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why is it that in modern compressors in gas turbine engines like the J79 the rotor blades are set up at a higher angle of incidence (more aligned to the axial axis) compared to older engines. I also know that modern engines also need bleed air valves or stator actuators or some sort of anti-stall mechanism

is it because the greater the angle of incidence the more room for a higher inlet velocity? or slower higher velocity?...or rpm? something related to one of those.

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  • $\begingroup$ The J79 was designed in the 1950s. I'm not sure that you could really call it "modern" $\endgroup$
    – Daniel K
    Jun 20 at 13:19
  • $\begingroup$ regardless if it is modern or not you are not addressing the answer, it is somewhat to do with the incoming airspeed being managed by some vanes? $\endgroup$ Jul 20 at 1:00

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