不同出口型与驱动频率的活塞型自耦合射流研究
Experimental investigation of the characteristics of synthetic jet with different orifice aspect ratio and frequency
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摘要: 采用PIV对驱动频率为10, 20, 30 Hz的活塞式自耦合射流作动器流场进行测量, 应用相位锁定技术, 测得了一个周期内72个相位的瞬时流场.对3种频率下的自耦合射流的变化规律的分析, 发现当前实验条件下, 在几何尺寸不变时, 随着频率的增加, 冲程长度L0与平均出口速度U0迅速上升;当频率不变时, 随着出口孔长宽比AR的增加, 冲程长度L0于平均出口速度U0呈下降趋势;而随着孔板厚度d的增加, 冲程长度L0却随之下降.通过5个周期360张瞬时流场图的平均得到了自耦合射流的时均流场, 数据分析表明, 自耦合射流方向性很好, 其沿流方向速度剖面具有自模化特征.相对于定常二维平面射流, 其稳定发展段中心线上沿流向方向速度衰减较快.Abstract: By means of experimental investigation of the unsteady flow near the orifice of synthetic jet actuator using PIV technology and using the phase-locked sample technique,72 instantaneous images and quantitative measurements during one actuating cycle for three different frequencies 10,20,30 Hz are obtained.The PIV measurements rdisplay the properties and structures of the unsteady flow field.Detailed study shows that in the current experiment,with fixed orifice scale and increasing frequency,the corresponding average orifice velocity U0 and stroke length L0 increase.While with constant driving frequency and increasing aspect ratio,both average orifice velocity U0 and stroke length L0 decrease.Also with increasing thickness of the orifice plate d,the friction in the orifice channel increases,consequently the average orifice velocity U0 and stroke length L0 decreases.Time-averaged flow field obtained by 350 image pairs overlapped shows the similarity of dimensionless cross-stream velocity profile and the centerline velocity decay ratio of synthetic jet in the fully developed segment is higher than the conventional 2D free jet.
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Key words:
- aerospace propulsion system /
- synthetic jet /
- PIV technique /
- phase-locked
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[1] Amitay M,Smith B L,Glezer A.Aerodynamic flow control using synthetic jet technology[R].AIAA 98-0208. [2] Kral L D.Active flow control technology[R].ASME Paper No.FEDSM 2001-18196. [3] Smith B L,Glezer A.The formation and evolution of synthetic jets[J].Physics of Fluids,1998,10(9):2281-2297. [4] Smith B L,Glezer A.Jet vectoring using synthetic jets[J].J.Fluid Mech,2002,458:1-34. [5] Smith B L,Glezer A.Vectoring and small-scale motions effects in free shear flows using synthetic jet actuators[R].AIAA 1997-0213. [6] YAO Chungsheng,Chen F J,Neuhart D.Synthetic jet flow field database for CFD validation[R].AIAA 2004-2218. [7] 罗小兵,李志信,过增元.合成喷形成的机理分析[J].清华大学学报,2000,40(12):86-89.LUO Xiaobing,LI Zhixin,GUO Zengyue.Analysis of the mechanism of synthetic jet formation[J].Journal of Tsinghua University (Science and Technology),2000,40(12):86-89. [8] 高峰,汪亮,杜新.微射流作动器外流场数值模拟[J].西北工业大学学报,2003,21(2):244-247.GAO Feng,WANG Liang,DU Xing.Numerical simulation of synthetic jet flow[J].Journal of Northwestern Polytechnical University,2003,21(2):244-247. [9] 罗振兵,夏智勋,胡建新,等.合成射流流场数值模拟及激励器参数分析[J].推进技术,2004,25(3):199-205.LUO Zhengbing,XIA Zhixun,HU Jianxin,et al.Numerical simulation of synthetic jet flow field and parameter analysis of actiuator[J].Journal of Propulsion Technolohy,2004,25(3):199-205. [10] 罗振兵,朱伯鹏,夏智勋,等.合成射流激励器对射流矢量的影响[J].推进技术,2004,25(5)405-410.LUO Zhengbing,ZHU Bopeng,XIA Zhixun,et al.Jet vectoring using synthetic jet actuators[J].Journal of Propulsion Technology,2004,25(5):405-410. [11] 顾蕴松,明晓.应用PIV技术研究"零质量"射流的非定常流场特性[J].实验流体力学,2005,19(1):83-86.GU Yunsong,MING Xiao.Investigation on the characteristics and structures of unsteady flow field near the zero-mass flux jet with PIV[J].Journal of Experiments in Fluid,Mechanics,2005,19(1):83-86. [12] 李念,张堃元,徐惊雷.自耦合射流对平主行主射流的矢量偏转实验研究[J].推进技术2005,26(3):248-251.LI Nian,ZHANG Kunyuan,XU Jinglei.Experimental investigation of primary flowvectoring using parallel synthetic jets[J].Journal of Propulsion Technology,2005,26(3):248-251. [13] Gilarranz J L,Traub L W,Rediniotis O K.Characterization of a compact,high-power synthetic jet actuator for flow separation control[R].AIAA 2002-0127. [14] ZHONG Shan,Garcillan L,Wood Z P N J.A PIV study of synthetic jets with different orifice shape and orientation[R].AIAA 2004-2213.
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