G0500-5-5 水冷式2段高速フレーム溶射ガンの直管部における摩擦チョーク条件に関する一次元解析([G0500-5]流体工学部門一般講演(5))

概要

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Thermal spraying is one of the most effective surface coating technologies. The authors developed a cutting-edge thermal spray gun; the water-cooled two-stage HVOF thermal spray gun. The gun has a long water-cooled passage of supersonic hot gas. Therefore, the gun could be operated at the frictional choking condition, which is expected to decrease the velocity of the spray particles. It is experimentally well known, in general, that the larger impact velocity of the particle at the substrate results in better coating quality. In this study, therefore, the gas flow as well as the particle velocity of the water-cooled two-stage HVOF thermal spray gun is investigated by using one-dimensional analysis, which takes into account of the pipe friction and heat transfer. The operating conditions which occur the frictional choking are clarified in this research.
一般社団法人日本機械学会の論文
2010-09-04