Thermal imaging detection of inner channel blockage

Abstract

A method of thermally inspecting an assembly (100) defining at least one internal channel (110, 120). The method includes receiving a sequential sequence of thermal images (712) at at least one exit aperture (122) bounded by the at least one inner channel at the surface (102) of the component. The method also includes delivering pressurized airflow pulses into the at least one inner channel, receiving (1000, 1000a, 1000b, 1000c) temperature response signals as a function of time based on the received thermal images, and determining a temperature response signal one of the derivatives (1001, 1001a, 1001b, 1005), and determining a blockage level of the at least one inner channel based on the first derivative of the temperature response signal.

Description

technical field [0001] The present disclosure relates to thermal imaging detection of passage blockages in objects. Background technique [0002] In order to improve the thermodynamic efficiency of the gas turbine, the high pressure turbine section of the engine can be operated at its highest possible temperature. However, as turbine operating temperatures rise, so do thermal stresses on turbine blade components such as buckets and blades. These stresses can lead to reduced component life and potential failure during operation. Modern aircraft turbine engines, as well as ground-based turbines for power generation, have addressed seemingly divergent requirements for higher operating temperatures and protection and maintenance of turbine blades with significant advances in design, materials, and manufacturing techniques. [0003] Modern turbine blades are generally constructed of superalloys, which offer superior mechanical strength at high temperatures, resistance to creep,...

AI Technical Summary

Problems solved by technology

These methods are generally successful at detecting full or near-complete blockages, but they often fail to detect partial blockages

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