C222 高速湿り蒸気流中における液滴径の計測と評価式の提案(OS6 液滴衝撃***ージョン)

概要

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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. In a power plant, pipe wall thinning by LDI is observed steam piping system. 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 achieved to enable the evaluation of all the local flow conditions that affect LDI materially. However, to make the LDI prediction code the useful tool in the actual powerplant, more improvement of the present flow evaluation methods are required to be applicable to the wider steam conditions and enable the faster calculations. In this study, for the improvement of the flow evaluation methods, we tried to improve the correlation equation of the droplet diameter and develop the efficient flow calculation code "MATIS-SP". The correlation equation is improved with incorporating the wetness into the equation by the steam experiments with setting the wetness as a parameter. The new code "MATIS-SP" is focused on the steam piping flow and calculates the section-average flow in the piping. This code is 1 dimensional code and can calculate about 103 faster than present 3D code.
一般社団法人日本機械学会の論文
2011-06-22