Question

In centrifugal compressor, the outlet casing, which comprises a fluid collector is known as

• A. diffuser
• B. impeller
• C. hub
• D. volute

Hint:

Volute helps in pressure recovery by gradually expanding the flow area.

Answer 1

The Correct Option is D

In the context of a centrifugal compressor, the component referred to as the outlet casing, which includes a fluid collector, is known as a volute. In such compressors, the process involves air being drawn into the center of the impeller where it gains velocity and kinetic energy. As the high-speed air exits the impeller, it enters the volute, which is essentially a spiral-shaped area that functions to collect the airflow efficiently.

The volute plays a critical role in transforming this high-velocity airflow into a high-pressure flow, enabling efficient energy conversion necessary for the operation of the compressor. The design ensures a progressive increase in the flow area, which aids in reducing velocity and increasing pressure, crucial for maintaining the performance and efficiency of the compressor.

To summarize:

1. The Diffuser - increases pressure by slowing down the airflow.
2. The Impeller - accelerates the air entering the compressor.
3. The Hub - central part of the impeller where blades are attached.
4. The Volute - collects the fluid and transforms its velocity into pressure.