Case Study on Centrifugal Pups

Case study on Reverse blade centrifugal pump

Project type- client confidential

Design:-

Impeller has designed in such a way that the intake mass flow is very high nearly 40000kg of fluid per hour. Working method is same as existing centrifugal pumps but when it comes to inlet diameter is very high when compared with the existing designs. When it comes to normal centrifugal pumps fluid enters thru a small inlet flows through the blades and exit n radial direction but in this case fluid enters thru a large diameter inlet with heavy mass flow and flows through the blades and leaves in radial direction. It has experimentally tested by the developers and numerical assistance has given by me thru this study to validate their experimental studies.

  Model:-

Deign has given by the respected developers due to it confidentiality I am not going to display here.

Mesh Data:-

·         Hexa Elements - Whole Body, Wedge and Tets to connect.

·          98% structured mesh has been achieved.

·         Advanced-proximity and curvature.

·         Number of Elements – 466653.

·         Number of Nodes – 95010.

Solver input data:-

Ø  Water inlet Temperature : 25°C

Ø  Water inlet pipe Suction Pressure : 160 mm of Hg

Ø  Viscosity of the fluid : 0.91 Cp at 25° C

Ø  Vapour Pressure : 24 Torr

Ø  RPM of impeller : 1440

Ø  Atm. Pressure and temperature : 101325 N/m2, 25°C at MSL

Ø  Flow Medium : Water

Ø  Fluid flow rate : 400 meter cube/ hour. or 4, 00,000 kg/hr.

Ø  Water density : 1000 kg/ meter cube.

Ø  Water Head : 20m

Ø  Motor Power : 50 HP

Ø  Mass flow rate of Water : 40000 kg/hr

Ø  Material properties of casing & Impeller : Aluminum alloy

Ø  Density (g/centi meter cube) : 2.6898

Ø  Modulus of Elasticity (GPa) : 68.3

• Poisson’s Ratio : 0.34

Objectives observed in the case study:-

1.      Computation to be carried out at best efficiency point .

2.      Pressure distribution at impeller inlet and  cavitation inception.  

3.      Pressure and Velocity Distribution around the Impeller blade .

4.      Quality of flow, non-uniformity factors , at impeller inlet and outlet recirculation, separation in flow domain .

5.      Total pressure rise, Static pressure rise at impeller outlet.

6.      Cavitation at volute cutwater.

7.      Axial, radial forces.

Results:-