航空学报 > 2007, Vol. 28 Issue (1): 20-24

应用PIV技术测量压电型自耦合射流

李念,张堃元,沙江   

  1. 南京航空航天大学 能源与动力学院
  • 收稿日期:2005-07-29 修回日期:2006-07-05 出版日期:2007-01-10 发布日期:2007-01-10
  • 通讯作者: 张堃元

Experiments on the Characteristics and Structure of Unsteady Flow Field of Synthetic Jet

LI Nian,ZHANG Kunyuan,SHA Jiang   

  1. College of Energy and Power, Nanjing University of Aeronautics and Astronautics
  • Received:2005-07-29 Revised:2006-07-05 Online:2007-01-10 Published:2007-01-10
  • Contact: ZHANG Kunyuan

摘要:

采用PIV对激励信号频率为300 Hz、 400 Hz和500 Hz的矩型出口自耦合射流流场进行测量,应用相位锁定技术,测得一个激励周期内12个相位的瞬时流场,并由120张瞬时流场图像的平均得到了射流流场时均流动特性。分析了3种频率下的流场结构,发现在当前实验条件下,射流的扩张半角近35°,稳定增长区的中心线速度随流向距离的-0.511次方变化。当频率为f=400 Hz时流量增长率高达4,动量增长率最高达4.5。当沿流向距离y/h>40后自耦合射流的动量呈下降趋势,这与定常二维平面射流动量保持不变的规律不同。

关键词: PIV粒子图像测速仪, 自耦合射流, 涡对, 非定常流动

Abstract:

Experimental investigation on the unsteady flow near the slot of synthetic jet actuator using PIV technology,and with the phaselocked sample technique instantaneous images and quantitative measurements results during one actuating cycle for three different frequencies 300 Hz,400 Hz and 500 Hz is presented,and ensembleaveraging of 120 image pairs as well.The PIV measurement results indicate the properties and structures of the unsteady flow field.

Key words: PIV , technique,  , synthetic , jet,  , vortex , pair,  , unsteady , flow

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