An axial compressor stator vane that is mechanically adjusted to provide optimum compressor performance over a wide operating range is referred to as which of the following?
• Axial compressor airflow and what the stator vanes do to that flow • Difference between inlet guide vanes, stator vanes, and rotor blades • Meaning of the word variable when describing vanes or guides in a gas turbine
• Ask yourself: which component is located in the compressor (not just at the very front) and is designed to change angle with operating conditions? • Think about which term is usually used for vanes that are fixed in place and never move versus vanes that can be repositioned during operation. • Consider which option names the vanes by their location (inlet only) versus by their function (throughout the compressor stages).
• Identify which choice specifically refers to stator (stationary) vanes inside the compressor stages rather than only at the inlet. • Check which terms imply adjustability (can change angle) versus static/fixed. • Verify which component is used to maintain compressor efficiency and prevent stall/surge across a wide RPM range.
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