that no back flow is observed.

As expected a approximate steady decrease in pressure ratio is observed.