ディスク型SOFCスタックを模擬した積層円板間の流体挙動

抄録

To clarify the fluid behavior in a disk-type SOFC stack, flow velocity and pressure distributions in a branch flow path consisting of stacked parallel disks were measured. First, two different inter-disk channel heights were set in this study, and the velocity fields in each channel were measured and investigated using Particle Image Velocimetry (PIV), and the results were compared with theoretical values as well. The experimental results showed that regardless of the channel height, the flow in midstream and beyond in the parallel-disk channel was generally consistent with theoretical values. On the other hand, the flow velocity on the upper wall of the channel was slightly higher than that on the lower wall, which is considered to be caused by the flow in the center channel turning at a right angle and flowing into the inter-disk channel. This tendency was more pronounced at a channel height of 3 mm. Subsequently, the pressure distribution on the upper and lower walls of the disk along the radial direction was also measured using a micro differential pressure transducer. As a result, the pressure on the upper wall decreases along the radial direction, and this tendency is more pronounced in channels with narrower heights, suggesting that the pressure loss due to wall friction may be increasing. These results suggest the importance of setting appropriate disk spacing.