To prevent overheating of the illustrated turbine blade, which of the following fluids is circulated through it via the shaped internal passages? Illustration GT-0029

Correct Answer: Option D — Bleed air.

High-pressure turbine blades operate in temperatures exceeding their melting point. To maintain structural integrity, bleed air is extracted from the compressor and circulated through internal cooling passages within the blades. This film and convective cooling process is essential for the longevity of turbine components in high-performance gas turbines.