Flavien DENIS, Robert HRUSCHKA

DOI Number XXX-YYY-ZZZ

Conference Number HiSST-2022-0337

At hypersonic speed, the metallic parts of flight vehicles are ablated by melting and by oxidation. A novel experimental method is presented, which aims to investigate the ablation by melting in hypersonic impulse facilities. The combination of a low melting point metal with a direct visualization method allows the measurement of ablation profiles in steady hypersonic flows of only two milliseconds. The ablation profiles obtained for a hypersonic flow of nitrogen at Mach 4.5 are presented and discussed. For the tested conditions, the location of the ablation maximum is never located at the stagnation point but rather at 30° from the symmetry axis. Comparisons with CFD simulations demonstrate that the contribution of the ablation by erosion is a secondary phenomenon compared to that of the ablation by melting. Moreover the shape of the ablation profiles can be explained by the laminar-turbulent transition in the boundary layer between the locations of 10◦ and 20◦ from the stagnation point.

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In Categories: HiSST 2022, Hypersonic Fundamentals and History
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