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Mechanism of Impinging Tone Generation by Circular Jets

机译：循环喷射撞击音调的机制

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The mechanism of the impinging tone generation by circular jets has been studied experimentally in the full subsonic range of jet speed. It is found that the hole-tone is driven by the symmetrical instability at low-speed laminar jet, but the plate-tone as well as the hole-tone is driven by both the helical and the symmetrical mode at high- speed turbulent jet. The frequency of the tone is that for the shear layer instability at the nozzle exit or that attainable by a cascade of vortex pairing with increase of the impinging distance. When the distance is longer than one diameter the frequency decreases to the terminal value near the preferred frequency of the column mode instability, in the range 0.2< St_d<0.5, where Std is the Strouhal number defined by fd/Uj, f the frequency, d the jet diameter, and Uj the exit velocity.
机译：通过实验研究了圆形喷射的撞击音产生的机制，在射流的全亚源极范围内进行了实验研究。 发现孔音由低速层射流下的对称不稳定性驱动，但是在高速湍流射流下通过螺旋和对称模式驱动板色以及孔音。 音调的频率是对于喷嘴出口处的剪切层不稳定性，或者可以通过随着撞击距离的增加，通过涡旋配对的级联。 当距离长于一个直径时，频率会减小到列模式不稳定性的优选频率附近的终端值，在0.2

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