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The proposed twin turbine system consists of a Wells turbine with guide vanes and an impulse turbine for energy conversion from the oscillating airflow. It was hypothesized that by coupling these axial flow turbines together, the pneumatic energy from oscillating airflow was captured by the Wells turbine as main turbine at low flow rate and by the impulse turbine as booster turbine at high flow rate...
Wells turbine has long been used as an energy converter for wave energy conversion because of its simple structure. In order to alleviate the stall problem of this turbine, the authors have proposed a Wells turbine with booster for wave energy conversion. This unique power take-off consists of the Wells turbine for main turbine and a impulse turbine for booster. In the present, the wind-tunnel tests...
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...
In-stream hydrokinetic turbines, devices that generate electrical power from moving currents without the use of dams, have the potential to significantly impact the electrical power portfolio of many countries. This work focuses on improving the power production of in-stream hydrokinetic turbines by implementing an adaptive controller that regulates shaft torque. This controller is evaluated using...
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...
Oscillating water column wave energy converter is widely used in the world. The impulse turbine is recently employed for the bi-directional mechanical air power into electricity power. The 2D and 3D numerical model is established in the present paper to investigation the operating performance. The proper mesh style, turbulence model and numerical solutions are employed to study the velocity and air...
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...
The rotating stall of turbo machinery causes the bottleneck in the air compressor performance further improving. Based on the numerical simulation research of the transonic compressor rotor, the flow field details which cannot get from experiments were derived, and the physical mechanism of the first stall at blade tip in transonic compressor was qualitatively interpreted, then it was found that the...
In response to Florida's growing energy needs and drive to develop renewable power, Florida Atlantic University's Center for Ocean Energy Technology (COET) plans to deploy a mooring near the core of the Gulf Stream off southeast Florida's coast. This mooring system testing platform will be used to evaluate the performance of prototype ocean current turbines including COET's 20 kW turbine that is currently...
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...
The casing treatments have the potential to extent the operating range of centrifugal compressor. To research performance verify of the high speed centrifugal compressor between the different conditions with the different casing treatments and with untreated smooth wall. The time accurate 3-dimentional numerical simulations are performed in a high speed centrifugal compressor with the different casing...
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"...
The tubular pump device model including rotor, stator and inlet and outlet passages was simulated based on SIMPLEC arithmetic and standard k-?? RNG turbulence model. The match of rotor and stator in tubular pump was optimized. The numerical results show that the device model has a steady flow field and high efficiency when the distance between rotor and stator is 0.11D2. With the distance increasing...
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...
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...
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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