Influences of micro ramp vortex generators on the performance of flush waterjet propulsor [PDF]
Scientific ReportsAn array of micro-ramp vortex generators (MRVGs) is deployed on the bottom of the ship’s hull just before the inlet, aiming to mitigate flow separation on the ramp wall at low inlet velocity ratios (IVR).
Liu Chen, Xiangqian Ma, Ren Dai
doaj +6 more sources
LES investigation into the generation of momentum deficits in the supersonic wake of a micro-ramp [PDF]
Journal of Mechanical Science and Technology, 2014 Implicitly implemented large eddy simulation (LES) with a fifth-order WENO scheme was conducted in this study. Based on Navier-Stokes equations, this LES was carried out to explore the origin of momentum deficit caused by a supersonic micro-ramp at flow ...
Zhengzhong Sun, Chaoqun Liu
exaly +6 more sources
Embedded large eddy simulation of boundary layer transition behind a micro-ramp
Engineering Applications of Computational Fluid MechanicsBoundary layer transition induced by surface roughness elements plays an important role in aerodynamic and aero-thermodynamic design of subsonic/supersonic/hypersonic vehicles.
Yujing Lin, Jian Wang, Andy Augousti
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Micro-Ramps for Hypersonic Flow Control [PDF]
Micromachines, 2012 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 ...
Konstantinos Kontis +3 more
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Decay of the supersonic turbulent wakes from micro-ramps [PDF]
Physics of Fluids, 2014 The wakes resulting from micro-ramps immersed in a supersonic turbulent boundary layer at Ma = 2.0 are investigated by means of particle image velocimetry.
B. W. van Oudheusden +4 more
core +4 more sources
Transitional Flow Dynamics Behind a Micro-Ramp [PDF]
Flow, Turbulence and Combustion, 2019 AbstractMicro-ramps are popular passive flow control devices which can delay flow separation by re-energising the lower portion of the boundary layer. We compute the laminar base flow, the instantaneous transitional flow, and the mean flow around a micro-ramp immersed in a quasi-incompressible boundary layer at supercritical roughness Reynolds number ...
Stefan Hickel
exaly +5 more sources
The Vortical Structures in the Rear Separation and Wake Produced by a Supersonic Micro-Ramp [PDF]
51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 2014 The vortical structures in the rear separation and wake region produced by a micro-ramp that immersed in a supersonic turbulent boundary layer are investigated.
Chaoqun Liu +6 more
core +4 more sources
A Cooperative Merging Method for Mixed Traffic Based on Enhanced Graph Reinforcement Learning with Vehicle Collaboration Graphs [PDF]
SensorsAchieving cooperative perception and decision-making among connected and autonomous vehicles (CAVs) in mixed-traffic ramp merge scenarios is crucial for building a swarm intelligence-based traffic control system.
Haifeng Guo +5 more
doaj +2 more sources
Intensity Modulation Effects on Ultrafast Laser Ablation Efficiency and Defect Formation in Fused Silica [PDF]
NanomaterialsUltrafast laser processing is a critical technology for micro- and nano-fabrication due to its ability to minimize heat-affected zones. The effects of intensity variation on the ultrafast laser ablation of fused silica were investigated to gain ...
Dai Yoshitomi +5 more
doaj +2 more sources
PIV investigation of the 3D instantaneous flow organization behind a micro-ramp in a supersonic boundary layer [PDF]
, 2012 The flow field resulting from a single micro-ramp in a Ma=2.0 supersonic boundary layer is investigated using tomographic particle image velocimetry (Tomo-PIV). The measurements were carried out within two volumes behind the micro-ramp.
D. Ragni +4 more
core +4 more sources