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Considering a spacecraft that encounters particle-laden environment, such as dust particles flying up over the regolith by the jet of the landing thruster, high-speed flight of a projectile in such environment was experimentally simulated by using the ballistic range. At high-speed collision of particles on the projectile surface, they may be refle...
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... For convenience of observation and simplicity of analysis, we experimentally simulated the two-dimensional on-plane impact and penetration of a projectile in a sheet of particles. A projectile with the diameter much larger than that of the particle was launched by the ballistic range in the direction on the plane of the granular sheet, which was formed by the free-falling device through a narrow slit [7] [8] in the low-pressure test chamber. The phenomena were observed by the high-speed camera in the direction normal to the particle sheet, as illustrated in Figure 1. ...
... They are originally supplied as the grinding powder with the particle size controlled under the industrial standard, that is, 355 -500 μm for Type #40, 250 -355 μm for #60 and 180 -250 μm for #80. The magnified image of the particles by the microscope showed that the shape of a glass bead was not a smooth sphere but a rugged irregular ball [7] [8]. In addition to the glass beads, the emery powder with the particle size about 400 μm was used for the particle sheet. ...
... However, the diffusion of the fine grains into the trail was much weaker in the case of the hemisphere cylinder model as shown in Figure 9. This was expected to be caused by the presence of the sharp corner at the rear end of the body as pointed out in [8]. Figure 11 shows the effect of the particle size on the granular flow field around a sphere model. ...