What leads airflow into the turbine?

• A. Nozzle guide vanes
• B. Diffuser
• C. Inlet lip
• D. Bleed valves

Answer: (A)

Leading airflow into the turbine is accomplished by nozzle guide vanes. These stationary vanes sit at the turbine inlet and straighten the air coming from the compressor, while also directing it and setting the proper velocity so it strikes the turbine blades at the correct angle. This alignment and velocity are essential for efficient energy extraction from the hot gases and smooth turbine operation. The diffuser sits ahead of the compressor to raise pressure, the inlet lip shapes the intake but doesn’t set the turbine entry flow angle, and bleed valves remove some air to control pressure, not to direct flow into the turbine.