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Centrifugal Compressor with CFD Simulation by ANSYS Fluent

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The present problem is to simulate a centrifugal compressor with a diffuser using ANSYS Fluent software.

This product includes a Mesh file and a comprehensive Training Movie.

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Description

Project Description

The present problem is to simulate a centrifugal compressor with a diffuser using ANSYS Fluent software. One of the most widely used compressors in the industry is the centrifugal type compressor. This compressor uses positive pressure while using centrifugal force to compress the gas. With the compressor impellers’ rotation, low-pressure air is sucked from the central axis, and its pressure increases. This compressed-air then exits radially from the diffuser section around the compressor. To simplify and reduce the computational cost, and due to the compressor’s symmetrical structure and the geometric similarity of the compressor blades, only one of the blades is modeled.

Each blade’s geometric model consists of two parts, including inblock (connected to input) and 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 (z-axis) at a rotational speed of 800 rpm. The frame motion technique is used to define this rotational motion; This means that it is assumed that the blade, as a boundary, has a rotational movement with a velocity of 0 rpm and the circumference of the passage (passage) and the wall attached to it (hub), has a rotational velocity in the section frame motion at a speed of 800 rpm.

Project Description

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.

Centrifugal Compressor Geometry & Mesh

The present model is designed in three dimensions using Design Modeler software. The model is a centrifugal compressor with blades and a diffuser. Since the model’s geometric shape has symmetrical geometry around its central axis, only one compressor blade has been modeled to reduce the computational cost, and the periodic boundary condition has been used on both sides of each blade.

centrifugal compressor

We carry out the model’s meshing using ANSYS Meshing software, and the mesh type is unstructured. The element number is 303600. The following figure shows the mesh.

centrifugal compressor

Centrifugal Compressor CFD Simulation

We consider several assumptions to simulate the present model:

  • We perform a pressure-based solver.
  • The simulation is steady.
  • The gravity effect on the fluid is ignored.

The following table represents a summary of the defining steps of the problem and its solution:

Models
Viscous k-epsilon
k-epsilon model standard
near wall treatment standard wall functions
Boundary conditions
Inblock-Inflow Pressure Inlet
gauge total pressure 0 pascal
total temperature 300 K
Passage-Outflow Pressure Outlet
gauge pressure 0 pascal
Blade

Passage-Hub

Wall
wall motion moving wall
type of motion rotational
rotational speed 0 rad.s-1
heat flux 0 W.m-2
Inblock-Hub

Inblock-Shroud

Passage-Shroud

Wall
wall motion stationary wall
heat flux 0 W.m-2
Inblock Periodic

Passage Periodic

Periodic
Methods
Pressure-Velocity Coupling SIMPLE
Pressure second order
momentum second order upwind
density second order upwind
turbulent kinetic energy first order upwind
turbulent dissipation rate first order upwind
energy second order upwind
Initialization
Initialization methods Hybrid

Results & Discussions

At the end of the solution process, two-dimensional contours related to pressure and stress are obtained on the compressor blade surface. Three-dimensional contours related to pressure, temperature, velocity, and turbulent kinetic energy have been obtained on the compressor blade. 3D velocity vectors have also been obtained.

There are a Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.

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