期刊
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
卷 214, 期 11, 页码 2497-2504出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2014.05.014
关键词
Low pressure cold spray; Syphonage effect; Laval nozzle; Computational Simulation
Instead of injected by high pressure powder feeder, powders can be drawn into the nozzle by syphonage effect generated by supersonic gas flow in low pressure cold spray. This characteristic makes low pressure cold spray conveniently for on-site operation. However, no data have ever been reported on the relationship between the nozzle structures and the gas flow in the powder feeder pipe. In this paper, a CFD software (STAR CCM+) was used to calculate the gas flow in nozzle of the DYMET 413 commercial low pressure cold spray system. Variation of structures and process parameters based on the commercial system were also investigated. The syphonage effect is strongly influenced by the powder feeding location, the temperature and pressure in prechamber has little effect on syphonage effect in powder feeder pipe. The syphonaged gas will decelerate the gas velocity and low down the gas temperature in nozzle, so it is best to control the mass flow rate of powder feeding gas by selecting the location. One of the disadvantages is that the particles will collide with the nozzle wall which makes the nozzle a short service life. (C) 2014 Elsevier B.V. All rights reserved.
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