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合成双射流(DSJ)激励器由于自身具有独特的矢量控制特性,为合成射流技术应用于主动流动控制提供了新途径。采用了基于射流核心区速度矢量的评价方法,并通过纹影和粒子图像测速法(PIV)流场显示实验研究了非对称出口压电式合成双射流激励器驱动参数(电压和频率)对射流矢量特性的影响。结果表明:合成双射流向出口面积大的一侧偏转,矢量偏转角随电压变化呈现先增大后减小的趋势,存在一个最佳驱动电压幅值,使得矢量偏转角最大;驱动频率变化对矢量偏转角的影响较显著,其对射流矢量的控制机理较复杂,实现矢量偏转角1.53°~36.65°可调,矢量偏转角出现两个峰值,且在振动膜共振频率处,矢量偏转角最小。
Because of its unique vector control characteristic, the synthetic double jet (DSJ) exciter provides a new approach for the application of synthetic jet technology to active flow control. The evaluation method based on the velocity vector in the core of the jet was used. The driving parameters (voltage and frequency) of the asymmetric outlet dual-jet piezoelectric actuator were experimentally studied by the flow field of grain and particle image velocimetry (PIV) Effect of vector character. The results show that the deflection of the composite double jets toward the large area of the exit area tends to increase first and then decrease with the change of voltage. There is an optimal driving voltage amplitude, which maximizes the deflection angle of the vector. The variation of the driving frequency The influence of vector deflection angle is more significant. The control mechanism of jet vector is more complicated. The vector deflection angle is adjustable from 1.53 ° to 36.65 ° and the vector deflection angle appears two peaks. At the resonance frequency of the diaphragm, the vector deflection angle is the smallest .