Abstract
A downscaled model of a steam separator is used to understand characteristics of swirling flow from the viewpoint of the effects of flow restriction ring (FRR) which is installed in a drainage channel. Main conclusions obtained are as follows. (1) Carryunder performance, the weight percentage of entrained gas in the water leaving the separator, improves by narrowing the flow area in the drainage channel using the FRR because it becomes hard to exhaust the gas. On the other hand, (2) the ratio of the separated flow rate to the liquid flow rate may decrease because the liquid phase climbing over the 1st pick-off ring and scattered droplets increase. Therefore, (3) it is necessary to optimize the FRR design based on the gas-liquid separation performance and pressure-loss performance.
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