258,494 research outputs found
Select Committee on Wind Turbines final report
No full textThe committee recommends the Commonwealth Government create an Independent Expert Scientific Committee on Industrial Sound responsible for providing research and advice to the Minister for the Environment on the impact on human health of audible noise (including low frequency) and infrasound from wind turbines.
Recommendation 1: final
6.5 The committee recommends that an Independent Expert Scientific Committee on Industrial Sound (IESC) be established by law, through provisions similar to those which provide for the Independent Expert Scientific Committee on Coal Seam Gas and Large Coal Mining Development.
6.6 The provisions establishing the IESC on Industrial Sound should state that the Scientific Committee must conduct \u27independent, multi-disciplinary research into the adverse impacts and risks to individual and community health and wellbeing associated with wind turbine projects and any other industrial projects which emit sound and vibration energy\u27
Determination of wind turbine far wake using actuator disk
No full textThe growth in size of wind turbines over the last years is significant. The rotor diameter becomes somehow comparable to atmospheric boundary layer at the land surface. In this case the assumption of uniform velocity of upcoming wind cannot be valid. The aim of this paper is to create a simplified model of wind turbine rotor which can represent the aerodynamic inter-action of atmospheric boundary layer with a horizontal axis wind turbine. Such model will be also useful for the study of optimal placement of wind turbines in a wind farm when a large number of calculations is needed and when the time required for full CFD calculations be-comes prohibitive. In this study we adopt actuator disk model which takes in account with sufficient precision the influence of blade geometry on wind turbine aerodynamic performance. The proposed actuator disk model is tested in the case of horizontal axis wind turbine using wall-modelled large eddy simulation. The obtained results of aerodynamic performance and wake show the rapidity of calculation and the reliability of proposed approach
Investigation of wind turbine flow and wake
No full textThis paper is dedicated to the investigation and analysis of wind turbine wake. An experimental work is undertaken in wind tunnel on a horizontal axis wind turbine model. The velocity field in the wake is measured using PIV with phase synchronization in order to relate velocity and vortices to the rotating blades. The tip vortices are investigated in successive azimuthal positions of the rotor. A specially developed algorithm based on the circulation maximum detects the positions of the vortex cores and permits to use conditional averaging technique. The analysis of obtained velocity fields enables to determine the vortex core diameter, the swirl velocity distribution and the vortex diffusion as functions of the vortex age. The quality of obtained results permits to use them as reference for the validation of numerical computations
Experimental study of yawed inflow around wind turbine rotor
No full textIn this article, we present an experimental study in a wind tunnel of a three-bladed, Rutland 503 model, horizontal axis yawed wind turbine. Power measurement and an exploration downstream wake of the turbine using particle image velocimetry measurements are performed. The variation of power coefficient as a function of rotational velocity is presented for different yaw angles. The results show a loss of power from the wind turbine when the yaw angle increases. The velocity field of the downstream wake of the rotor is presented in an azimuth plane, which passes through the symmetry axis of the rotor. The instantaneous velocity field is measured and recorded to allow for obtaining the averaged velocity field. The results also show variations in the wake downstream due to decelerating flow caused by the yawed turbine rotor. Analysis of this data shows that the active control of yaw angles could be an advantage to preserve the power from the wind turbine and that details near rotor wake are important for wake theories and topredict the performance of wind turbines as well
Improved cost energy comparison of permanent magnet generators for large offshore wind turbines
No full textThis paper investigates geared and direct-drive permanent magnet generators for a typical offshore wind turbine, providing a detailed comparison of various wind turbine drivetrain configurations in order to minimise the Cost of Energy. The permanent magnet generator topologies considered include a direct-drive machine and single stage, two-stage or three-stage gearbox driven generators. The cost of energy calculations are based on initial capital costs, the costs of manufacture, installation, operations and maintenance, with particular focus on improved calculations of the annual energy yield with better availability estimations and gearbox loss modelling
