| Budget Amount *help |
¥18,460,000 (Direct Cost: ¥14,200,000、Indirect Cost: ¥4,260,000)
Fiscal Year 2015: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2014: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2013: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2012: ¥8,840,000 (Direct Cost: ¥6,800,000、Indirect Cost: ¥2,040,000)
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| Outline of Final Research Achievements |
In order to understand the mechanism of non-axisymmetric wall-thinning in a pipeline of nuclear power plant, the velocity field and mass transfer characterisatics of the pipe due to the flow accelerated corrosion and liquid droplet impingement erosion are studied experimentally and numerically. The results are summarized as follows: 1. The flow downstream of elbow-orifice pipeline shows non-axisymmetric flow behavior, which is due to the combined effect of swirl upstream and the secondary flow in the elbow and orifice. 2. Mass transfer characteristics downstream of the elbow and orifice behaves similar to the flow field. 3. Non-axisysymmetric behavior downstream of orifice can be predicted by numerical method based on the mass and momentum equations combined with the k-εmodel of turbulence. 4. The wall-thinning due to liquid droplet impingement erosion is studied experimentally and the numerical prediction method is proposed.
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