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The non-standard dynamics characteristics of hypersonic vehicles, the aerodynamic effects together with the wide range of speed and altitude during operation make modeling and control of these vehicles highly challenging. Modeling and analysis of hypersonic vehicles are important for control and navigation system design. A six degrees of freedom simulation model of the wing cone generic hypersonic...
This paper presents the wind turbine emulator using the wind turbine model based on blade element momentum theory. The lift coefficient cl and drag coefficient cd of designed blade shape are calculated with the fluid analysis. Therefore the proposed wind turbine emulator can emulate the new designed windmill without manufacturing. Also the wind turbine model considers the mechanical model and the...
The two-dimensional incompressible Navier-Stokes equations and the SST k-?? turbulence model are used to investigate the aerodynamic performance of a wind turbine airfoil under clean and rough surface conditions. The DU 95-W-180 airfoil is analysized, which is widely used in wind turbines. The numerical simulation of the airfoil under clean surface condition is performed, and the numerical results...
This work aims to study a two-dimensional incompressible flow around a cylinder in forced movement in order to understand the phenomena that occur in cylindrical structures under periodic oscillation using the Direct Numerical Simulation technique. The simulations were taken using the computational code named Incompact3d. It was used the Reynolds Number as 400 in all simulations. The trajectories...
The laminar-to-turbulent transition is one of the most complex but important flows. In order to deeply apprehend the wind turbine airfoil flow characteristics and the transition phenomenon, a two-equation transition model is applied in this article to simulate the flow over a wind turbine S814 airfoil. Typical angle of attack and both steady and unsteady transition models are tried. The predictions...
Reynolds number has a direct impact on the performance of a wind turbine aerofoil. In this paper, the airfoil NREL S809 was chosen for the research, using numerical simulation and experiment for the performance of the two-dimensional aerodynamic airfoil flow. While Reynolds number varies from 1.5times104 to 2times105, both the drag coefficient and the lift coefficient have great changes. However,...
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