[T11]  PM Technologies to Support Future Society

[16C-T11-09] Exploring Surface Roughness Effects on Spray Performance in Metal Additive Manufactured Spray Nozzles for Gas Turbine Applications

*E. Tuneskog¹, L. Nyborg¹, K.-J. Nogenmyr², D. Moëll² (1.Chalmers University of Tehcnology, Sweden, 2.Siemens Energy AB, Sweden)

キーワード：Metal Additive Manufacturing, Gas Turbine, Spray Nozzles, Powder Bed Fusion-Laser Beam, Binder Jetting

Metal additive manufacturing (AM) enables the design of complex spray nozzles for gas turbine applications. Despite its advantages, AM nozzles display higher surface roughness than conventional counterparts, adversely affecting spray performance through increased droplet size and the promotion of non-circumferential sprays. Design enhancements are believed to mitigate the surface roughness limitations, thereby enhancing the overall performance of the nozzle. However, surface roughness is highly dependent on the AM method chosen to produce the nozzles. This study provides a baseline for the correlation between surface roughness and spray performance for plain orifice spray nozzles manufactured by Binder Jetting (BJ-M) and Powder Bed Fusion – Laser Beam (PBF–LB). The droplet size in plain orifice spray nozzles correlates with surface roughness, leading to inferior and unreliable performance in PBF-LB nozzles compared to BJ-M. The primary cause lies in adhering powder particles on the nozzle outlet surface.