| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2014: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Outline of Final Research Achievements |
An instability of a detached shock wave formed in front of a blunt body was investigated by numerical simulations and experiments using a ballistic range toward an engineering application of unsteady shock waves. The experiments successfully demonstrated that the detached shock wave is unstable under low-specific-heat-ratio and high-Mach-number conditions, and the numerical simulations were able to predict the critical condition of the instability. Moreover, the front shape of the projectile equipped with an edge is preferable to destabilize the detached shock wave, and acoustic waves emitted from the edge play a significant role on inducing the instability.
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