Which compressor design does not require inlet or discharge valves?

The axial flow compressor is designed to move air or gas axially through the machine, utilizing a series of rotating and stationary blades to achieve compression. One of the defining characteristics of an axial flow compressor is that it operates based on the principle of continuous flow, which means it does not require the use of inlet or discharge valves to control the flow of gas. This design allows for uninterrupted air or gas movement through the compressor, making it efficient for high-flow applications.

In contrast, other compressor types typically rely on mechanical valves to manage the intake of gas and the expulsion of compressed gas. For example, reciprocating compressors use valves to open and close at the appropriate moments during the compression cycle to facilitate gas intake and discharge. Similarly, rotary screw compressors utilize integrated valve systems to manage airflow, while centrifugal compressors depend on high-speed impellers that also require some form of inlet and outlet management.

The unique flow characteristics and operational principles of the axial flow compressor make it distinct in not needing these valves, which is fundamental to understanding its design and application in various industrial processes.