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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Experimental study of small supersonic circular jets actuated by a cavity
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Experimental study of small supersonic circular jets actuated by a cavity

机译：小超声圆形射流通过腔致动的实验研究

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摘要

The characteristics of small supersonic circular jets actuated by a cylindrical cavity are investigated experimentally. The jets are discharged through two orifices located at both ends of the cavity. The diameters of the upstream and downstream orifices are 1.0 min and 1.4 mm, respectively, and the cavity diameter is 6.0 mm. The cavity length is adjustable and can be varied between 10 mm and 7.0 mm. The ratio of the upstream stagnation pressure to the backpressure ranges between 4.0 and 6.0. In the experiments, the jets are visualized using the schlieren method and a high-speed camera, and the pressure oscillations induced by the cavity are measured using a semiconductor-type pressure transducer. The experimental results show that the present small jets oscillate with sharp spectral peaks at several tens of kilohertz when the cavity length ranges between 4.5 mm and 7.0 mm. However, a previous study reported that no sharp spectral peak appears for small jets issuing from the flow passage in which the tones called "hole tone" should have been generated. The results also reveal that two primary oscillation modes appear: in one mode, the oscillation frequency is independent of the cavity length and in the other mode, the frequency decreases with the cavity length. In both modes, the frequency is independent of the pressure ratio. The schlieren visualizations clarify that the jets oscillate axisymmetrically and asymmetrically for the former and latter modes, respectively. This implies that if jets are used as actuators to control flow, either of the two modes can be selected according to a type of the controlled flow by just adjusting the cavity length.
机译：通过实验研究由圆柱形腔致动的小型超声循环射流的特性。喷射器通过位于腔的两端的两个孔排出。上游和下游孔的直径分别为1.0分钟，分别为1.4毫米，腔直径为6.0毫米。腔长可调，可以在10mm和7.0mm之间变化。上游停滞压力与背压的比率范围为4.0和6.0。在实验中，使用Schlieren方法和高速相机可视化喷射，并且使用半导体型压力传感器测量由腔引起的压力振荡。实验结果表明，当腔体长度范围在4.5mm和7.0mm之间时，本小喷射用尖锐光谱峰值以几十千赫兹振荡。然而，先前的研究报告说，从流动通道发出的小型喷射器没有出现尖锐的光谱峰值，其中应该产生称为“孔音”的音调。结果还揭示了两个主振荡模式出现：在一种模式中，振荡频率与空腔长度和其他模式无关，频率随腔长度而减小。在这两种模式中，频率与压力比无关。 Schlieren可视化分别阐明了喷气机分别为前者和后一种模式振荡轴对称和不对称。这意味着，如果使用喷射器作为致动器来控制流动，则可以通过仅调整空腔长度来根据受控流的类型选择两种模式中的任何一种。

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