Search

The research addresses the pressing need to understand wind conditions for optimal wind energy utilization, a crucial aspect of achieving global energy sustainability. While previous studies have focused on assessing wind energy potential and terrain roughness, gaps persist in understanding how wind and spatial conditions affect blade geometry. Therefore, this study aims to investigate the impact of local wind conditions on wind turbine blade geometry, integrating nonuniform wind inflow due to wind shear into the theoretical model. Through the paper, it explores blade design for varying inflow conditions and analyses the relationship between terrain type and blade designs. A novel approach to wind turbine blade design, utilizing a theoretical model that combines the local momentum theorem with insights from propeller vortex theory was adopted. Through the analysis, the authors demonstrate that variations in terrain significantly influence blade geometry, underscoring the necessity for tailored turbine designs based on local conditions. The findings reveal discrepancies in blade geometry across different turbine capacities and terrain types, offering novel insights into wind turbine performance optimization. By tailoring blade geometry to specific locations enhances resource utilization, offering insights for energy policymakers. The research provides validated methods for optimizing turbine geometric parameters, opening avenues for increased local investment in wind energy and promoting distributed energy development. Illustrated with wind plants examples, the paper concludes by outlining future research directions in this field. [ABSTRACT FROM AUTHOR]

Road safety is one of the most important global social issues. According to data from the United Nations, every year, around 1.2 million people worldwide die as a result of road accidents; that is, on average, one person dies every 30 seconds. Children and teenagers make up 40% of the fatalities. An additional 30-50 million people are injured as a result of these accidents; some of them become permanently disabled. The main types of accident risks are well documented; they concern a large range of factors, most often related to the behavior of drivers, especially in terms of speed. This article ranks the European Union countries in 2004 and 2018 by their levels of road safety. Four groups of countries are distinguished: very high, moderate, low, and very low levels of road safety. [ABSTRACT FROM AUTHOR]

Copyright of Economic Annals-XXI / Ekonomìčnij Časopis-XXI is the property of Institute of Society Transformation and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)