非对称频率对双扑翼采集特性影响的仿真研究

Simulation Investigation on the Effect of Asymmetric Frequency on Extraction Characteristics of Dual Foils

本文针对非对称振型提升扑翼采集性能的可行性,构建适用于双扑翼非对称振荡过程的控制及仿真程序,通过数值方法探究双扑翼在多种非对称频率振型下能量采集效果的变化规律,揭示不同非对称参数时翼型附近流场结构的演变机理。研究表明,双扑翼功率系数和采集效率均随非对称参数的增大而先增大后减小,最大平均功率系数为0.714,出现在非对称参数为0.45的振型下,相比对称振型时增大约1.98%,可达到提升双扑翼采集效果的目的。

Aiming at the feasibility of improving foil extraction characteristic with the asymmetric mode,the control and simulation program for the asymmetric oscillation of dual foils is established.The rules of energy extraction performance of dual foils with various asymmetric frequency modes is discussed numerically.The evolution mechanism of the flow field structure near foils at different asymmetric parameters is obtained.Results show that the power coefficient and extraction efficiency of dual foils increase firstly and then decrease with the increasing asymmetric parameter.The maximal average power coefficient is 0.714,which appears at the oscillation mode with asymmetric parameter 0.45.Comparing with the symmetric mode,it increases by 1.98%,which can improve the extraction characteristics of dual foils.