Vectoring and small-scale motions effected in free shear flows using synthetic jet actuators
Vectoring and small-scale motions effected in free shear flows using synthetic jet actuators
复制标题
DOI：
10.2514/6.1997-213
复制
发表时间：
1997-01
期刊：
影响因子：
--
通讯作者：
Barton L Smith;A. Glezer
中科院分区：
文献类型：
--
作者：
Barton L Smith;A. Glezer
基于合成射流技术的新型射流执行器被用于实现常规空气射流中的推力矢量和操纵小范围运动。合成射流在没有净质量注入的情况下运行(因此完全由夹带流体组成)，具有有限的流向动量，并由尖孔边缘的一系列二维涡的时间调和形成而成。在本实验中，毫米级大展弦比激励器射流被放置在原始矩形射流的长边和出口平面附近，按比例放大一到两个数量级。主射流可以以超过30度的角度朝向或远离致动器射流(如果成对的致动器射流协同操作，则超过80度)。激励频率至少比主喷流的不稳定频率高一个数量级，从而导致小尺度运动的直接激励和增强的湍流耗散。(作者)
Novel fluidic actuators based on synthetic jet technology are used to effect thrust vectoring and manipulate small-scale motions in conventional air jets. Synthetic jets operate without net mass injection (and thus are comprised entirely of entrained fluid), have finite streamwise momentum, and are synthesized by the time-harmonic formation of a train of two-dimensional vortices at the edge of a sharp orifice. In the present experiments, millimeter-scale high aspect ratio actuator jets are placed along the long sides and near the exit plane of a primary rectangular jet scaling one to two orders of magnitude larger. The primary jet can be vectored either towards or away from the actuator jets at angles exceeding 30 deg (and 80 deg when pairs of actuator jets are operated in concert). The actuation frequency is at least an order of magnitude higher than the unstable frequency of the primary jet and thus results in direct excitation of small scale motions and enhanced turbulent dissipation. (Author)