液滴衝撃エロージョンに及ぼす衝突角度の影響

抄録

In steam piping system containing liquid droplets, pipe wall is sometimes damaged by droplet impingement. One of the most important parameters affecting erosion is impact angle. No research has been conducted for the impact angle dependence on erosion for pipe steels. In this study, jet nozzle was used for the high pressure impingement tests of S15C, SUS304 and STPA24, and spray nozzle for the tests of pure aluminum. The MaxDER (Maximum Depth of Erosion Rate) for these three steels was expressed as sinⁿθ and the exponent is 1.2 - 2.5 irrespective of type of steels. Jet nozzle tests with 90°specimen showed that liquid droplet impingement was weakened possibly due to the liquid film formation. Spray nozzle tests revealed that the erosion can be estimated safely in terms of V=V₀sinθ .