Patent ID: 7596954
Filing Date: 2009-10-06
Classification: F01D,Y02T

Abstract:
1. A turbine engine comprising: a case structure; a circumferentially segmented shroud within the case structure and comprising a plurality of segments, each segment having an inboard surface portion and mounted for movement between an inboard position and an outboard position; a stage of circumferentially arrayed blades, each blade having an airfoil having an outboard tip in facing proximity to the shroud; one or more springs biasing the shroud segments toward their inboard positions; and one or more valves positioned to vent one or more volumes so as to counter the bias of the one or more springs to shift the shroud segments to their outboard positions, the one or more volumes enclosed by the one or more springs and the shroud segments wherein the one or more springs contact the shroud at an upstream end and a downstream end.