What is the diffuser's effect on the incoming air in terms of flow and pressure?

What is the diffuser's effect on the incoming air in terms of flow and pressure?

• A. Increase its temperature
• B. Increase its velocity
• C. Increase its pressure by slowing it down
• D. Remove impurities

Answer: (D)

A diffuser slows the flow and raises the static pressure. As the air passes through a diffuser, the cross-section increases, so the velocity drops. This deceleration converts some of the air’s kinetic energy into static pressure, giving a higher pressure for the next part of the system. That’s why the best description is increasing pressure by slowing the flow. It doesn’t raise temperature, it doesn’t increase velocity, and it isn’t a filter for removing impurities.

A diffuser slows the flow and raises the static pressure. As the air passes through a diffuser, the cross-section increases, so the velocity drops. This deceleration converts some of the air’s kinetic energy into static pressure, giving a higher pressure for the next part of the system. That’s why the best description is increasing pressure by slowing the flow.

It doesn’t raise temperature, it doesn’t increase velocity, and it isn’t a filter for removing impurities.