感圧カプセルの低酸素濃度領域における圧力応答性評価

抄録

To evaluate the pressure response of pressure-sensitive capsules in the hypoxic region, Ru(dpp)3 absorbed in microcapsules (B6C, E2C, B25C and AF6C) were used. The four pressure-sensitive capsules were found to gradually decrease from 0.1 kPa to 1.5 kPa. Comparing these capsules, B25C and AF6C showed better pressure sensitivity. This suggests that the average particle size may affect the pressure sensitivity of the pressure-sensitive capsules. The pressure distribution on the wing of a small rotating blade was also measured by PSP. An area of high pressure was observed on the leading edge of the wing, and an area of low pressure was observed on the trailing edge. Since pressure sensitivity is higher at lower oxygen partial pressures, when a pressure change occurs, the region of high pressure should be wider at lower oxygen partial pressures than at higher oxygen partial pressures. However, the present results show that the regions with high pressure gradient become wider as the oxygen partial pressure increases. This may be due to the fact that even at high pressure sensitivity, at oxygen partial pressures as low as 0.25 kPa, there are fewer oxygen molecules needed for oxygen quenching and the sensitivity to pressure increase is lower than at 0.50 kPa, where there are enough oxygen molecules. The error areas on some of the wings may be due to unevenness created during PSP fabrication; such pigment unevenness during PSP preparation or fan installation may cause significant changes in luminescence intensity, resulting in errors in the image.