A novel design methodology for preventing dislocation in the Zig-zag shroud

Dislocation is defined as the inability of shrouded blades to return to their normal position after deformation caused by an external force. Numerous methods exist for designing shrouds of turbine engines, targeting structural strength, sealing performance, contact interface wear, or damping. However, these designs often fail when dislocation occurs, which is a common issue in engineering. Limited methods focus on preventing shroud dislocation. In this article, we classify the dislocation of zig-zag shrouds into two patterns. A method for calculating the equivalent stiffness of the contact interface is provided to determine the clearance of non-working surfaces. Through a series of static analysis, we introduce a method to adjust the shroud shape and assess its capability in preventing dislocation. All methods are tested on a low-pressure turbine blade.