Active Control of Axisymmetric Jet with an Array of Micro Electro-Magnetic Flap Actuators.
Active Control of Axisymmetric Jet with an Array of Micro Electro-Magnetic Flap Actuators.
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使用微电磁襟翼执行器阵列主动控制轴对称射流。
DOI：
10.1299/kikaib.65.3644
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
Yuji Suzuki
中科院分区：
文献类型：
--
作者：
Hiroaki Suzuki;N. Kasagi;Yuji Suzuki
研制了一种新型的轴对称射流喷嘴，在其圆形唇缘上配置了一排微型电磁襟翼执行器，用于主动流动控制。根据由PC提供的控制信号独立地驱动通过光刻制造的每个折叠片。通过流动显示和定量速度测量，研究了受控射流的时空流动结构。结果表明，襟翼产生的人为扰动对大尺度涡旋结构的形成和演化有显著的影响。当18个襟翼的每半个襟翼被逐出相位时，由于交替倾斜的涡环之间的相互作用，射流明显地分成两个分支。当射流雷诺数达到13000时，中心线速度降至自然射流中心线速度的45%左右的最佳Strouhal数为0.25。基于二维粒子跟踪测速仪测量的相平均速度场和涡量场，建立了分叉射流的物理模型。
A novel axisymmetric jet nozzle equipped with a row of miniature electromagnetic flap actuators on its circular lip is developed for active flow control. Each of the flaps fabricated by photolithography is independently driven according to a control signal supplied by a PC. The spatio-temporal flow structures of the controlled jet are studied through flow visualization and quantitative velocity measurements. It is found that artificial disturbances generated by the flaps can modify the formation and evolution of large-scale vortical structures significantly. When each half cluster of the 18 flaps are driven out of phase, the jet bifurcates clearly into two branches owing to the interaction between alternatively inclined vortex rings. The optimum Strouhal number, at which the centerline velocity drops to about 45% of that of natural jet, is found to be 0.25 at the jet Reynolds number up to 13 000. A physical model for the bifurcating jet is proposed based on the flow visualization and the phase-averaged velocity and vorticity fields measured by two-dimensional particle tracking velocimetry.