Numerical Analysis of Intra-Cavity and Power-Stream Flow Interaction in Multiple Gas-Turbine Disk-Cavities

Abstract

A numerical analysis methodology and solutions of the interaction between the power stream and multiply-connected multi-cavity sealed secondary flow fields are presented. Flow solutions for a multi-cavity experimental rig were computed and compared with experimental data of Daniels and Johnson. The flow solutions illustrate the complex coupling between the main-path and the cavity flows as well as outline the flow thread that exists throughout the subplatform multiple cavities and seals. The analysis also shows that the de-coupled solutions on single cavities is inadequate. The present results show trends similar to the T-700 engine data that suggests the changes in the CDP seal altered the flow fields throughout the engine and affected the engine performance.

Turbomachinery Clearance Control

“…It represents a first attempt at understanding this interaction and at generating data for validation. CFD techniques provide detailed flow field information on complex cavity shapes that cannot be treated with analytical methods (e.g., Athavale et al, 191,192 Chew, 130 Virr et al, 193 and Ho et al 194 ).…”