期刊
JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME
卷 143, 期 7, 页码 -出版社
ASME
DOI: 10.1115/1.4050336
关键词
heat transfer; internal cooling; additive manufacturing; surface roughness; build direction; direct metal laser; sintering; turbulent convective heat transfer
资金
- Siemens Energy
- U.S. Department of Energy National Energy Technology Laboratory
- Department of Energy [DE-FE0031760]
The study investigates the impact of additive manufacturing on channel feature size and build direction, showing significant variations in surface roughness and geometric deviations for distinct build directions and channel sizes, resulting in notable impacts on friction factor and Nusselt number augmentations.
The use of additive manufacturing (AM) processes, such as direct metal laser sintering, provides the design freedom required to incorporate complex cooling schemes in gas turbine components. Additively manufactured turbine components have a range of cooling feature sizes and, because of the inherent three-dimensionality, a wide range of build angles. Previous studies have shown that AM built directions influence internal channel surface roughness that, in turn, augment heat transfer and pressure loss. This study investigates the impact of AM on channel feature size and builds direction relative to tolerance, surface roughness, pressure losses, and convective cooling. Multiple AM coupons were built from Inconel 718 consisting of channels with different diameters and a variety of build directions. An experimental rig was used to measure pressure drop to calculate friction factor and was used to impose a constant surface temperature boundary condition to collect Nusselt number over a range of Reynolds numbers. Significant variations in surface roughness and geometric deviations from the design intent were observed for distinct build directions and channel sizes. These differences led to notable impacts in friction factor and Nusselt number augmentations, which were a strong function of build angle.
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