Damage Assessment Techniques for Turbine Blades: A Review Study

Abstract

This study presents a number of methods for detecting structural damage using modal data and provides a comprehensive overview and evaluation of the stat of the art and progress in vibration based structural damages identification. On the basis of structural dynamic characteristic parameters, various methods for detecting structural deterioration are compiled and assessed. In addition to introducing the concept of damage diagnosis and outlining its potential applications in structural damage detection, also discusses the future directions for structural damage detection. Fouling can reduce performance by altering (the shape of the airfoil), (the inlet angle), (the blades' surface abrasiveness), as well as by (narrowing the airfoil throat). Friction losses and consequent efficiency declines are caused by increased roughness. Blade fouling can be successfully eliminated by performing routine blade cleaning or system flushing (with a carefully chosen solvent. Different hardening processes for gas turbine blades are oxidation, carbonization, nitridation, and laser surface modification. A summary and evaluation of various structural damage detection techniques based on structural dynamic parameter characteristics is provided. The concept of damage diagnosis is introduced, along with its potential applications in the detection of structural damage, and the future directions for structural damage detection are also suggested.