An aerodynamic analysis of a novel small wind turbine based on impulse turbine principles

This document is the Accepted Manuscript of the following article: Pei Ying, Yong Kang Chen, and Yi Geng Xu, ‘An aerodynamic analysis of a novel small wind turbine based on impulse turbine principles’, Renewable Energy, Vol. 75: 37-43, March 2015, DOI: https://doi.org/10.1016/j.renene.2014.09.035, made available under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License CC BY NC-ND 4.0 http://creativecommons.org/licenses/by-nc-nd/4.0/The paper presents both a numerical and an experimental approach to study the air flow characteristics of a novel small wind turbine and to predict its performance. The turbine model was generated based on impulse turbine principles in order to be employed in an omni-flow wind energy system in urban areas. The results have shown that the maximum flow velocity behind the stator can be increased by 20% because of a nozzle cascade from the stator geometry. It was also observed that a wind turbine with a 0.3 m rotor diameter achieved the maximum power coefficient of 0.17 at the tip speed ratio of 0.6 under the wind velocity of 8.2 m/s. It was also found that the power coefficient was linked to the hub-to-tip ratio and reached its maximum value when the hub-to-tip ratio was 0.45. It is evident that this new wind turbine has the potential for low working noise and good starting feature compared with a conventional horizontal axis wind turbine.Peer reviewedFinal Accepted Versio

Corporate Social Responsibility and Likelihood of Financial Distress

Does doing good to society make firms less likely to have financial trouble? This paper looks at the benefit of corporate social responsibility (CSR) and examines whether firms’ CSR engagement affects their chance of falling into financial distress. After analyzing a broad U.S. database spanning 25 years from 1991 to 2015, we find that CSR engagement indeed reduces the likelihood of firms falling into financial distress, and the results are statistically robust and economically significant. Further, we find the impact of CSR on the likelihood of financial distress is more pronounced in economic downturns and for firms with high levels of international involvement. Collectively, our result suggests that CSR lowers financial distress risks by improving firmstakeholder relationships, which enhances our understanding of the stakeholder view of CSR with longitudinal approach and contextual consideration of firms