A5011870555- Fluid Dynamics and Turbulent Flows
- Aerodynamics and Fluid Dynamics Research
- Plasma and Flow Control in Aerodynamics
- Aerodynamics and Acoustics in Jet Flows
- Fluid Dynamics and Vibration Analysis
- Wind and Air Flow Studies
- Optical measurement and interference techniques
- Industrial Vision Systems and Defect Detection
- Robotics and Sensor-Based Localization
- Image and Object Detection Techniques
- Computational Fluid Dynamics and Aerodynamics
- Thermography and Photoacoustic Techniques
- Space Satellite Systems and Control
- Infrared Target Detection Methodologies
- Advanced Vision and Imaging
- Advanced Measurement and Detection Methods
- Heat Transfer Mechanisms
- Aerospace Engineering and Energy Systems
- Soft Robotics and Applications
- Advanced Aircraft Design and Technologies
Beihang University
2004-2025
The effect of a novel plasma Gurney flap on the aerodynamic characteristics NACA 0012 airfoil is studied by solving Reynolds-averaged Navier–Stokes equations. actuator simulatedwith phenomenological model. results indicate that can increase lift and nose-down pitching moment airfoil, mechanism same as conventional flap. flowfield presents vonKarman vortex street disappears near trailing edge with plasmaGurney flap, which decreases airfoil’s drag thus increases lift-to-drag ratio before...
A novel signal wave pattern is proposed to generate a more efficient synthetic jet, and the unsteady mean flow characteristics of jet generated by different suction duty cycle factors k are examined numerical simulation. The flowfields with have similar features that exhibited in previous experiments, but they would stronger larger scale vortex pair factor k, when two key parameters, stroke length ratio L 0 /D Reynolds number Re U0 (based on characteristic blowing velocity U orifice D), set...
A ERODYNAMIC flow control based on plasma actuators is now in expansion, because are fully electronic with nomoving parts; they have an extremely fast response, very low mass, input power, and the easy ability to simulate their effect numerical solvers [1]. In particular, areflexible, so that can be formed various shapes located air vehicles relative ease. There no other known such flexibility [2]. many different actuators, including dielectric barrier discharge (DBD), direct current glow...
A two-dimensional steady Reynolds-averaged Navier–Stokes equation was solved to investigate the effects of a Gurney flap on RAE-2822 (Royal Aeronautical Establishment) supercritical airfoil aerodynamic performance. The heights ofGurneyflaps range from0.25 3%airfoil chord lengths. incompressible/compressibleNavier–Stokes equations were used simulate flow structure around airfoils in subsonic/transonic flows, respectively, with Spalart–Allmaras turbulence model. In comparison clean airfoil,...
A novel plasma circulation control technique is proposed to overcome the disadvantage of conventional jet about requirement for air source. By employing actuator on trailing edge airfoil, plasma-induced wall tangential airfoil surface and served as Coanda blowing jet, which makes trailing-edge detachment point migrate lower airfoil. In this way, lift are directly controlled by actuator. The effectiveness aerodynamic characteristics improvement NCCR 1510-7067N demonstrated solving...
The instability and spanwise reproduction process of one single low-speed streak evolved in a laminar flat-plate boundary layer is experimentally investigated. primary goal this experiment to bridge the gap between understandings on characteristics dynamic mechanisms free stream turbulence-induced bypass transition. wake an upstream wall-normal positioned interference wire used generate through leading edge receptivity process. Moreover, introduces irregular perturbations with...
The flowfield induced by a plasma synthetic jet actuator was investigated solving Reynolds-averaged Navier- Stokes equations, augmented with phenomenological model representing the plasma-induced body force imparted on fluid. Flow characteristics of an unsteady in quiescent air were presented. results indicate that time-averaged is quite similar to steady jet, traditional blowing and plane jet. streamwise velocity little smaller than case, but half-width much larger. This makes volume...
With the rapid development of space science projects, large deployable mechanisms have been widely used. However, due to effects mechanical friction and gravitational acceleration, on-orbit cannot be always deployed expected pose. For some precision optical mechanisms, even a minor deviation can result in significant error, so it needs measured corrected. In this paper, deployment process was modeled simplified as rotation under single-rotation-axis constraint translation single-direction...
Abstract Defect detection of inner surface precision pipes is a crucial aspect ensuring production safety. Currently, pipeline defect primarily relies on recording video for manual recognition, with urgent need to improve automation, quantification and accuracy. This paper presents hexapod in-pipe robot carrying capacity designed transport the omnidirectional vision sensor specified location within unreachable pipelines. The feasibility robot’s mechanical design load-carrying module analyzed...
Abstract The effects on the wall pressure of plate caused by introduction a gap near ground and flaps were investigated experimentally. mean surface was found to decrease with size changing when ( g ) is larger than flap height h ), but one in recirculation region increase about 0 ≤ 2h . Three kinds flow structure appear increasing sizes, transit point at g/h = 0·2, 0·8 respectively. For zigzag d/h 0·19, d zigzag), variation similar flat general. affects x/h 20 (the zone) can fluctuating...