What process does a positive displacement compressor use to handle a charge of free air?

A positive displacement compressor operates by trapping a specific volume of air and then mechanically reducing that volume, which increases the pressure of the trapped air. This process involves two primary actions: the intake (where air is drawn into the compressor) and the compression stage (where the volume is decreased). Once the air has been compressed to the desired pressure, it is then discharged from the unit for use in various applications.

This method of operation is characterized by its ability to maintain a constant flow rate, regardless of the pressure of the system downstream. It is crucial in ensuring that air is effectively compressed and subsequently delivered at a higher pressure. The efficiency and effectiveness of this method make positive displacement compressors widely used in many industrial applications, where consistent air supply and pressure are required.

Other options describe processes that do not accurately reflect the mechanical principles of how positive displacement compressors function. Instead, they may refer to processes employed by different types of compressors or systems. For instance, some may suggest filtering or recycling of air, which is not part of the direct compression method employed by positive displacement units.