Bluntness Effects on Perturbation Growth in Hypersonic Ogive-Cylinder Boundary Layers

What is it about?

A combination of linear stability and numerical simulation is used to systematically investigate flow instabilities and transition mechanisms over ogive-cylinder forebodies, with emphasis on the effects of varying nose bluntness. The second mode demonstrates a significant decrease in growth rate with increasing bluntness. Wave obliqueness indicates growing instability for the first mode, especially in the case of blunter geometry, but was inadequate to induce transition. Spanwise numerical forcing inhibits oblique characteristics and relates to the development of the spanwise coherent high-frequency lobe identical to Mack second-mode wave.

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