Compressor classification by flow direction If the airflow through a compressor is predominantly perpendicular to the machine axis, what type of compressor is it?

Introduction / Context:
Compressors are classified by operating principle and by flow direction. The latter gives quick insight into geometry, blade shapes, and specific performance characteristics.

Given Data / Assumptions:

• Flow direction specified as perpendicular to the axis.
• Continuous-flow turbomachine implied.
• No mixed-flow exceptions considered.

Concept / Approach:
Axial compressors carry flow roughly parallel to the shaft axis. Centrifugal (radial) compressors send flow radially outward, which is perpendicular to the axis. Reciprocating and scroll compressors are positive-displacement and are not classified by a single dominant flow direction through rotating stages.

Step-by-Step Solution:
Perpendicular to axis → radial motion dominates.Radial motion is characteristic of centrifugal compressors.Therefore, the correct identification is centrifugal compressor.

Verification / Alternative check:
Machine schematics show impeller eye to tip flow path orthogonal to the shaft centerline.

Why Other Options Are Wrong:

• Reciprocating: positive-displacement piston machine.
• Axial flow: flow parallel to axis.
• “Turbo compressor” is a generic term that includes both axial and centrifugal types.
• Scroll: orbiting spiral PD device.

Common Pitfalls:
Mixing naming by principle (turbo vs. PD) with naming by flow direction (axial vs. radial).

Final Answer:
centrifugal compressor