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3

What you propose is used as a dust filter for helicopter engines, but even there the plug is not variable. Instead, air spills over the rounded edges of the intake if less is needed. Intake vanes never close to a point where they would block the intake; instead, they direct the flow such that it hits the compressor blades at the desired angle of attack. ...


3

For a compression system operating in normal condition, a mass-flow reduction leads to an increase of pressure rise. By reducing continuously the mass-flow, you reach the point of maximum pressure ratio after which the compressor operates differently. This could bring aerodynamic stall in flow and degrade performance. Rotating stall (often called stall) is ...


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The reason comes down to the principle of operation of the compressors - a centrifugal compressor, as it's name implies, just spins around really fast, and the centrifugal force compresses the air. As you can see in the image below, the vanes of the impeller of a centrifugal compressor just help push the air around in a circle (unlike an airfoil) and ...


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