Question 138Gas Turbine - Assistant Engineer70% to pass
Why are loose-fitting blades used on the first several stages of large axial compressors?
AI Explanation
The correct answer is B) To minimize vibration while the engine is passing through critical speed ranges.
Explanation:
Large axial compressors in turbine engines can experience vibration issues as the engine's rotational speed passes through certain critical speed ranges. To mitigate this, the first few stages of the compressor use loose-fitting blades. This allows the blades to move slightly and dampen the vibrations, preventing damage to the compressor and other engine components. The loose tolerances on these initial blades help the engine safely traverse the critical speed ranges during startup and operation.
The other answer choices are incorrect because they do not accurately describe the primary reason for using loose-fitting blades in the initial compressor stages.
Related Questions
#136 Which of the following statements is true about an axial compressor disk-type rotor? #137 The primary function of an axial compressor rotor blade is which of the following? #139 What is a compressor midspan shrould? #140 What are the two common forms of axial compressor rotor blade roots? #141 The lube oil system shown in the illustration, is designed to lubricate the main bearings by what principle? Illustration GT-0023