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This paper investigates the limitations of 2D linear unsteady aerofoil theory for modelling the unsteady gust response of tidal stream turbines. The work is motivated by the fact that accurate unsteady load prediction is required to determine turbine life. Current state of the art design codes in industry use a single model, based on Theodorsen's theory, to predict the response to all types of gust...
A numerical simulation has been carried out to investigate the influences of pressure-side winglet on controlling tip clearance flow in an axial compressor cascade. Emphasis is put on the analysis of effectiveness of pressure-side winglet when the approaching flow is at different incidences (-5°, 0°, +3°). The simulation results show that with the increase of incidence, the region under the effect...
Three-dimensional unsteady Reynolds averaged incompressible Navier-Stokes equations are used to simulate the aerodynamic performance of a horizontal axis wind turbine. The numerical method that adopted in this paper is proved to be effective to predict horizontal axis wind turbine aerodynamic characteristics by contrasting the numerical results to the wind turbine experimental data. And the curve...
Present work conducts computer simulations with the Computational Fluid Dynamics (CFD) software package Fluent as a modeling tool to explore aerodynamic characteristics of a newly designed wind turbine for electricity generation. The governing equations consisting of three-dimensional, time-dependent conservation of mass and momentum are solved. The k-ε turbulence model is adopted for the turbulent...
Horizontal axis wind turbine (hereafter HAWT) is the common equipment in wind turbine generator systems in recent years. The paper relates to the numerical simulation of the unsteady airflow around a HAWT of the type Phase VI with emphasis on the power output. The rotor diameter is 10-m and the rotating speed is 72 rpm. The simulation was undertaken with the Computational Fluid Dynamics (CFD) software...
By way of solving a three-dimensional viscous and compressible Reynolds Navier-Stokes equation, a numerical simulation on the three-dimensional turbulent flow was carried out in the gas turbine cascade for turbo-charger set of marine supercharged boiler. The simulation has been accomplished through the adoption of a full three-dimensional numerical simulation technique and "mixing plane"...
Using sliding-mesh to deal with relative mesh movement and guarantee the continuity of physical variables, a coupling model of wind rotor and its surrounding air is established applying shear stress transport (SST) model to the Reynolds equation in fluid zone and the Newmark method to solve the oscillation equations in solid zone in this paper. The effects of fluid-structure interaction are considered...
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