非正弦振型对沉浮翼型推力产生的影响

吕坤; 谢永慧; 张荻

doi:10.7652/xjtuxb201309009

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非正弦振型对沉浮翼型推力产生的影响

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- 非正弦振型对沉浮翼型推力产生的影响
- Numerical Study of Nonsinusoidal Motion Effect on Plunging Airfoil Propulsion
- 西安交通大学学报 2013年47卷第9期页码：55-59+139
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201309009
  中图分类号： V211.3
- 网络首发：2013-09-10，
  
  纸质出版：2013
- 稿件说明：
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吕坤, 谢永慧, 张荻. 非正弦振型对沉浮翼型推力产生的影响[J]. 西安交通大学学报, 2013,47(9):55-59+139.

Numerical Study of Nonsinusoidal Motion Effect on Plunging Airfoil Propulsion[J]. 2013, 47(9): 55-59+139.
吕坤, 谢永慧, 张荻. 非正弦振型对沉浮翼型推力产生的影响[J]. 西安交通大学学报, 2013,47(9):55-59+139. DOI： 10.7652/xjtuxb201309009.

Numerical Study of Nonsinusoidal Motion Effect on Plunging Airfoil Propulsion[J]. 2013, 47(9): 55-59+139. DOI： 10.7652/xjtuxb201309009.

摘要

对二维沉浮振荡NACA0012翼型周围流场进行了数值模拟

通过改变非正弦参数K实现了不同的非正弦振型

由此分析了非正弦振型对推力产生的影响。结果表明: 非正弦振型主要通过影响瞬时推力系数、最大推力系数和流场结构来影响沉浮翼型推力的产生; 较正弦沉浮振动

K大于0时对应的振型可以增加平均推力系数

在一定沉浮频率和幅度下

平均推力系数随K的增加而增大

推进效率随K的增加而降低; 振型对流场涡结构有明显的影响

随着K增大

翼型尾缘产生更强的反卡门涡街

从而引起推力系数增大

但K增大会使前缘分离更加严重

导致推进效率降低。

Abstract

The effect of nonsinusoidal motion on plunging airfoil aerodynamics for thrust generation was numerically studied with a 2-D NACA0012 airfoil at Re=10

. A nonsinusoidal parameter K was employed to realize various nonsinusoidal motions. The results reveal that nonsinusoidal motion has a noticeable effect on the aerodynamic performance

as it affects the instantaneous force coefficients

maximum thrust coefficients

and flow structures. An increase in K results in better thrust generation performance at a fixed St

especially for K>0. It is also found that the nonsinusoidal motions have notable effect on the wake pattern

and a larger K induces stronger reverse von Karman vortex in the wake

which in turn leads to the thrust generation enhancement. However

the propulsive efficiency decreases with the increasing K because of the larger scale of lead

ing edge separation caused by the larger K.

关键词

Keywords

references

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