Power Extraction Performance of a Semi-activated Flapping Foil in Gusty Flow

作     者：Jiapu Zhan Bing Xu Jie Wu Jing Wu 

作者机构：Department of A erodynamics Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Jiangsu Key Laboratory of Hi- Tech Research for Wind Turbine Design Nanjing 210016 China 

出 版 物：《Journal of Bionic Engineering》 (仿生工程学报（英文版）)

年 卷 期：2017年第14卷第1期

页      面：99-110页

核心收录：

学科分类：0710[理学-生物学] 07[理学] 09[农学] 

基　　金：support of the Fundamental Research Funds for the Central Universities supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) 

主　　题：semi-activated flapping foil gusty flow power extraction performance 

摘      要：A numerical investigation on the power extraction performance of a semi-activated flapping foil in gusty flow is conducted by using the commercial software FLUENT. The foil is forced to pitch around the axis at one-third chord and heave in the vertical direction due to the period lift force. Different from previous work with uniform flow, an unsteady flow with cosinusoidal velocity profile is considered in this work. At a Reynolds number of 1100, the influences of the mechanical parameters （spring constant and damping coefficient）, the amplitude and frequency of the pitching motion, the amplitude of the gust fluctuation and the phase difference between the pitching motion and the gusty flow on the power extraction performance are systematically investigated. Compared with the case of uniform flow, the capability energy harvesting of the system is enhanced by the introduction of the gusty flow. For a given pitching amplitude and frequency, the power extraction efficiency increases with the gust fluctuation amplitude. Moreover, with an optimal phase difference between pitch and gust （φ = 180°）, the efficiency can be further enhanced due to the generation of high lift force.