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

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.

[1]  Hisanori Abiru,et al.  Study on a Flapping Wing Hydroelectric Power Generation System , 2009 .

[2]  Guy Dumas,et al.  Optimal Tandem Configuration for Oscillating-Foils Hydrokinetic Turbine , 2012 .

[3]  Qing Xiao,et al.  How motion trajectory affects energy extraction performance of a biomimic energy generator with an oscillating foil , 2012 .

[4]  James DeLaurier,et al.  Wingmill: An Oscillating-Wing Windmill , 1981 .

[5]  Xueming Shao,et al.  Effects of non-sinusoidal pitching motion on energy extraction performance of a semi-active flapping foil , 2016 .

[6]  Qiang Zhu,et al.  Modeling the capacity of a novel flow-energy harvester , 2009 .

[7]  T. Kinsey,et al.  Parametric Study of an Oscillating Airfoil in a Power-Extraction Regime , 2008 .

[8]  Qiang Zhu,et al.  A review on flow energy harvesters based on flapping foils , 2014 .

[9]  G. Lauder,et al.  Fish Exploiting Vortices Decrease Muscle Activity , 2003, Science.

[10]  Qiang Zhu,et al.  Mode coupling and flow energy harvesting by a flapping foil , 2009 .

[11]  Max F. Platzer,et al.  Numerical Analysis of an Oscillating-Wing Wind and Hydropower Generator , 2011 .

[12]  C. Shu,et al.  Pitching-motion-activated flapping foil near solid walls for power extraction: A numerical investigation , 2014 .

[13]  Qiang Zhu,et al.  Optimal frequency for flow energy harvesting of a flapping foil , 2011, Journal of Fluid Mechanics.

[14]  T. Y. Wu,et al.  EXTRACTION OF FLOW ENERGY BY A WING OSCILLATING IN WAVES , 1971 .

[15]  Qing Xiao,et al.  A bio-inspired study on tidal energy extraction with flexible flapping wings , 2013, Bioinspiration & biomimetics.

[16]  James A. Liburdy,et al.  Energy harvesting of a heaving and forward pitching wing with a passively actuated trailing edge , 2015 .

[17]  C. Shu,et al.  Fluid Dynamics of Flapping Insect Wing in Ground Effect , 2014 .

[18]  Jian Deng,et al.  Hydrodynamic studies on two traveling wavy foils in tandem arrangement , 2007 .

[19]  Xueguang Meng,et al.  Wing Kinematics, Aerodynamic Forces and Vortex-wake Structures in Fruit-flies in Forward Flight , 2016 .

[20]  Max F. Platzer,et al.  A review of progress and challenges in flapping foil power generation , 2014 .

[21]  Max F. Platzer,et al.  Numerical Computation of Flapping-Wing Propulsion and Power Extraction , 1997 .

[22]  Ji Hwan Park,et al.  Bird-mimetic Wing System of Flapping-wing Micro Air Vehicle with Autonomous Flight Control Capability , 2016 .

[23]  Joseph C. S. Lai,et al.  Improving power-extraction efficiency of a flapping plate: From passive deformation to active control , 2014 .

[24]  Jin Hwan Ko,et al.  Effect of chord flexure on aerodynamic performance of a flapping wing , 2010 .

[25]  Guy Dumas,et al.  Optimal Operating Parameters for an Oscillating Foil Turbine at Reynolds Number 500,000 , 2014 .

[26]  Y. Lian,et al.  Aerodynamic Response of Stationary and Flapping wings in Oscillatory Low Reynolds Number Flows , 2012 .