Abstract
Forward separation zones formed ahead of axially symmetric spiked blunt bodies facing hypersonic flows are unsteady in nature. This unsteady flow separation leads to pressure fluctuations of high amplitude and frequency. These fluctuations are caused by the mass imbalance between the amount of gas entering the separation zone and the amount of gas leaving it at the point of reattachment [1–3]. Earlier investigations [3–6] on the flowfield around spiked bodies have reported the occurrence of two distinct unsteady flow modes, namely, oscillation and pulsation. Oscillation is typical of longer spikes (1.5 < L/D < 2.5, where L = length of the spike and D = diameter of the forebody) and is characterised by a small change in the size of the conical separated flow region (Fig. 1a). On the other hand, shorter spikes (0.2 < L/D < 1.5) exhibit the unsteady flow regime of second type, pulsation. Pulsation includes the formation of a separation zone at the spike, which grows in size and eventually collapses, and the cycle continues with the formation of a new separation zone (Fig. 1b) [7, 8].
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Balakalyani, G., Sriram, R., Jagadeesh, G. (2017). Shock Tunnel Studies of the Unsteady Hypersonic Flowfield Around Spiked Bodies. In: Ben-Dor, G., Sadot, O., Igra, O. (eds) 30th International Symposium on Shock Waves 2. Springer, Cham. https://doi.org/10.1007/978-3-319-44866-4_74
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DOI: https://doi.org/10.1007/978-3-319-44866-4_74
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