Modelling and control of a variable-speed switched reluctance generator based wind turbine
No full textThis paper studies the system modelling and control aspects of switched reluctance generator (SRG) based variable speed wind turbines. A control system is implemented to provide proper operation of the SRG as well as power tracking capabilities for varying wind speeds. The control system for the grid side inverter that will allow the SRG to properly generate power to the system is also presented. Studies are presented of both the SRG and inverter control systems capabilities during a balanced three-phase fault. The paper will demonstrate that the SRG based wind turbine presents a feasible variable wind speed solution with good fault response capabilities
University Wind Ensemble, October 20, 1974
No full textRecorded during a live performance at Shaw Theatre, Western Michigan University, Kalamazoo, Michigan, October 20, 1974, program no. 27 of the Department of Music’s 1974-1975 season.University Wind Ensemble, Carl Bjerregaard, conductor ; Trent Kynaston, saxophone (2nd work).Reel 1: Fanfares pour Britannicus / André Jolivet -- (14:26) Concerto for also saxophone and wind orchestra / Ingolf Dahl.Reel 2: Sonatine fur Blaser. Finale: Allegro molto / Richard Strauss -- Three folksongs. (12:26) The ocean burial ; (15:16) The boatsman and the tailor ; (19:42) Lord Randal / Randall Shinn -- (25:00) Circus overture / William Schuman
Reliability of floating foundation concepts for vertical axis wind turbines
No full textOffshore wind turbines are developing at a rapid pace. By far the most common turbine configuration is the HAWT (Horizontal Axis Wind Turbine) and development of these machines is largely centered about drive train and blade issues with some work concerning foundations/ supporting structures. Several teams around the world are developing floating supporting structures for HAWT, mainly for deep water deployment. This paper describes the development of a floating support structure for Vertical Axis Wind Turbines (VAWT) with particular focus on structural/survival risk and reliability. Unlike Oil & Gas floating support structures, wind turbine floaters need to resist significant dynamic wind and machine loading in addition to wave excitation. Coupling of dynamic response modes can be difficult and consideration of these within a reliability framework presents several challenges. The paper describes a simplified procedure for risk assessment so that potential areas of concern can be quickly identified and uses a VAWT to illustrate the methods and reasoning employed
Integrating Real-World Case Studies into Wind Energy Graduate Education
No full textWind power continues to grow rapidly as a fuel source for the electric power industry in the US. Recent data for 2014 show that wind power in Texas alone delivered in excess of 10 percent of the annual electrical energy consumed in the state. With this growth has emerged the need for a professionally educated national workforce to support the industry and sustain future growth. With the original support of the Texas Workforce Commission in 2008, both undergraduate and graduate wind energy education programs have been established at Texas Tech University. A series of multidisciplinary courses have been developed by the six full-time faculty to support the degree and certificate programs. Total wind energy student course enrollments over approximately 20 wind energy courses offered each semester are averaging 400 to 500. The offerings are both face to face (in-class) and by distance delivery. Starting in Fall 2014 TTU partnered with DNV GL to offer real-world case studies as part of the graduate course offerings. Four case studies were offered in each of two graduate classes - Advanced Technical Wind Energy I and Advanced Managerial Wind Energy I. The case studies covered technical, environmental, and site management topics for a single turbine project, a multi-turbine power plant, an offshore installation, and wind turbine technology innovations. The case studies were delivered remotely allowing students to benefit from real-life examples and the interaction with members of the wind industry. This presentation will discuss an outline of the cases, best practices for integrating industry participation to maximize student benefit, and effective delivery methods - what worked well and what can be improved.Session 4A - Workforce Development and EducationPresents a review using real-life case studies in graduate wind energy classes
Performance of P-P and P-U intensity probes using Scan & Paint
No full textThis paper aims to clarify the principal advantages and disadvantages of using sound intensity probes which implement different measurement principles: p-p probes versus p-u probes or Microflowns. A novel measurement technique based on scanning principles called “Scan & Paint” had been chosen to evaluate their performanc
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