| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2020: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
|
|---|
| Outline of Final Research Achievements |
Although streamwise vortices become the nucleus for vortical structures of turbulent transition, transitions of the vortices on high-speed flows have not been so known as those on low-speed flows. Compressibility effects suppress a disturbance growth as the mainstream Mach number increases. The present study demonstrated that the cause is related to the growth of entropy fluctuation. It was also shown that vortex breakdown without a stagnation point is caused by a flow acceleration in supersonic flows. Furthermore, it was found that the effect of helicity on instability succeeds in beating the compressibility effects in a high Mach number.
|
