A weave design to enhance heat transfer and reduce thermal stresses

Adam M Weaver, Purdue University

Abstract

The trailing-edge region of turbine airfoils is particularly vulnerable to thermal damage. In this paper, a new design - referred to as the Weave design - is presented to improve cooling in this thin critical region. CFD conjugate analysis based on the shear-stress transport (SST) turbulence model is used to explore, develop and assess this new design. Development of the design is done by separately analyzing each of the concepts that are present in the geometry and validating their contribution. The Weave design is then compared to three existing designs, and is shown to provide more effective, efficient, and uniform heat transfer. In assessing the Weave design, the temperature, pressure and mass flow rate were selected to reflect realistic engine operating conditions, and air was modeled as a thermally perfect gas with temperature dependent properties. A discussion is presented on the nature of the flow induced by the design features and how that flow distributes the heat transfer to the turbine material. Results are also compiled to provide insight into overall heat transfer, pressure losses, and mass flow required, as well as temperature distribution within the solid material.

Degree

M.S.E.

Advisors

Shih, Purdue University.

Subject Area

Aerospace engineering|Mechanical engineering

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