BWR模擬流路内の気液二相環状流に及ぼすスペーサ燃料棒固定用突起の影響

抄録

This study investigated experimentally the effect of the fuel rod fixing protrusions on the grid spacer on the pressure loss and the liquid film thickness around the rod in air-water two-phase flow in simulated BWR fuel rod bundle channel. From the investigation, the following findings were obtained; (a) there was almost no change in pressure loss with or without the protrusions, (b) the liquid film around the rod downstream of the spacer becomes thicker when there is the protrusion. As a result, the effect of the protrusions on the gas-liquid two-phase flow is found to be favorable at the power output, where the pressure drop was small and the liquid film thickness was large.