| 摘要 |
<p>The aim of the invention is to take an accurate measurement of the erosion of compressors, without removal of the engine, and to provide for simple installation. For this purpose, it has been observed that erosion takes place in the elbow of the cover and the progress of said erosion can thus enable the monitoring of erosion to the other parts of the compressor, in particular the blades of the impeller. Generally, a centrifugal compressor (1) of a gas turbine with a radial air inlet comprises, in particular, an impeller provided with blades and a cover (12) for the flow of air through the impeller blades. The cover (12) is covered with an abradable coating and has an annular area (120, 121) of the elbow (12a) in a substantially median portion. Hollow markings (M1 to M3) of determined depths have been machined in the abradable coating of this area (12a, 120), preferably in groups (G1, G2). Endoscopic examinations are carried out successively to provide an image signal of the markings. Endoscopic signal processing provides a number of remaining markings and a decision criterion for removing the engine is applied to same.</p> |
