Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 8 of 8 for “"Actuator Disc"”.
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Use of actuator disc model for modelling axial compressor dynamics
… are used to represent compressor dynamics. The actuator disc model (ADM) is one of these. It gives the possibility to calculate the pressure rise between the areas upstream and downstream of the blading in the compressor as a function of the axial velocity.<br/>The first question addressed in …
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An investigation of the dynamic stalling characteristics of rotating axial-flow compressor blades
… transfer function was then used in a new semi-actuator disc model to predict the dynamic response of the experimental compressor. The basis of the model is a mathematical representation of the flow fields upstream and downstream of a compressor rotor. The compressor rotor is represented in the …
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Experimental Investigation of Wind Loading on a Ducted Wind Turbine
… duct (Donqi Urban Windmills) loaded with an actuator disc with 50% porosity was tested in the wind tunnel. Turbulence was generated using a novel multi-grid approach that utilises two passive grids placed at a fixed distance from each other. Testing was done for four different turbulence …
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Computational Fluid Dynamics (CFD) modelling of renewable energy turbine wake interactions
… The models developed took the form of actuator discs with the solution of incompressible Reynolds-Averaged Navier-Stokes equations with the k-ω SST turbulence models. Simulations were initially conducted of a single turbine in water and air and then two axially aligned turbines to study …
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Extended Momentum Model for Single and Multiple Hydrokinetic Turbines in Subcritical Flows
… proposes equations extending the Free Surface Actuator Disc Theory to yield drag forces and interference factors from a series of two porous discs in open channel flows. The new model includes blockage ratio and Froude number as independent variables, which are inferred in advance to yield a …
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Yawing effects in wind power plants: stochastic wake modeling and control
… In the final part of this thesis, we use actuator disc concepts to demonstrate the utility of infinite-horizon stopping in optimizing the yaw angles of wind turbines for constrained maximum power production.
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THE EFFECTS OF CURRENT BLOCKAGE ON OFFSHORE STRUCTURES
… of current blockage is formulated based on the actuator disc theory and proposed to represent the actual hydrodynamic drag force more accurately after taking into account the current blockage effects. This thesis tests and verifies the adequacy of the analytical model against series of …
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The aerodynamics of Formula One car cooling ducts.
… immediately downstream of the radiator. An actuator-disc type model of the radiator performance is added to one of the in-house CFD codes. This modified code is used to carry out further investigation into the effects of shaping the downstream duct. A study of the use of metal or graphite …