The compressor stages include how many axial stages?

The compressor stages include how many axial stages?

• A. Two axial stages
• B. Four axial stages
• C. Five axial stages
• D. Seven axial stages

Answer: (C)

Compression is built from multiple axial stages to raise air pressure gradually and keep the flow stable across a wide power range. In the UH-60’s engine, the axial portion of the compressor consists of five stages, which handle the majority of the pressure rise. After those five axial stages, a centrifugal (radial) stage finishes the compression to reach the required overall pressure ratio in a compact package suited for a helicopter powerplant. This arrangement provides a good balance of efficiency, surge margin, and physical size for helicopter use. Fewer axial stages would require a larger final stage or reduced stability, while more axial stages would add unnecessary weight and complexity without proportional benefit.

Compression is built from multiple axial stages to raise air pressure gradually and keep the flow stable across a wide power range. In the UH-60’s engine, the axial portion of the compressor consists of five stages, which handle the majority of the pressure rise. After those five axial stages, a centrifugal (radial) stage finishes the compression to reach the required overall pressure ratio in a compact package suited for a helicopter powerplant. This arrangement provides a good balance of efficiency, surge margin, and physical size for helicopter use. Fewer axial stages would require a larger final stage or reduced stability, while more axial stages would add unnecessary weight and complexity without proportional benefit.