Topological modifications due to ramped vanes in a flare-induced shock–boundary layer interaction flowfield

Nilavarasan, T.; Joshi, Ganapati; Misra, Anuradha; Manisankar, C.; Verma, Shashi B.

doi:10.1007/s12650-020-00735-x

Cited by 5 publications

(2 citation statements)

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“…Bringing the devices very close to the interaction may not provide enough room for the vortices to develop completely, resulting in an inadequate boundary layer mixing. 68 On the other hand, placing them too far upstream may result in vortex decay and lift off, [69][70][71] which will reduce their impact on the interaction. When employing an array of MVGs, it is vital to provide an optimal inter-device spacing between the adjacent devices.…”

Section: Introductionmentioning

confidence: 99%

“…76 Various innovative designs [77][78][79][80] have also been proposed in recent years to control shockinduced separations, but to the best of our knowledge, these different shapes have not been studied in compression corner flows. There also seems to be very few published studies 63,67,71,81 that report the effect of MVGs on axisymmetric flare-induced separations. Keeping these factors in mind, the present study focusses on evaluating the performance of five different MVG shapes, in controlling the flow separation due to a flare-induced SBLI.…”

Section: Introductionmentioning

confidence: 99%

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Performance evaluation of different micro vortex generators in controlling a flare-induced shock–boundary layer interaction

Nilavarasan

Joshi

Misra

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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This study evaluates the ability of five micro vortex generator (MVG) geometries in attenuating the flow separation induced by an axisymmetric compression corner. Experimental and computational investigations were carried out at Mach 2 on a cone–cylinder–flare model, with a flow deflection angle of 24° at the cylinder/flare juncture. The MVG shapes considered were baseline ramp, trapezoidal ramp, split ramp, thick vanes and ramped vanes. A circumferential array of these MVGs having a device height (h) of 1.4 mm and an inter-device spacing of 10.5 mm (7.5 h) was introduced 50 mm upstream of the compression corner. Streamwise counter-rotating vortex pairs that originated from these devices created alternate bands of upwash and downwash regions in the incoming boundary layer, which resulted in suitable three-dimensional alterations of the separation region’s size. Furthermore, surface streamline visualizations showed that the vortices induced profound topological transformations in the separated flow structure. In the absence of MVGs, spectral analysis of the pressure signal obtained from the separation shock’s intermittent region revealed a relatively broadband dominant frequency range of 0.55 kHz–0.9 kHz. The MVGs did not cause any significant change in the dominant frequency, but made the bandwidth slightly narrower. Among the different MVG designs that were studied, the ramped vanes (RV) induced the most momentum augmentation in the near wall region and thereby caused the maximum downstream shift in the separation shock’s position.

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