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首页> 外文期刊>Journal of visualization >Intermittent round jet controlled by lateral pulse-modulated synthetic jets
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Intermittent round jet controlled by lateral pulse-modulated synthetic jets

机译：由横向脉冲调制的合成喷射控制的间歇圆射流

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摘要

A round air jet was actively controlled by a pair of lateral control jets. The control jets were generated by a pair of opposing synthetic jet actuators, which were driven by the pulse-modulated sinusoidal signal. Two carrier frequencies were tested, namely 160Hz and 840Hz. Moreover, control jets driven by un-modulated sinusoidal signals were also tested. An unforced continuous jet was used as the reference case, and for all cases, the Reynolds number of the main round jet was 1570 (related to the nozzle exit diameter of 10mm). Experiments (flow visualization and hot-wire anemometry) revealed that the flow control caused a suppression of the jet core and a more rapid jet flow decay. In addition, the pulse modulation caused jet intermittency that was distinguished by the periodicity of the time-averaged and fluctuating velocity components. For the case of the lower carrier frequency of 160Hz, a flapping motion of the controlled jet occurred and the jet formed a zigzag pattern.
机译：通过一对横向控制喷射器主动控制圆形空气射流。通过由脉冲调制正弦信号驱动的一对相对的合成射流致动器产生控制射流。测试了两个载波频率，即160Hz和840Hz。此外，还测试了由未调制的正弦信号驱动的控制射流。使用未加工的连续喷射作为参考案例，并且对于所有情况，主圆射流的雷诺数为1570（与喷嘴出口直径为10mm）。实验（流量可视化和热线风速度）显示流量控制导致抑制射流和更快速的射流衰减。另外，脉冲调制引起了通过时间平均和波动速度分量的周期性区分的喷射间隔。对于160Hz的较低载波频率的情况，发生了受控射流的拍打运动并且射流形成了曲折图案。

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