C215 液滴衝撃***ージョンによる減肉面の形状評価手法の開発(配管減肉評価法(1),OS5 保全・設備診断技術),動力エネルギーシステム部門20周年,次の20年への新展開)

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Liquid droplet impingement erosion (LDI) is defined as an erosion phenomenon caused by high-speed droplet attack in a steam flow. Pipe wall thinning by LDI is sometimes observed in a steam piping system of a power plant. Because LDI usually occur very locally and is difficult to detect, a prediction of LDI location is required for the safety of the plant system. Therefore, as ultimate objectives, we set the development of the prediction tool of LDI location that can use in power plants easily (LDI Prediction Code). In previous researches, we had developed LDI evaluation system, core part of LDI Prediction Code, to organize past achievements and knowledge systematically. This system can evaluate the thinning rate with 1-dimensional flow evaluation within an acceptable time. However, this system cannot evaluate a shape of the thinning surface because the shape evaluation usually needs 3-dimensional calculation. In this study, we tried to develop an evaluation method of the thinning surface shape by LDI within an acceptable time. We first assumed uniform flow distributions at elbow, and the droplet behavior was calculated 1-dimensionally. As a result, comparing with correlation equation developed by 3-dimensional calculations, the collision frequency was non-conservative. Then, we modified the flow distributions at elbow more actually. A correlation equation of the flow distributions was evaluated from 3-dimensional calculations. This is a function of the droplet position, and applied as the modified flow distributions. As a result, the collision frequency was modified and the evaluated surface shape agreed well with that by 3-dimensional calculation.
2010-06-20

著者

森田良
電中研

C215 液滴衝撃***ージョンによる減肉面の形状評価手法の開発(配管減肉評価法(1),OS5 保全・設備診断技術),動力エネルギーシステム部門20周年,次の20年への新展開)

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