| Budget Amount *help |
¥17,030,000 (Direct Cost: ¥13,100,000、Indirect Cost: ¥3,930,000)
Fiscal Year 2015: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2014: ¥9,100,000 (Direct Cost: ¥7,000,000、Indirect Cost: ¥2,100,000)
Fiscal Year 2013: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
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| Outline of Final Research Achievements |
Ice over the surface of bodies in the solar system is an important target for exploration from a viewpoint of the origin of life. The main objective of the study is to clarify the dynamics of the penetrator, which is a spear-type impact probe for investigation of the interior, into ice. The high-speed impact experiment at the maximum velocity about 400 m/s using the ballistic range reveals the characteristic features of the crater forming, motion of fragmented ice pieces, penetration trajectory, distance, stop angle and so on. The flow-through duct is useful for relaxation of the impact force and the sampling device. Based on the experimental results, the semi-empirical analysis model to calculate the force acting on the penetrator and its trajectory was developed. In the hypersonic wind tunnel experiment, it is pointed out that the flow around an ice piece with significant surface sublimation becomes unstable, resulting in dispersion of its trajectory in the atmosphere.
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