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مکانیک::
ردیف پره
When blade rows in a turbine are operating close to resonance conditions, they are prone to failure from high-cycle material fatigue.
Excitation is encountered due to two primary reasons: (i) flow path interference between stator and rotor blade rows at nozzle passing frequencies and (ii) manufacturing and assembly errors at per rev- olution harmonics.
Turbine blade metal temperatures may achieve a reduction of 200 to 300C by channeling 1.5-2.0 percent of the airflow for cooling for each blade row.
The ratio of number of vanes to blades is nearly 2/3, and so the pitch of the blade row is adjusted in the same proportion.
Clocking, or indexing, refers to circumferential adjustments in the position of consecutive stator or rotor blade rows with the same airfoil count.
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