Micro-Ramps for Hypersonic Flow Control

Saad, Mohd Rashdan; Zare‐Behtash, Hossein; Idris, Azam Che; Kontis, Konstantinos

doi:10.3390/mi3020364

Cited by 50 publications

(28 citation statements)

References 23 publications

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“…These vortices will merge into the primary vortex when they propagate downstream, while the new secondary vortex will be generated under the primary vortex and travel with the speed of sound. This dynamic vortex model is mostly confirmed by the experimental work of Saad et al 20 American Institute of Aeronautics and Astronautics…”

Section: Vortex Visualizationsupporting

confidence: 69%

Numerical Investigation on the Oblique Shock and High-speed Vortex Rings Interaction

Dong

Yang

et al. 2017

55th AIAA Aerospace Sciences Meeting

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A wedge-shaped micro vortex generator is placed on a flat plate over which a turbulent boundary layer at Mach number 2.5 is developed. The interaction between an oblique shock wave and high-speed vortex rings in the MVG controlled ramp flow is investigated by using a high order implicit large eddy simulation with the fifth order bandwidth optimized WENO scheme. The vortical structures are visualized using the Omega identification method proposed by UTA researchers. By tracking several typical vortex rings before, when and after they pass through the shock front, the quantitative changes of flow properties are studied in detail. It shows that the spanwise vorticity takes a leading role in flow propagation, the reflection shock gets distorted when hit by rings and recovers quickly afterwards, and a number of weak shocks exist around the vortex rings due to the shock ring interaction.

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Section: Vortex Visualizationsupporting

confidence: 69%

Numerical Investigation on the Oblique Shock and High-speed Vortex Rings Interaction

Dong

Yang

et al. 2017

55th AIAA Aerospace Sciences Meeting

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“…The primary vortex in the wake center dominates the vortical structures, while several other secondary filaments also co-exist. The secondary vortex originating from the junction of MVG trailing edge and wall has been identified in wind tunnel experiments through surface flow visualization [4,22,24,25]. The visualization image of Lu et al [24] is shown in figure 14, where the traces of secondary vortices vanish till about 5 ramp heights downstream, suggesting its relatively shorter life.…”

Section: The Streamwise Vortexmentioning

confidence: 99%

Micro Vortex Generators for Boundary Layer Control: Principles and Applications

Sun¹

2015

International Journal of Flow Control

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This is the accepted version of the paper.This version of the publication may differ from the final published version. Permanent repository link AbstractA review is given to the major developments in the boundary layer control by means of micro vortex generator (MVG). The appearance of MVG dates back to about three decades from the present review and this class of device rapidly spreads as an efficient and robust boundary layer control strategy for flows with separation in particular. Substantial successful applications of MVG have been achieved in subsonic flows and its application into supersonic flow is under progressive development, which requires the current status and capability of MVG to be reviewed. The fundamental aspects of MVG are first summarized, including its working principle and various geometries. Understanding of the fluid mechanics involved in the wake of a MVG device is of uppermost importance: the timeaveraged and instantaneous wakes are discussed respectively. In the former, effects from the MVG geometry parameters are presented; while in the latter, focus is placed on the phenomenon associated with flow instability inside the wake. MVG's applications in the subsonic regime are discussed, which covers the fundamental flow separation investigations and studies to tackle several practical problems. The ongoing studies in supersonic regime dealing with shock wave boundary layer interaction (SWBLI) induced separation are reviewed later, where the presentation is organized according to different types of SWBLI with emphasis on the interaction region.

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“…A supersonic flow field is dominated by shock waves, and thus their formation and interaction with the boundary layer is an essential aspect of flow control to attain a desirable flow field around the vehicle [1]. A micro vortex generator, or a micro ramp composed of triangular obstacles with a forward-facing compression ramp, has been studied both at supersonic [2] and hypersonic speeds [3] as a flow modification method. It provides a means of controlling boundary layer separation and shock-induced separation by forming an adverse pressure gradient along the surface.…”

Section: Introductionmentioning

confidence: 99%

Plasma-Assisted Control of Supersonic Flow over a Compression Ramp

2019

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This study considers the effect of an electric discharge on the flow structure near a 19.4° compression ramp in Mach-2 supersonic flow. The experiments were conducted in the supersonic wind tunnel SBR-50 at the University of Notre Dame. The stagnation temperature and pressure were varied in a range of 294–600 K and 1–3 bar, respectively, to attain various Reynolds numbers ranging from 5.3 × 105 to 3.4 × 106 based on the distance between the exit of the Mach-2 nozzle and the leading edge of the ramp. Surface pressure measurements, schlieren visualization, discharge voltage and current measurements, and plasma imaging with a high-speed camera were used to evaluate the plasma control authority on the ramp pressure distribution. The plasma being generated in front of the compression ramp shifted the shock position from the ramp corner to the electrode location, forming a flow separation zone ahead of the ramp. It was found that the pressure on the compression surface reduced almost linearly with the plasma power. The ratio of pressure change to flow stagnation pressure was also an increasing function of the ratio of plasma power to enthalpy flux, indicating that the task-related plasma control effectiveness ranged from 17.5 to 25.

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Micro-Ramps for Hypersonic Flow Control

Cited by 50 publications

References 23 publications

Numerical Investigation on the Oblique Shock and High-speed Vortex Rings Interaction

Numerical Investigation on the Oblique Shock and High-speed Vortex Rings Interaction

Micro Vortex Generators for Boundary Layer Control: Principles and Applications

Plasma-Assisted Control of Supersonic Flow over a Compression Ramp

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