Clearance Control

Clearance Control

In rotating equipment such as compressors, gas turbines and turbochargers, dimensional changes take place between the rotor and stator components because of thermal and mechanical effects during operation. These dimensional changes affect sealing by opening gaps between the blade tips and the casing in gas path systems, and between the seal and housing in labyrinth seal systems. In these applications, clearance control systems can be installed that consist of a sacrificial element and a cutting component. Special thermal spray coatings, called abradables, and honeycomb seals form effective sacrificial systems.

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