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Thermophysics and Aeromechanics

2014 year, number 1

Control of spray spot in cold spray technology. Part 1. Gas dynamic aspects

V.N. Zaikovskii, S.V. Klinkov, V.F. Kosarev, B.M. Melamed, and G.V. Trubacheev
Khristianovich Institute of Theoretical and Applied Mechanics SB RAS
Novosibirsk, Russia
Keywords: supersonic jet, separation zone, flow swirl, vortex system, gas dynamic cold spray
Pages: 105–112


This paper presents a study of supersonic jets formed by approaches that are new for cold spray technique: the main flow is swirled, the nozzles with permeable profiles and with exit slots on the supersonic section are engineered. The flow swirling achieved in the nozzle prechamber retains downstream to substrate surface. The system of vortices created within the permeable nozzles changes the shock wave features of the overexpanded jet and the geometry of the bow shock wave ahead of the substrate surface. These new features of flow may affect particle motion and particle-substrate interaction under the conditions of cold spray process; this offers tools for obtaining the necessary shape of a spray spot.
DOI: 10.1134/S0869864314010107