An Erosion In Centrifugal Fan CFD simulation is a very important tool for heavy industries. Centrifugal fans are powerful machines used in places like cement factories and power plants. Their job is to move large amounts of air. The problem is that this air is often dirty and full of hard, tiny bits of material like sand or dust. This is a big challenge for Turbomachinery Erosion CFD. As the fan spins very fast, it throws these hard particles against its own parts. Over time, these particles act like tiny sandpaper, wearing away the fan’s metal blades and casing. This damage is called erosion.

Erosion is a very serious problem. It can weaken the fan, make it less powerful, and eventually cause it to break down completely. A broken fan can stop an entire factory from working, which costs a lot of money. This report shows how we can use a computer simulation in ANSYS Fluent to look inside a working fan and see exactly where the erosion will happen. By predicting these weak spots, engineers can design stronger fans that last longer. They can also plan for repairs before the fan ever breaks. This study is based on real-world research to make sure our results are accurate [1, 2].

• Reference [1]: Aldi, Nicola, et al. “Erosion behavior on a large-sized centrifugal fan.” 13 th European Conference on Turbomachinery Fluid dynamics & Thermodynamics. European Turbomachinery Society, 2019.
• Reference [2]: Evaluation of the Wear-Resistant Plate Performance on Different Locations over the Flow Path of a Large-Sized Heavy-Duty Centrifugal Fan

Figure 1: A simple diagram showing the main parts of a Centrifugal Fan used in industries.

Simulation Process: How We Simulate Fan Erosion in ANSYS Fluent

To study the Erosion In Centrifugal Fan Fluent simulation, we first need a good computer model. The 3D model of the fan and its casing is shown in Figure 2. The simulation has two main jobs: it must model the spinning fan and it must model the dust particles. To model the fan’s rotation, we use the Multiple Reference Frame (MRF) method. This tells the computer that the area around the fan is spinning, while the outer casing is still. To model the dust, we use the Discrete Phase Model (DPM). This model lets us inject thousands of virtual dust particles into the air. The computer then calculates the path of each particle as it flies through the fan. Finally, we turn on a special Erosion sub-model in Fluent. This model uses the DPM information to predict where the particles will hit the surfaces and how much metal they will wear away.

Figure 2: The 3D geometry model of the fan and casing used for the Erosion CFD simulation in ANSYS Fluent.

Post-processing: CFD Analysis, Following the Destructive Path of a Particle

The simulation results tell a clear story of cause and effect, showing exactly how the fan’s operation leads to its own destruction. The main cause of everything is the fan’s high-speed rotation. The direct effect is that the fan grabs the air and particles and throws them outwards at very high speeds. The velocity contour in Figure 3 is the perfect proof of this. It shows that the air speed is low at the center (in blue) and becomes extremely fast (in red, up to 160 m/s) at the tips of the impeller blades. This high-speed air acts like a highway, carrying the hard dust particles along with it. The streamlines in Figure 4 show the exact path this fast-moving, particle-filled air takes.

Figure 3: Velocity contour from the Centrifugal Fan CFD simulation, showing very high air speeds (red) at the blade tips

This high-speed journey is the cause of the next, critical effect: hard impacts. The fan’s job is to push air through a curved path. Air is very light, so it can make these turns easily. But the dust particles are much heavier. They have more inertia, which means they want to keep going in a straight line. When the air makes a sharp turn around the blade edges or inside the volute casing, the heavy particles cannot turn fast enough. The effect is that they fly straight and slam into the fan’s surfaces. The most important achievement of this Erosion Fluent analysis is that it creates a clear and precise map that connects the flow path to the damage. The DPM erosion rate contour in Figure 5 shows the exact hotspots (in red) where the particles hit the hardest. We can see that the damage is not random; it happens right where the flow analysis predicts it should—on the leading edge of the blades and on the “cutwater” part of the casing where the flow changes direction suddenly. This map allows engineers to protect these specific, vulnerable areas with stronger materials, leading to fans that are more reliable and last much longer in harsh environments.

Figure 4: Airflow streamlines showing the path of particles in the Turbomachinery Erosion CFD analysis.

Figure 5: The DPM Erosion Rate contour, clearly identifying the high-wear hotspots (red) on the fan impeller and casing