2
مکانیک::
ورودی
The benefits of reduced fuel consumption and increased power arising from increasing the turbine inlet temperature have been clearly brought out in Chaps. 2 and 3.
Despite the higher cost of superalloys, the economic implications of increased temperature at the tur- bine inlet are overwhelming through increased efficiency and power output by the applica- tion of this group of materials.
Fan blades are often subjected to distortion in the airflow from the inlet sec- tion.
The complexity is further emphasized by the number of parameters affecting the aeroelastic stability of a turbine blade: number of blades, blade chord, blade twist and geometry, aspect ratio, stagger, hub/tip ratio, shroud location and angle, incidence angle, blade load, tip speed, pressure distribution, shock posi- tion, inlet Mach number, natural frequency, mode shape, mechanical damping, and blade mistuning.
The forces are set up by the engine stroke, charging system, gas entry at inlet, and nozzle vanes.
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