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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...
The effect of rotor blade installation angle on the flow field and performance of axial flow fan is presented in this paper. CFD simulation and experimental investigations are carried out with different value of installation angle. First, the inner flow fields of axial fan were simulated and analyzed by using the RNG k-? turbulent model and sliding mesh method of Fluent 6.3 software. Then, a five-hole...
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...
Based on CFD technology, the three-dimension transient numerical simulation of single-phase turbulence flow in the hydraulic retarder was performed by sliding mesh theory with using the standard k-?? turbulence model and the SIMPLEC algorithm simutaneously. Through the numerical calculation, the internal characteristics of velocity and pressure distribution were analyzed The braking torque was also...
Based on the one-dimensional design method and under the condition of ideal gas, this paper analyses the proportion of swirl energy losses to the theoretical pressure rise of the axial-flow fans used in the China-made 300 MW Generator and WESTHOUSE 135 MW Generator, the former is 13.79% and the latter is 11.4%. The results both of the CFD numerical simulation and model-testing prove that the straightener...
Conventional Savonius rotor is a ldquoS-shapedrdquo cross-section rotor, the power performance coefficient (CP=0.15) is rather low. This study introduces a new type-helical Savonius rotor, applies calculation fluid dynamics (CFD) to analyze and improve the performance of the rotor from aspects ratio(H/D), number of blades, overlap distance and helical angle(thetas). The results show the performance...
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