Class 2 (2nd Engineer) MEP 📅 Dec 2024

Exam Question

With reference to main air turbochargers: (16)

(a) Give a reason why binding wire is frequently fitted near the top of the blades,

(b) Mention one fault that occasionally develops with binding wire in service,

(d) Define the cause and identification under running conditions of turbine blade damage

(d) State how (c) can be largely avoided.

Reference Answer

(a) Reason for Fitting Binding Wire Near the Top of the Blades
In a turbocharger, the turbine and compressor rotors rotate at extremely high speeds — typically between 10,000 and 30,000 revolutions per minute (rpm) .
Turbine blades are long, thin, and flexible , and therefore prone to vibration and resonance caused by aerodynamic and centrifugal forces.
To control these vibrations, a binding wire (or lacing wire) is fitted near the tip or upper portion of the blades. This wire passes through small holes drilled near the top of each blade, effectively linking all blades together .

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