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Compressor Inlet Screens

Compressor Inlet Screens

  •  To prevent the engine from readily ingesting any items that can be drawn in the intake, a compressor inlet screen is sometimes placed across the engine air inlet at some location along the inlet duct.
  • Engines that incorporate inlet screens, such as turboprops  and APUs  are not as vulnerable to FOD.
  • The advantages and disadvantages of a screen vary. If the engine is readily subjected to internal
  • damage, as would be the case for an engine having an axial compressor fitted with aluminum compressor blades, an inlet screen is almost a necessity. Screens, however, add appreciably to inlet duct pressure loss and are very susceptible to icing.
  •  Failure due to fatigue is also a problem. A failed screen can sometimes cause more damage than no screen at all.
  •  In some instances, inlet screens are made retractable and may be withdrawn from the airstream after takeoff or whenever icing conditions prevail.
  •  Such screens are subject to mechanical failure and add both weight and bulk to the installation.
  • In large turbofan engines having steel or titanium compressor (fan) blades, which do not damage
  • easily, the disadvantages of compressor screens outweigh the advantages, so they are not generally used.

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