ORCID Profile
0000-0002-3607-7195
Current Organisation
University of South Australia
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: Elsevier BV
Date: 04-2016
Publisher: Elsevier BV
Date: 04-2015
Publisher: Elsevier BV
Date: 06-2010
Publisher: SAGE Publications
Date: 06-1996
DOI: 10.1243/PIME_PROC_1996_210_034_02
Abstract: Improvements in technology have reduced the unit cost of wind–electric power systems by almost an order of magnitude since 1981, and installed wind power capacity is growing rapidly world-wide. Paradoxically, the use of wind-powered pumping systems, formerly the major application of wind power, is declining and little progress has been made towards the direct application of wind power to drive other mechanical loads such as aerators and compressors for heat pumps, despite huge potential markets in areas remote from electricity grids. A major reason for this failure to apply improved wind turbine technology to non-electrical loads is low system efficiency resulting from poor torque matching between the wind turbine rotor and the load. Methods of improving system efficiency are reviewed, including load-disengaging devices to permit easy starting and a simple mechanical control system for a variable ratio drive which would ensure that any wind turbine driving any load will operate near peak efficiency over the full operating range from cut-in to governing. The latter system could improve average system efficiency by a factor of 3 to 8 and has the further advantage that it can provide starting torque and can actuate overspeed control for Darrieus vertical axis wind turbines and low-solidity horizontal axis wind turbines.
Publisher: Elsevier BV
Date: 03-2011
Publisher: Elsevier BV
Date: 09-2011
Publisher: American Society of Civil Engineers (ASCE)
Date: 10-1995
Publisher: SAGE Publications
Date: 15-11-2017
Abstract: The performance of a 5-m diameter Darrieus vertical axis wind turbine was predicted using both a double multiple streamtube model and a two-dimensional unsteady Reynolds-averaged Navier–Stokes computational fluid dynamics simulation with constant rotational speed for a series of operational points. The actual performance was measured in both fixed and variable pitch modes. The aims were (1) to compare starting torque and peak efficiency in fixed and variable pitch modes and (2) to test an overspeed control mechanism. Starting torque was approximately three times higher in variable pitch mode and the maximum efficiency on some runs was significantly higher. The overspeed control mechanism functioned consistently as designed. Thus, variable pitch was shown to overcome two major disadvantages of normal fixed pitch vertical axis wind turbines, self-starting and overspeed control. Discrepancies between the predicted and measured results showed the importance of accurately assessing parasitic drag losses and the need for three-dimensional simulation to give reliable performance predictions.
Publisher: Elsevier BV
Date: 11-2011
Publisher: Elsevier BV
Date: 09-2012
Publisher: Elsevier BV
Date: 07-2010
No related grants have been discovered for brian kirke.