Why are inlet guide vanes hollow?

Why are inlet guide vanes hollow?

• A. To allow hot air from the engine to circulate through the vanes to prevent ice from forming
• B. To reduce weight
• C. To improve electrical grounding
• D. To increase structural rigidity

Answer: (A)

Inlet guide vanes are designed with hollow passages to carry hot air for anti-icing. At the engine inlet, moisture and cold temperatures can cause ice to form on the vane surfaces, especially the leading edges, which disrupts the smooth flow of air into the compressor and can lead to performance loss or surge. By routing hot air from the engine through these hollow channels, the vanes are heated enough to keep ice from forming, maintaining efficient airflow. While making the vanes hollow might change weight a bit, the primary purpose is to provide anti-icing capability. Electrical grounding and increasing rigidity aren’t the reasons for this design.

Inlet guide vanes are designed with hollow passages to carry hot air for anti-icing. At the engine inlet, moisture and cold temperatures can cause ice to form on the vane surfaces, especially the leading edges, which disrupts the smooth flow of air into the compressor and can lead to performance loss or surge. By routing hot air from the engine through these hollow channels, the vanes are heated enough to keep ice from forming, maintaining efficient airflow. While making the vanes hollow might change weight a bit, the primary purpose is to provide anti-icing capability. Electrical grounding and increasing rigidity aren’t the reasons for this design.