Effects of trailing-edge flaps on the power-extraction performance of flapping airfoils

ZHOU Daming; SUN Xiaojing

doi:10.7638/kqdlxxb-2020.0083

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Effects of trailing-edge flaps on the power-extraction performance of flapping airfoils

更新时间：2026-05-28

- Effects of trailing-edge flaps on the power-extraction performance of flapping airfoils
- Vol. 39, Issue 5, Pages: 7-18(2021)
- 作者机构：
  
  上海理工大学能源与动力工程学院,上海,200093
- 作者简介：
- 基金信息：
- DOI：10.7638/kqdlxxb-2020.0083
  CLC： V276
- Published：2021
- 稿件说明：
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周大明, 孙晓晶. 尾缘襟翼对扑翼的获能特性影响[J]. 空气动力学学报, 2021, 39(5): 7−18.

ZHOU Daming, SUN Xiaojing. Effects of trailing-edge flaps on the power-extraction performance of flapping airfoils[J]. 2021, 39(5): 7-18.
周大明, 孙晓晶. 尾缘襟翼对扑翼的获能特性影响[J]. 空气动力学学报, 2021, 39(5): 7−18. DOI： 10.7638/kqdlxxb-2020.0083

ZHOU Daming, SUN Xiaojing. Effects of trailing-edge flaps on the power-extraction performance of flapping airfoils[J]. 2021, 39(5): 7-18. DOI： 10.7638/kqdlxxb-2020.0083.

摘要

扑翼获能器是一种模仿飞鸟振翅扑动的新型获能装置。为提高扑翼的获能效率，建立了一种带有尾缘襟翼的扑翼模型，且该种襟翼在扑翼运行过程中始终向翼型压力面偏转，利用计算流体力学方法求解了二维不可压缩非稳态Navier-Stokes方程。在雷诺数

= 4.7×10

的工况下，分析了尾缘襟翼对扑翼流场的作用机理，并与原始翼型扑翼进行了对比。同时，还研究了翼型厚度对具有尾缘襟翼扑翼获能的影响。结果表明：扑翼升沉力做功占其获能的主要部分，应用尾缘襟翼后，扑翼的升沉力在整个扑动周期内都得到了提高，并且升沉力与升沉速度的协同性获得改善；尾缘襟翼对扑翼获能效率的提高作用在高频率下效果最为明显，最多可以得到23.5%的相对提升；此外，翼型厚度影响着扑翼前缘涡的演化，翼型厚度增加，前缘涡的生成受到抑制，扑翼获能效率则随翼型厚度增大呈先增加后降低的规律，因此存在最佳翼型。

Abstract

The flapping airfoil is a new type of energy harvester inspired by the flapping motion of birds. This paper aims to explore the potential of power-extraction enhancement of a flapping airfoil by using an oscillating trailing-edge flap

which invariably deflects towards the pressure side of the airfoil during the flapping cycle. Two-dimensional unsteady Reynolds-averaged Navier-Stokes (URANS) simulations at a Reynolds number

= 4.7×10

are conducted to compare the power-extraction performance of the proposed model with that of a plain flapping airfoil. In addition

the effect of airfoil thickn

ess on the power-extraction efficiency is also analyzed. The results show that the heaving force

which can be increased during the entire flapping cycle by the use of trailing-edge flap

is the dominant contributor to the total power output of a flapping airfoil. It is also found that a better synchronization between the heaving motion and heaving force can be achieved by the use of a flap

yielding a greater power-extraction efficiency. The trailing-edge flap is proved to be beneficial to the power generation

especially at higher frequencies. The maximum power-extraction efficiency of the flapping airfoil with a trailing-edge flap can be increased by approximately 23.5% compared to the plain airfoil. Moreover

the leading-edge vortex will be suppressed by thicker airfoils

and there is an optimal airfoil thickness for the power extraction.

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references

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