Shock/boundary-layer interaction control with vortex generators and passive cavity

McCormick, D. C.

doi:10.2514/3.11323

Cited by 190 publications

(65 citation statements)

References 5 publications

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“…The micro-ramp is a recently developed novel flow control device [3][4][5][6]. It is a part of the micro-vortex generator family that has shown potential in solving the adverse phenomena.…”

Section: Introductionmentioning

confidence: 99%

Micro-Ramps for Hypersonic Flow Control

et al. 2012

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Shock/boundary layer interaction (SBLI) is an undesirable phenomenon, occurring in high-speed propulsion systems. The conventional method to manipulate and control SBLI is using a bleed system that involves the removal of a certain amount of mass of the inlet flow to control boundary layer separation. However, the system requires a larger nacelle to compensate the mass loss, larger nacelles contribute to additional weight and drag and reduce the overall performance. This study investigates a novel type of flow control device called micro-ramps, a part of the micro vortex generators (VGs) family that intends to replace the bleed technique. Micro-ramps produce pairs of counter-rotating streamwise vortices, which help to suppress SBLI and reduce the chances of flow separation. Experiments were done at Mach 5 with two micro-ramp models of different sizes. Schlieren photography, surface flow visualization and infrared thermography were used in this investigation. The results revealed the detailed flow characteristics of the micro-ramp, such as the primary and secondary vortices. This helps us to understand the overall flow physics of micro-ramps in hypersonic flow and their application for SBLI control.

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“…The micro-ramp is a recently developed novel flow control device [3][4][5][6]. It is a part of the micro-vortex generator family that has shown potential in solving the adverse phenomena.…”

Section: Introductionmentioning

confidence: 99%

Micro-Ramps for Hypersonic Flow Control

et al. 2012

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“…The micro-ramp is one particular type of SBVGs, which has been shown to reduce the length of the separated region, causing a more abrupt pressure rise (see, e.g., [11][12][13]), as well as a stabilization of the interaction region [14]. Although experimental studies (see [15,16]) suggest that vane-type SBVGs may be more effective in suppressing separation, micro-ramps offer the advantage of being more rugged, therefore less subject to mechanical failure, which is essential for engine intake applications.…”

Section: Introductionmentioning

confidence: 99%

Effects of Micro-Ramps on a Shock Wave/Turbulent Boundary Layer Interaction

Blinde

Humble

Oudheusden

et al. 2009

39th AIAA Fluid Dynamics Conference

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Stereoscopic particle image velocimetry is used to investigate the effects of micro-ramp sub-boundary layer vortex generators, on an incident shock wave/boundary layer interaction at Mach 1.84. Single-and double-row arrangements of micro-ramps are considered. The micro-ramps have a height of 20% of the unperturbed boundary layer thickness and the measurement planes are located 0.1 and 0.6 boundary layer thicknesses from the wall. The micro-ramps generate packets of individual vortex pairs downstream of their vertices, which produce counter-rotating longitudinal streamwise vortex pairs in a time-averaged view. These structures induce a pronounced spanwise variation of the flow properties, namely the mixing across the boundary layer interface. The probability of reversed-flow occurrence is decreased by 20 and 30% for the single-and double-row configurations, respectively. Both configurations of micro-ramps stabilize the shock motion by reducing the length of its motion by about 20% in the lower measurement plane. The results are summarized by a conceptual model describing the boundary layer's and interaction's flow pattern under the effect of the micro-ramps.

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“…Passive control approaches such as cavities [10], vortex generators [11][12][13], micro-ramps [14], and strakes [15] are effective in reducing SWBLI unsteadiness; however, these approaches are effective only in limited operational condition and can cause unfavorable effects in off-design operation. Active control approaches such as energy deposition [16,17] and jet injection [18,19] can widen the effective operational ranges because the operational conditions can be tuned to the flow conditions.…”

Section: Introductionmentioning

confidence: 99%

Suppression of Low-Frequency Shock Oscillations over Boundary Layers by Repetitive Laser Pulse Energy Deposition

et al. 2016

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Abstract:The effect of repetitive energy deposition on low Strouhal number oscillations of the shock wave induced by boundary-layer interaction over a cylinder-flare model was studied. The fluctuation of the energy deposition frequency was induced in the flow, because the bubble generated by the energy deposition flowed downstream along the surface repeatedly. The region before the bubble size was affected by the energy deposition directly, so the fluctuation frequency was equal to the energy deposition frequency. However, the flare shock behavior at a position farther from the surface than the bubble size was also affected strongly by the energy deposition. For low-frequency unsteadiness and the effect of energy deposition on its unsteadiness, two categories have been observed. In the relatively small flare angle case, the flare shock was oscillated owing to the fluctuation induced by the boundary-layer interaction at the shock foot, and its oscillation occurred at 2.1 kHz with a small amplitude. The amplitude of this oscillation was decreased by highly repetitive energy depositions, and its amplitude could not be detected at a highly repetitive energy deposition. In the longer cylinder section case, the region of the shock-wave interaction was widened, and the amplitude of the flare shock oscillation was increased. In this case, the amplitude drastically decreased because of energy deposition.

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Shock/boundary-layer interaction control with vortex generators and passive cavity

Cited by 190 publications

References 5 publications

Micro-Ramps for Hypersonic Flow Control

Micro-Ramps for Hypersonic Flow Control

Effects of Micro-Ramps on a Shock Wave/Turbulent Boundary Layer Interaction

Suppression of Low-Frequency Shock Oscillations over Boundary Layers by Repetitive Laser Pulse Energy Deposition

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