High reaction vs. low reaction compressor stage

Reaction is one of three non-dimensional numbers used to describe a compressor stage. It is defined as the enthalpy change over the rotor divided by the enthalpy change over the entire stage. Basically it expresses where the work done in moving the fluid is done: across the rotor or across the stator.




Figure 1: Low reaction compressor stage


Shown in the Figures 1 and 2 are example blade geometry for a low reaction compressor stage where the work of moving the flow occurs on the stator blades and a high reaction compressor stage where the work done of moving the flow occurs on the rotor blades. Note that high reaction compressor blades have the exit flow that is mostly axial. This type of compressor stage is ideal for a single stage ducted fan.




Figure 2: High reaction compressor stage

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