Convection measurements in scale models of additively manufactured turbine blade cooling passages.

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Abstract

High pressure gas-turbine blades and components are typically constructed with interior cooling air passages. Additive manufacturing processes, such as direct metal laser sintering (DMLS), enable creation of novel turbine cooling internal passages and systems. DMLS uses a laser to systematically melt layers of fine metal powder to create complex geometries. However, the method produces a significant and unique surface roughness. Previous work has served to analyze pressure losses and friction factors associated with the rough surfaces, as well as the velocity profiles and turbulent flow characteristics within the passage. In this study, the heat transfer characteristics of the surfaces were analyzed in internal flow. The overall thermal performance enhancements and friction losses were assessed through calculation of a surface averaged “thermal performance parameter”. The thermal performance results indicate that artificial convective cooling enhancers such as turbulators or dimples may still be required for turbine blade and component cooling.

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Additive manufacturing. Turbine blades. Heat transfer. Enhanced convection.

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