Fundamental Research of Spallation Phenomena

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Spallation particles emitted from an ablating model mounted in a supersonic arc-heated air flow was investigated experimentally and computationally. Emission spectra of CN violet band and C_2 swan band, which were attributed to spallation particles, were identified not only inside the shock layer of the ablator but also outside of it.The picture of spallation particles was tried to be taken, by using an ordinary camera. The picture captured the melted glass fiber ejected from the front surface. In addition, the picture by a high-speed camera also identified the flight of spallation particles.Since the evidence of the presence of spallation particles was found, the trajectory of a spallation particle was simulated to reveal the conditions for the flight to the upstream of the shock layer. The simulation was made by ejecting a solid particle at various speeds from the surface of the ablator.