E111 詳細二相流解析コードTPFITの水噴流に対する検証(I) : 低流量における実験と解析の比較(OS9 熱・流動(解析))

概要

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Collapse of a water jet flowing out from a nozzle to the atmosphere was examined. The flow state of the water jet was recorded with a high speed video camera. The collapse length was derived from recorded images. The radial void fraction distribution in the water jet was also measured with a conduction void probe. The measured results of the void fraction distribution indicated that the region that contains gas phase was formed near the water jet interface. The region spread toward the center of the water jet as the water jet flowed downstream. However, the recorded pictures with the high speed camera revealed that the gas phase was not rolled into the water jet and the gas-water two-phase region was not formed until the water jet disrupted into the lumps of water. The water jet showed the winding shape. The void probe came out of the water jet intermittently since the water jet wound. As a result of it, the void probe superficially detected the existence of the gas-water two-phase region in the water jet. This situation is largely different from what has been believed about the variation of the water jet structure.
一般社団法人日本機械学会の論文
2011-06-22