Synthesized feedback for gas turbine clearance control.

摘要

A method for controlling radial clearance in a gas turbine engine (10) uses a mathematical algorithm to synthesize the current clearance delta , including the transient effects of prior engine operations. The synthesized clearance is compared (202) to a schedule of desired clearance (206) for closing delta a cooling air modulating valve (44) as required to avoid rubbing between the rotating blade tips and surrounding shroud. <IMAGE>