We present stability analyses for the boundary-layer flow over broad cones (half-angle\ud > 40◦) rotating in imposed axial flows. Preliminary convective instability analyses are\ud presented that are based on the Orr–Sommerfeld equation for a variety of axial-flow speeds.\ud The results are discussed in terms of the limited existing experimental data and previous\ud stability analyses on related bodies. The results of an absolute instability analysis are also\ud presented which are intended to further those by Garrett & Peake through the use of\ud a more rigorous steady-flow formulation. Axial flow is seen to delay the onset of both\ud convective and absolute instabilities
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