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8

— airliners.net; cropped In the photo above (taken in 2011, four years before the Pearl 15 first ran), that feature can also be seen; that engine is in the same family that includes the Pearl 15, the BR700 family. — flickr.com; click image for a closer look In the high-resolution Pearl 15 photo above, that feature is seen to protrude slightly above the ...


10

The turbine blade clearance is the gap between the tip of a turbine rotor blade and the turbine shroud: CFM56-7B HPTACC principle, adapted from Airbus engine systems manual The blade is part of the rotor, and the shroud is part of the stators assembly. The length of a blade and the diameter of the shroud vary with the temperature of gas from the combustion ...


16

High Pressure Turbine Active Clearance Control (HPTACC) is a system that controls the temperature of the shroud of the high pressure turbine rotor (HPT). It can cool or heat the shroud support structure using bleed air from the 4th (relatively cool) or hot bleed air from the 9th stage to control the (tip) gap (or tip clearance) between the rotor (rotating ...


6

Valves open at low speed to prevent the blades to stall. At low spool speed, or a low power setting (low power setting => less fuel added to the cycle => less power in the turbine and as such less power available for the compressor), the volumetric flow through the fixed geometry compressor passage becomes too large (with respect to the design value, ...


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