G050021 粒径分布をもつ溶射粒子のPIVデータに関する考察

抄録

Thermal spraying is one of the successful surface finishing methods that give restoration or a new function on various mechanical components. In the thermal spray process solid particles are accelerated by a high temperature and high velocity gas stream. After impacting on the surface of the substrate, the particles are deformed into a coating. The particle velocity is often measured by Particle Image Velocimetry (PIV). However, the meaning of the velocity vectors, obtained by the PIV with thermal spray powder as seeding particle, is not clear since the solid powder has a wide diameter range. This paper shows the consideration on the PIV data, with thermal spray particle as seeding powder, based on one-dimensional analysis of gas-particle two-phase flow. The calculated results reveal that the velocityobtained by PIV is almost identical to that of the area-average diameter of the seeding thermal spray powder.