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压电驱动自耦合射流流动特性实验
引用本文:谭晓茗,张靖周.压电驱动自耦合射流流动特性实验[J].南京航空航天大学学报(英文版),2007,24(3):199-204.
作者姓名:谭晓茗  张靖周
作者单位:南京航空航天大学能源与动力学院,南京,210016,中国
摘    要:为了研究压电驱动狭缝喷口自耦合射流的流动特性,采用PIV、热线风速仪测试手段,对自耦合射流激发器在不同激励因素下的流场和速度场分布进行了实验和分析.结果显示,自耦合射流在狭缝出口处产生了反向涡对,随着自耦合射流的发展,射流呈现出在喷口短轴方向急剧向两侧扩展、而在喷口长轴方向先收缩后缓慢扩展的流动特征;自耦合射流的速度分布在法线方向呈现先上升后下降的趋势,在z/b=10左右速度达到最大值;在射流展向上,短轴方向速度呈规律的对称分布和速度自模的特征,而长轴方向速度近喷口区域呈现马鞍状分布,随着法向距离增加这种趋势消失.研究中发现,激发器存在两个谐振频率,在谐振频率激发下自耦合射流的速度和涡量比较大.与常规射流相比,自耦合射流显示出了独特的流动特性.

关 键 词:自耦合射流  流动特征  速度分布  粒子测速仪  synthetic  jet  flow  characteristics  velocity  distribution  particle  image  velocimetry  压电驱动  自耦合  射流流动  特性实验  MEMBRANE  PIEZOELECTRIC  DRIVEN  SYNTHETIC  FLOW  CHARACTERISTICS  special  flow  characteristics  continuous  vorticity  works  resonance  frequency  resonance  frequencies  However  velocity  profile  maximum  velocity  distribution
文章编号:1005-1120(2007)03-0199-06
修稿时间:2006-09-07

EXPERIMENT ON FLOW CHARACTERISTICS OF SYNTHETIC JET DRIVEN BY PIEZOELECTRIC MEMBRANE
Tan Xiaoming,Zhang Jingzhou.EXPERIMENT ON FLOW CHARACTERISTICS OF SYNTHETIC JET DRIVEN BY PIEZOELECTRIC MEMBRANE[J].Transactions of Nanjing University of Aeronautics & Astronautics,2007,24(3):199-204.
Authors:Tan Xiaoming  Zhang Jingzhou
Institution:College of Energy and Power Engineering, NUAA, 29 Yudao Street, Nanjing, 210016, P. R. China
Abstract:The characteristics of the flowfields of a synthetic jet actuator are experimentally investigated with the slot-nozzle driven by the piezoelectric membrane. The particle image velocimetry (PIV) and the hot-wire anemometer are utilized to measure the flowfields and the velocity profiles of the actuator with different actuating factors. Analytical results show that pairs of counter-rotating vortices are generated near the nozzle. With the development of the synthetic ject, the synthetic jet rapidly spreads in the slot-width direction; while in the slotlength direction, it contracts firstly and slowly spreads. The centerline velocity distribution has a up-down tendency varying with axial distances, and accelerates to its maximum at z/b= 10. The transverse velocity profile across the slot-width is centro-symmetric and self-similar. However, the velocity profiles across the slot-length are saddle-like near the nozzle. It shows that there are two resonance frequencies for the actuator. If the actuator works with the resonance frequency, the vorticity and the velocity of the synthetic jet are higher than those of other frequencies. Compared with the continuous jet, the synthetic jet shows special flow characteristics.
Keywords:synthetic jet  flow characteristics  velocity distribution  particle image velocimetry
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