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The Design – Modelling of Compressor or Pressure Impeller – Cavitation | ANSYS CFX

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This simulation is about a Compressor or Pressure Impeller with cavitation via ANSYS CFX software. We perform this CFD project and investigate it by CFD analysis.

One of the most widely used compressors in the industry is the centrifugal type compressor. This centrifugal compressor, sometimes called impeller compressor or radial compressor, is a sub-class of dynamic axisymmetric work-absorbing turbomachinery.

They achieve pressure rise by adding energy to the continuous flow of fluid through the rotor/impeller. The following equation shows this specific energy input. A substantial portion of this energy is kinetic which is converted to increased potential energy/static pressure by slowing the flow through a diffuser. The static pressure rise in the impeller may roughly equal the increase in the diffuser.

This compressed air then exits radially from the diffuser section around the compressor. Only one of the blades is modeled to simplify and reduce the computational cost due to the compressor’s symmetrical structure and the geometric similarity of the compressor blades.

Each blade’s geometric model consists of an in block (connected to input) and a passage (connected to output). Two covers, called hub and shroud, are placed on either side of each blade; So that the blades are located in the space between the two covers.

The compressor blade rotates around its central axis (x-axis) at a rotational speed of 2500 rpm. The cause of the diffuser in the air path leaving each blade is the increase in air pressure. When the fluid exits the central part of the compressor, it has kinetic energy and potential.

Since the amount of pressure changes in the passing fluid is inversely related to the square of the fluid velocity (according to the Bernoulli relation), it should be tried to reduce the compressor blades’ output velocity to increase the amount of outlet fluid pressure.

This increase in pressure helps to increase the working efficiency of the compressor. Therefore, a diffuser is used in the compressor; Because the cross-section of the fluid passage increases, and with increasing the cross-sectional area of ​​the passage, the passage velocity decreases, and finally, as the fluid velocity decreases, the outlet fluid pressure increases.

This analysis has tried to simulate and analyze the modeling of compressor or pressure impeller-cavitation using ANSYS CFX software.

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The Design – Modelling of Compressor or Pressure Impeller – Cavitation | ANSYS CFX

This simulation is about a Compressor or Pressure Impeller with cavitation via ANSYS CFX software. We perform this CFD project and investigate it by CFD analysis.

One of the most widely used compressors in the industry is the centrifugal type compressor. This centrifugal compressor, sometimes called impeller compressor or radial compressor, is a sub-class of dynamic axisymmetric work-absorbing turbomachinery.

They achieve pressure rise by adding energy to the continuous flow of fluid through the rotor/impeller. The following equation shows this specific energy input. A substantial portion of this energy is kinetic which is converted to increased potential energy/static pressure by slowing the flow through a diffuser. The static pressure rise in the impeller may roughly equal the increase in the diffuser.

This compressed air then exits radially from the diffuser section around the compressor. Only one of the blades is modeled to simplify and reduce the computational cost due to the compressor’s symmetrical structure and the geometric similarity of the compressor blades.

Each blade’s geometric model consists of an in block (connected to input) and a passage (connected to output). Two covers, called hub and shroud, are placed on either side of each blade; So that the blades are located in the space between the two covers.

The compressor blade rotates around its central axis (x-axis) at a rotational speed of 2500 rpm. The cause of the diffuser in the air path leaving each blade is the increase in air pressure. When the fluid exits the central part of the compressor, it has kinetic energy and potential.

Since the amount of pressure changes in the passing fluid is inversely related to the square of the fluid velocity (according to the Bernoulli relation), it should be tried to reduce the compressor blades’ output velocity to increase the amount of outlet fluid pressure.

This increase in pressure helps to increase the working efficiency of the compressor. Therefore, a diffuser is used in the compressor; Because the cross-section of the fluid passage increases, and with increasing the cross-sectional area of ​​the passage, the passage velocity decreases, and finally, as the fluid velocity decreases, the outlet fluid pressure increases.

This analysis has tried to simulate and analyze the modeling of compressor or pressure impeller-cavitation using ANSYS CFX software.

Geometry & Grid

The geometry required for this analysis was generated by Ansys Design Modeler software. The meshing required for this analysis was also generated by Ansys Meshing software. The mesh type used in this analysis is unstructured. The total number of volume properties for geometry is 4,1661e+005 mm³.

Model

In this analysis,  a steady-state analysis type was used to obtain the results to check the fluid flow. In this analysis, non-buoyant models have been used and stationary domain motion has also been activated in this analysis.

Boundary Condition

In this analysis, the flow inlet, which only includes the water at 25 C, is defined as a velocity inlet. The relative pressure value of mass and momentum velocity inlet is 700000 [Pa]. The turbulence of the design modeler is set as a medium with an intensity equal to 5 %.

Discretization of Equations

In this analysis, high-resolution is used for the advection scheme of the basic settings. In this analysis, the first-order is used for turbulence numerics. In this analysis, the residual type of convergence criteria is RMS and the residual target of convergence criteria is 1.E-4.

The results are presented as velocity contours as well as volume rendering.

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