B101 オリフィス下流におけるキャビテーション壊食初生評価(流れ加速型腐食・***ージョン・振動,OS6 保全・設備診断技術)

概要

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Cavitation induced vibration and the consequent erosion of pipes are the potential damaging factors in the piping system. In order to prevent such trouble, it is preferable to develop a detection method of cavitation occurrence. Therefore, we investigated detection of cavitation using accelerometers mounted on the outer surface, of apiping. However, in this method, it is difficult to detect incient cavitation, and it is required to comfirm effectiveness of the detection method cavitation. In this study, in order to evaluate incipience of cavitation erosion, we carried out cavitation erosion experiments with alminium specimens and impact force detectors. As the resuts: (1) In the cavitation erosion experiments, the incipient cavitation number, where cavitation erosion pits occured, was 0.8 at 50mm and 75mm downstream of the orifice and 0.7 at 100mm. At those cavitation numbers, the states of cavitation was a developed stage or near the developed stage. (2) In the measurements of impulsive force, the cavitation number, where impulsive force began to increase, almost agreed with the cavitation number at occurrence of erosion pits.
一般社団法人日本機械学会の論文
2009-06-28